Yaesu FT 757 GX II User 757GXII Manual

User Manual: Pdf YAESU--FT-757GXII-User-Manual

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FT.757GX ]I

HF ALL MODE

COMPUTER

AIDED

TRANSCEIVER

GENERAL DESCRIPTION

The FT-7s7GXII combines the finest features of its famous predecessor, the FT_

?57GX, with new developments in response to technological advances and to the

most popular requests from serìous

hf operators.

New advances

in djgj!al

con

trol and computer-aided

manufacturìng

methods aÌlow the FT-757GXIl to offer

great versatility and operator convenience

on all modes and all hf amateur

radio bands, with 100 watts of PEP transmitter power oùtput on the amateur

bands, and general coverage reception from 0.15 to 30 MHz.

Special new digital

features

include operator selectable

mode-dependent

tunìng

steps, ten memory channels which store mode as well as fÎequency, auto-resume

loop scanning between

dual VFOs (or adjacent memories), a special clarìiier

memory, and an improved CAT (Computer Aided Transceiver) System for simplified

programming aùd more advanced control by an external computer.

A 40dB IF Notch filter is provided along wiih continuously adjustabÌe lF Shift

for minimizing

interference during

SSB,

CW and ECSS reception

of AM signals.

wídeband AM and narrowband CW IF filters are included as standard. A switch-

able RF amplifier and

20dB attenuator are provided

to optimize

sensitivity

and

dynamic

range

on all frequencies

under a wide variety of condjtions,

while the

noíse blanking

pulse

width can be set on the front panel, continuously

adjust

able from narrow (ignition-type)

to wide ("woodpecker")

blanking

pulse

widths.

Full break-in QSK CW operation is provided {'ith Yaesurs custorn designed elec-

tronic keyer built in, as a standard feature. l\ew high voltage solid state

transmit/receive svritching circuitry is provided for direct t/r control of a

wide variety of QSK and non-QSK linea. amplifìers.

I

SSB

and

AM signal

punch can be increased

by the AF speech

processor'

which

combines

clipping

and compressìon

circuitry to optimize

average

speecll

power

\ir'ith minimurn distortion. Careful fillering before úodulation assures clean

output with a substantial

increase

in average

power' The diecast

top half of

the FT-757GXll serves as the heatsink for the final power amplifier' and

forced-air cooling through the chassis allows full power FM and AFSK operation

when used with a heavy duty power supply'

Optional accessories

include your choice-

of the lvlD

lB8 Desktop Scanning

Mìcrophone or the MH_188 Handy Scanning

Microphone' and the microprocessor

controlled

FC-75?AT 100-watt

Automatic

Antenna

Tuner or FL-7000 500-watt

Automatic Solid State QSK Linear Amplifier, each of whlch autornatically

selects

and tunes up to five antennas

when used with the FAS-1 4R Remote

Antenna

Selector'

Power supplies

for the FT-757GXIÌ include the FP-757HD Heavy Duty Series-

ReguÌator

Power Suppiy with forced-air cooling and automatic thermal fan control' or the

light-duty FP-700 standard supply, ìdeal when the transceiver ìs used as an exclter

for the FL-7000, or for low power and ]i8ht duty applications.

AÌl power supplies

can be wired îor l)o/ll1/117/200/220

or 231 vAC'

F'l'-757GXll Dùct Flo$ Cooling S''rslem

Fan fvloto. Shleld

Plate Loca Unit Chassls

2

SPECIFICATIONS

TRANSMITTER

l60m band i.5 to 1.99999

MHz

80m band 3.5 to 3.99999

MHz

40m band 7.0 to 7.49999 MHz

30m band 10.0 to 10,49999

MHz

20m band 14.0 to 14,49999

MHz

l?m band 18.0 to 18.49999

MHz

l5m band 21,0 to 21.49999

MHz

lzm band 24.5 ta 24,99999

MHz

l0ú band 28.0 to 29.99999 MHz

Tuning steps (selecrablel

SSB

& CW: 10 Hz or 1 kHzlstep

AM: I kHz or 10

kHzlstep

FM: 2.5 kHz or l0 kHz/step

Emission types

LSB, USB

(J3E)i

Cw (A1A); AM (AsE)

3Nd FM

(G3E)

SSB, CW & FM: 100W

PEPIDC, witl

sÌightly Less

on 10m band

AM: 25W Carrier

SSB Carrier suppression

betÈr than 40dB below peak ourplrl

Maximum FM deúanon

15

kHz

RF Output inpedance {nominall

50 ohms, unbalanced

Microphone impedarìce

500 to 600 ohms

RECEIVER

150 kHz to 29.99999 MHz (contjnuous)

Circuìt type

Triple-conversion superheterodyne

Clarifier range

unlimited (full receiver range)

Sensitivity (for iodB S+N/N, exc FM)

1s0-250kHz 250-s00kllz

è09!9

sookllz

SSB/CW l.0LrV 0.5uV 0.25uV

AM lùrv .1uV 1uV

FM: o.suv for 12dB SINAD

(above

500kHz)

Intemediate frequencies

47.060MH2, 8.2l5MHz,

455kHz

Unwanted sideband suppre.\sion (SSB) Image rejection

better than 50dB beÌow peak ourpul better lhan 70dB

(l kHz tone)

IF rejection

SpurÌous radiatioD beffèr rhàn 70dB {ali frequencies)

better than 50dB beÌow peak ouLpur

Selectivity { 6/ 6odB)

Audio response SSB, CW(W) & FSK 2.7/4.5 k{z

Less

rhan -6dB from 350 ro 2g00Hz CW(N) 600 Hzl1.3 kHz

AM 6/18 kHz

3rd order intermodùlation distortion FM 15/30 kHz

better than -35d8 beÌow peak outplrt

(@l.1MHz,

100!v) Dynamic range

(CW(N)

@l4MHz)

better tha. 100d8

Reference oscillator stability

betrer than 110ppm lrom 0 to ,10'C MaxinuÌn audio power ourpur

after l5 mìnute wa.mup at least 1.5W inro 4 ohms w/10o/' TllD

Modulation systems Audio output imp€dance

SSB/cw: active balanced

moduìator ,1

to 16 ohms

AM: earÌy stage (low Ìevel)

Fi\l: variable reacrance

3

GENERAL

Supply voltage

13.5

\DC !100/o

Pover @nsumption

Tramsitter (100W outpul)

Dimensions

(wHD)

238 x 93 x 238mm

{without

Weight (approx)

5.2 kg

(11.5

lb)

Supplied

DC Power Cord (w/o fuse)

Fuses (2 suppÌied)

FT TsTGXrr (20A)

FT-7s7SXIj (64)

3-pin Phone

pluC (SH3603)

RCA (phono)

pÌugs

(STP-58,

2 pcs)

Options

Model

MD IB8

MH-IBE

FRB 757

MMB 20

Part No.

Desktop Scannlng Mic.oPhone D1000039

Hand Scanning Microphone D1000040

Relay Control Box D3000280

l\'lobiìeMountlngBracket D6000032

External Computer ln|erfaces

2A

l9A

SpecifÌcalions may be subject to change with

out notice or oblì8ation.

ACCÉSSORIES

FIF 65A for APPIe tI

FIF-232C for RS 232C

FP-757HD Heavy Duty Power SUPPIY

fP /00 rtanda_d DrtY PoEè-

suPDì)

FC 757AT Automatic

Antenna

Tuner (100w)

FL 7000 500W QSK Automatic Linear Ampìifier

FAS 1 ,1R Remote

Anten.a Selector

(l.2kw,

lor use wìth FC 757AT or FL-7000)

SP-767 Base

Statlon LoudsPeaker

SP ?6?P Base Loudspeaker v/Phone Patch

SP-55 Mobrle Lotdspèafe.

E-?5711(CAT-N)

connecrion

Cable (to FlF 232C)

T9014900

Q0000009

Q0000012

P0090008

P0090018

F)F-232C

FC

-757

Ar

FRONT PANEL CONTROLS

L7 lq

{r) PowER

lhis pushbutton switch turns the lransceive.

o. and off. Frequency and rnode data stored in

rhe memories and vfos is not affecred by thjs

swirch, or by whether power is connecred ro

the transceiver, since this dara is retalned

by an internal lithium battery while the

backup system is activated.

(2) MlCrophone

This 8-pin co.nector accepts the plug of the

MD-188 Desktop Mic or MH-188 Hand MÌc.

Scanning controì lines from these microphones

alloiv pushbutton fast and slow tuning from the

microphone (dupljcatjng the functions of the

tuning knob and FAST button). See page l7 for

(3) PHONES

Monaural or stereo headphones with 4-t6 ohms

impedance may be connected to this jack.

Stereo headphones with a 3 conductor plug wÌll

reproduce the audio in both ears, as with mon-

auraÌ headphones with a 2-conductor plù9.

Inserting a pÌug ìnto this jack dìsables the

internaÌ or exlernaì loudspeaker.

(4) MIC/DRIVE

The inner MlCrophone control adjusts the gain

o. rh. -ur

'Tir .Jdio anp

itie- r5-d du

r 8

SSB and AM transmission {for FM, gain is

preset internally). This control adjrists

output power in SSB modes when the speech pro-

cessor is off, and modulation level in the AM

nodr. Ir is di hbt-d . en I F pro.ó.5of o

and during FM and CW transmission.

Th^ ort.r DRI\E '

olt o dú.rii. 'h" .arrie_

power outpùt level for CW, AM and FM rransmis-

sion. This control is disabled during SSB

{5) AFIRF ói ér \olrme.

lhe or Fr h .or

rrol dotu)1

. thc Sajn ol rl

c

receiver RF and IF anrpliliers via rhe agc

llne. This conlrol js normally set fully

clockwise tor peak .eceive. sensjtivity. When

it is set counterclockwise from maximum, the

S meter rìinimum deflection point will be moved

Lrp the scale, and weaker signals (or noisel

-5

(6) Tuning

Knob

This knob tunes

determined by the

by the FAST button:

and FAST butto.

!he transcelver at a fate

operati.g mode and selecled

wìll be suppressed,

although

S-meler defÌec-

rion for stronger signals will remai. rhe

same. This control also affects the squelch

threshold,

and so slould be set before

the SQL

(squelch)

co.troÌ.

'the outer noise blanker control adiusts the

decay time of the noise bÌanker agc, whrch

determìnes the wid.h of the bÌatking pulse

when the nojse blanker is activated durÌng SSB

and L

\\ -p.èpr

o 'a d \\4 q èr | .F 'o s Dllsps

are stronger than the received carrier).

{9) BAND/CH (D\{N & uP keys) and H/C button

DurÍng reception with a vfo, the two large D\\'l"l

and LIP keys are used to change frequency

bands, and for 500 kHz steps. The H/G (Ham/

GeneraÌ coverage band step selector) butto.

determines rhether the DWN & UP keys step

rhrough the amateur bands only, or in 500 kHz

general coverage steps. A beep sou.ds when any

of these a.e pfessed. See the Operation sec-

tìon of lhis mànual for detalls.

When receiving on a memory the H/G button is

disabled and the DWN & UP keys step through

the memories. Also, when the SCAN MODE swÌtch

is pressed, the DwN & UP keys activate and

oeJ ;\dr- pv\ ..

d.nirg o-ruF-r ìèîoric..

(10) MODE Seìect Burton and Indicators

Press rhis button to selecl the operating mode

while receìvjng

(a beep will sound). The sel-

ected mode js indicated by one ol the six LED

(r1) SCAN MODE Pushbunon Switch

Press this 2 posillo. swirch to select sca.-

ning facjlities. While depressed, the func

tions of Lhe DWN & UP keys and the VFO and

Memory keys a.e altered (from the basic

luncrjons described in this section) to select

and control various scanning functions, as

described in the Operarion section.

(12) vFo and Memory Keys

These six keys transfer frequency and mode

JarJ b-rq.p rlrF v-o. a d TeTo I \. A bèép

sounds when ore ls pressed. As they funcllon

during transmil as well as .eceive, use care

to avoid accidental changes whiìe rransmit-

ting. lwo keys have ),eLlo1v

markings lo indr-

cate that data wlll be overwrirlcn when !hey

àre pressed. some of rhese keys aiso take on

special functìons when the SCA\ NIODE switch ls

c,pè. èa. Tl

.

\F é-p la,flLaI dar.

VFO A/B

This key exchanges

rhc co.tents of the t{o

vfos

(called

A and Bl.

Tuning Rates Ín kllzlstep

MODE FAST ON FAST OFF

SSB/CW

AM

FM

1 kHz

l0 kHz

l0 kLIz

10

Hz

2.5 kllz

This knob is disabled when the LOCK button Ìs

pressed, durÌng transmÌssÌón or when operating

on a memory. A torque adjusmenL screw for úe

tuning knob is accessible through the hoÌe on

the bottom of the transceiver, just benealh

the knob (see

page

16).

(7) NOTCH/SHIFT

The inner NOTCH controÌ actlvates lhe IF notch

filre. when turned clockwise out of the click

stop, and tunes the notch across the IF pass

band. Its settjng is independen. of lhe oper-

ating freque.cy and IF Shift setting. Ser rhis

conrrol inro rhe clÌck stop (olf) when the

.orch fìlter is not needed. The norch fiìler

is disabled in the l_M mode.

The outer SHIFT conlrol seLs the position of

the receiver IF !assband

relatlve to the rece

iving frequency in SSB, CW and AM modes, to

suppress inrc.fe.ence o. neàrby chanrers. Al

the l2 o!clock posìtion the IF passband

is

centered on the (dÌsplayed) receiving ireque.

cy; tufn this control counlerclockwise lo

'o\^pr

rhp lf p1

òo-.d. or .,o(au!.é ro ra:\r

the passba.d. When no interference is prese.l,

set this conlroÌ to the l2 orclock position.

(8) SQL/NB (squeìch/Noise BÌanker)

The inner squeÌch control is used to se! lhe

rfrp.ho

d è\él or .r'on g srgn- nr roisa

at rhich recciver audio is muled. lhis

th.eshoÌd poi.t also serves as the scan stoP

setting when scanni.g. Clockwise rotation

Ìncreases

the rhreshold

level, causing the

| ,o r..p . d ,o b

'-l8ro I' d oisF o-

6

SPLIT

Press this key to activate split frequency

opera!ìon between the two vfos, and press il

again ro cancel sPlir oPeration.

MR/VFO

ThÌs key switches operation beLween the

last-used vfo and the last used memory. The

frequency and mode data in the vfo and mem

ory are unaffected. The disPlay indicales

which (vfo or nenlory) is currently selected.

VFOZ|.l

This key excharges the frequency and mode

contents of the last used vfo and lhe last

VFO>M

P.ess this key when oPeratÌng on a vfo to

srore the frequency and mode data from thal

vfo into the lasl used memory. This wilÌ

ov€rwrite previous memory data, and leave

the vfo and memory lhe same. This key is

ai.rbled $l.pr op^rd.inS

on à îemor\

M>VFO

Press this key when operaung

on a memorv

Lo

lransfer its dala into the lasl-used vfo.

This will overwrite prevìous vfo data, leav

irg r-è vlo dra nerru"y de '"np. A'èr Dre

-

sìng this key operation wiÌl be on the vfo.

(13) DLOCK

This button disables the tuning knob to pre

vent accidental frequency changes. "LOCK" is

shown on the display when active. Press this

buúon again to re enabìe tuninS.

(14) Meter & Dispray

The neier shows relacive signal slrength Ìn S-

units on the uppermost scaLe wnen recelvÌn8'

and either reLative power output (PO), trans_

mitter automatic level control (ALC) or

refrci

rèd pow-. pur

(s$Rì du g .-dn

ri"-

sion. The METER button on the lronr panel and

rhe FwD REV switch on lhe rear pLìnel serect

rhe meter functio. for rransmìssìon.

To the right of lhe meter the ON AIR iidicator

glows red when t.ansmìtting, a.d the cEN i.di_

caror glows Sreen when general coverage band

stepping is selected {via lhe rllG bltton).

LOCK - auning knob locked

SPLT - split frequency operation actlve

CLAR clarifier active

VFO A operatjng vfo, or

vFOB - or

MR - operation is on a memory

The digital frequency display indicates the

operating frequency with 100 Hz resolutÌon.

When operating on a memory, the memory channel

number (0 thru 9) is displayed wìth 'CH' Lo

the rlght of the frequency.

(15) CLAR

Press this butlon whlle recejving on a vio to

actjvate cla.ifier operarion. The luning knob

and D\4N & UP keys can lhen be used to lune the

receivef witho!t affecting the transmit fre-

quency. Press this button again to cancel the

change in receiver frequency and retur. to

r,vhere you were. The clarifìer is dÌsabled when

receiving on a memory.

{ 16) Pushbutton Svitches

Each of these swilches has two positions; when

depressed the ÌabelÌed function is on, and

when undepressed rhe labeLled function is off,

except for the NIETER swìtch descrjbed next.

MhThR "e è.

rs pr'hp ALC or potré- oL.p

rl

functions of the meter during transmrssron.

Power outpul lunctions (forward, or reverse)

are in turn selecred by the FWD REV switcb

on the rear panel. ALC is indicated whe.

this switch ìs i. the depressed posÌtion,

and power output when il ìs undepressed,

RF AMP activates the rf ampÌilier Ìn lhe

recelver front end when depressed, tor màx

imum receiver gain. ln the undepressed posi-

!lon the RF ampìifi€r is bl,!assed, for

increased immunity to overload l.om strong

signals on other frèquencies.

ATT pd's a 20dB

"nc','u ia l' -'.Fr!p

front end circult, to reduce sensitrvrry and

avoid overload of the rf anplilier and mìxer

when listening ro verl st.ong slgnals.

PROC acrìvates

the AF speech

processo.

to

increase average speech power during SSB

tfansmìssjon, according

to the level set by

the coNlP LE\JEL conrol on the rear panel.

NB/T actilates rhe noise blarker fbr SSB, CW

and ,à\l reception. The NB control at the

lower rìghr then be used ro set

the blanki.g pulse wÌdth.

At the left side of the operating frequency,

the display tube jncìudes

the foÌlowing Ìnd:-

7

AGC-F activates fast agc decay time for SSB,

(!r and AM rF.óprion. to fd' iliréLF

\.rnn; g

dr a rJring or lrsrerinS

ro \c') wédh

si8

naLs. When not depressed, slow agc decay is

provided for more comfortable recep!ion ol

strong s i8n a ls,

(17) MOX and VOX Pushbutton Swilches

The transmjtter can be manually switched on

and off by the MOX swirch. Tìris is useful for

SWR measurement and antenna tuning.

The VOX switch activates voice-actuated

$ansmit/receive switching, and serni break in

CW keying. In SSB, AM & FM modes, when this

switch is in the depressed positio., the

transmìtter wilÌ be activated just by speaking

into the micfophone. When finished speaking or

releasing the CW key {Ìn CW node), the recei-

ver wjll be automarically reactivated after a

short delay, as set by the DELAY control on

REAR

PANEL CONTROLS & CONNECTORS

ií. 11.

'.i: .!..'.41

.c_, €', ..91

'roì

Ll i?-ì

i9

{r) DC 13.5V

This 4-pi. connector accepts l2 to 15V DC at

l9 amperes

(transmit),

to power the transcei-

ver. Pinout is shown on page 13. CAUTION: AC

voltage or DC outside of this range may damage

the transceiver.

(2) BAND DATA

This 8 pin molex connector provides parallel

TTL-leve1 bandswitching signals (for rhe FC-

7574T Antenna Tunef), and also QsK conÍol

signaLs for the FL 7000 Lìnear Amplifier. See

the CAUTÌON .otice on page 14 ìl you wish to

use another model linear anplifier.

(3) LINEAR

This pushbutton switch activates e{rernai con-

troì of t/r sivirching by rhe FC-757AT, FL 7000

or other linear amplifier desìsned for QSK

operation. If not using o.e of these accesso-

ries, this switch mùst be in rhe undepressed

position for transmissìon. This srvitch atso

functions togerher wìtì the MARKER swrLcn ro

disable the memory backup, as described in rhe

Operation section.

(4) DELAY

This controÌ sers rhe delay between the time

that speech stops or the CW key is opened and

I

tktTE

a

the tirne that the receiver is reactivated when

the VOX system is activated by lhe swÌtch on

the front panel.

(5) ANTI TRIP

This controÌ sets the amount ol negalive

receiver audio feedback applied to the VOX

an1pLifier durìng VOX operarion. The level

should be set so that speaker audio does nol

key the transmitter,

(6) VOX GAIN

This control sets the gain of the VOX anpli-

fier for VOX operaLion. The optimum seLting

depends on the microphone used and the voice

characreristìcs of the operator.

(12) ANT Coaxial Jack

This type-M (SO-239) jack is for the antenna

system, antenna tuner or Ìinear amplÌfier

input. impedance requiremenl is 50 ohms' un

balanced. Use onìy a properLy

matÌng type-M

{PL 259) pìug and 50 or 52-ohm coaxial cable.

(I3) PATCH/AFSK

This phono jack accepts transmitter input from

a phonp pJr'h o- AF\K ronp

gererdror. lmDè-

dance is 600 ohms, and the ìevel should be

exrernalÌy adjusted to match rhat of the oper-

atorrs micropho.e, producing the same power

output wirh the same MIC gain control setting.

{

I4) FWD-REV

This switch selects meter indicatÌon of either

forward or reverse relàtive rt power ourput

during fansmission, when the METER swiLch on

the fronl paneì ìs ìn the depressed (PO)

positjon. Refer to the following description

of the FWD SET control, and the description ol

SwP nFa\u'èré r lé OpF-arior sp' io].

(15) FWD SET

Thìs potentìometer adjusts the sensitivity of

the metef for forward and reverse PO funcrions

during transmissìon. Adjust this conlrol for

full scale meter deflection ìvhile tra.smltting

a carrier wiah the FwD-REV swirch ser to rhe

FWD position, so that SWR can be read on the

meter in the REV positìon.

{

16) EXT ALC

This phono jack accepls transmìtter automatic

level control volaage from a linear ampljfier

lor l'F l dr ri -' Fr

p\ iP. Thr "pp i-d \oÌ -gP

should be be.leen 0 and -5V DC, referenced to

the outer contact (chassis ground).

(I7) AF OUT

This phono jack provides consta.t ìow-level

receiver audio, unaffected by rhe AF gaìn

control, for tape recording, digitaÌ demodula-

tors capable of hlgh impedance input or an

external audio amplifier. Oùtput level is ap

proxlmately 200mV peak ar 50 kllohms.

(18) EXT SP (Erternal Speaker)

'Ihis 1/8-ìnch 2-conductor mìni phone jack

provides ampÌifièd receiver output to drive an

external 4- to 16-ohn Ìoudspeaker.

(

l9) KEY

This ì inch 3-co.ductor phone jack accepts

(7) COMP LEVEL

This control sets the compression level of the

éucio

!pèe. .omprè\Lor arr. g sSB r:ì mr'

sion wlth lhe processor (PROC switch) on See

Lhe Operation section for adjustmena,

(8) AM CAR

This (recessed) trimmer potentiometer sets the

ratio of transmìtted carrler to modulatio. ior

AM rransmission. Adjuslmenl ls described in

the OperaLion sectìon.

(9) MARKER

Set this pushbutton switch to the dePressed

position to actìvate the 25kHz marker signal

generator, which produces a carrier at n1ultl

p.. ,r 2itH/ d' .. rlè l-Pqupn.\

'ìrg^ or

the receìver. When the callbration signaì is

not needed, this siritch should be olf (oul),

ovorc inr--fé.è

,.é { |lh norn- -'. F! io ,.

lhls swirch aìso functions in conjuncron wrth

the LINEAR switch to disabìe the memo.y backup

as described later.

(10) cAT

This 6 pin mini DIN jack provides access

to

rhe seriaÌ dara lines from rhe microcompuler

a4a A D ' orvp, -_, fo_ .4nrrol of rhc lrJ-\

ceìver from an external computer. See the CAT

sectio. of this maDual for details.

(ll) PTT Jack

This phono jack provides access to the PTT

line, for external .eceive/t.ansmiL control by

a lootswitch or other devlce. Connectlng the

inner contact to the outer contact (chassjs

ground) activares the transmitter. Maximurn

open circLrit voltage present is 13.5V, and

minimum cÌosed ci.cuit currenL is Lì.3 mA.

9

keyer paddles for rhe irternal electronic

keyer, or a straighr

CW key (when

the Ìnternal

keyer is switched off). Wjring connections are

shown on page

17. Open circuit vollage

is +sV

DC a.d closed circuit current is 0.5 mA.

CAUTION: None of the ùree KEY jack conracts

are connecled to chassìs

ground. DO NOT con-

nect the outer contact to chassis

grourd-

{20) RF OLIT

This phono jack provides low ievel RF oulpul

from an early stage of the transmitter, for

e)!clung a rfansverrer.

Poiver ìeveÌ ìs approxjmately

-6dBm (0.1

Vrms)

at 50 ohms.

{21} +8V

This phono jack provides 8V DC at up to 100mA

fof low power accessories.

The center contact

122) +rs.sv

This phono jack provides 13.5V DC at up to 500

mA for poweri.g accessories.

The cenrer con-

tacl is positive.

Note: Repairs to damage caused by exceeding

lhe current capabiììties of the accessory DC

jacks ("8V and +13.5V)

may .or be covered by

the warranry policy.

(23) GND

For best perfo.mance and safety, connecr this

terminal to a good earth ground through the

shortest path possib

le.

{I) BREAK.IN

Thls slide switch seÌects semi

in CW operation in conjunction

and VOX swìtches on the front

cated in .he folÌowing chart,

TOP COVER

(KEYING)

CONTROLS

'.2 rol

wìth lhe l\'1()x

{2) KEYER MAN/AUTO

When

this switch is set to Lhe AUTO position

llp in

èr1.' t bit - r.t I prn(é

.o I.

actìvated. Keyer manipulato. paddìes musr be

connected to the KEY jack on the rear faÌrcl ro

operate the keyer. Whe. a straìght key or bug

ls used, set this srvitch io rhe XlANual posi

(3) SPEED

'Ihis slide poleftionerer sers the keying speed

for rhe electronic ker-er when the KÈYER switch

ls ser to AUTaJ and lhe keyer paddÌes are

squeezed. Slìde this control to the right for

faster kcying.

11.

BRTAK IN VOX MOX ResuÌti.s functio.

SEl/II

SEMI

SE\fI

FULL

FULL

FULL

OFF OFF

OFF ON

ON OFF

oFF I ON

oN I oFF

Sidetone only (no L\)

Tx wheÍ keydown (no rx)

Seni break-in Cw

Full break in CW

Continuous carrler LÌ

Semi break-in CW

t0

INSTALLATION

PRELIMINARY INSPECTION

Upon opening the packing carton, inspect the

transceiver carefùlly for any signs of danage.

Check to ensure lhat all exposed controls and

switches move freely, and that the cabinet has

no dents or scratches. If you notice any dam-

age, document

it completely and contact the

shipping company ìrnmediarely. Save dìe packing

materials for possible futu.e use.

BASE STATION INSTALLATION

AC Power Supply

The FT-757GXIÌ requires a power

source of i2

to 15 volts DC, capable of up to 20 amperes on

voice peaks. For base station insrallations,

Yaesu offers a variety of AC power sÌrpplies,

alÌ of which rnay be used vith AC line voltages

of 100, 110, 117, 200, 220 or 234 VAC.

Ho$,ever, before connectiDg any power supply to

the transceiver or AC line, make certain that

the supply is properly ser up for the local

ljne voltage, and that the correct fuse in

instaued.

The FP-757HD is a heavy duty series regulator

power supply capable of 50% duty cycle opera-

tion with full po\r'er transmissions for up to

30 minutes at a tim€. Forced-ai. eooling is

provided over an extra large internal heat-

sink. The FP-757HD requires a 6-amp fuse for

100, 110 or 117 VAC, or a 3-amp fuse fo! 200,

220 or 234 VA.. Potrèr

lranqformer

primarJ

connections for lhe different line voltages

are shor/n on the next pa8e.

The FP-700 pover supply may be used for light

duty operation

with the FT-757GXII (CW, SSB

or

reduced-power FM and AM). AC voltages, fuse

reqìiirements and power transformer wiring are

the same as for the FP 757HD as described

above and shown in the diagram

on the nexr

page, but the plastic sleeve on rhe supply DC

cable must be cut to allo\r connecrion ro rhe

speaker in the power supply.

Make certain that the POWER switch on the

front panel of the FT-757GXÌI is OFF {out)

before connecling power to the tra.sceiver,

aDd doúbte check to make sure that the polar-

ity of the connections is correcr before swil-

chjng the transcelver on,

NE\ER CONNECT AC POWER, OR DC

15V, DIRECTLY TO THE FT 75?GXIt.

ffi

rr

tl-tf

f

t-

I

ll

FP.757HD

Equipment Location and GroÙnding

lf all base slation inslalLations, the GND

te rin un I ol rhP

r'

'n

'è \F_

should

be connected

bv a heavy braided cabÌe

to a good earth ground. Best perlornànce oo

all frequencles mav requÌre that the groundlng

cable be less ùan 10 leer (3 meters) long'

All station squipment shouid have ils own

grounding cable (jndepe.denr of signal or con-

troÌ cables), connected !o à conmon point on

the grounding bus, close Lo thc trans'eìver or

lÌnear anrpÌifier {if used). See the dragram

FP.757HD

POWER

TRANSFORMER

PNt[4ABY

CONNECTIONS

The FT-7;7GXII is designed for use wrth anv

antenna sysrem having a 50-ohm resistve rmpe-

dance a! the operatjng frequencv ArirÒmarlc

finaÌ protecrion (AFP) circuitfy is included

in !he transmitter to protect thc final tra's

istors by automaticallv reduci'g power outpur

when a. jmPedance misnatch (high SWR) is

present. \lith a. SNR ot 3:l Ior exarìple, onLl

about ?50/o of full poser outpur is avàilable.

Despile

this prolection,

the FT-757GXll should

never be swÌtched to transmit when no anrenna

or dummy load is connecred to the ANT jack'

Use so-ohm coaxiaL cabLe with a proper plug to

connecl !he lransceiver to the anrenna or

load, and if SWR is too high lo pe'miL the

desired performa.cc, connect an anlenna tuner

such as the automatic FC-757AT or the FC 700

betveen the transceiver a.d rhe anrennlì See

page 22 for SWR measurement wllh the FT

757GXll, dnd pages 11-16 for inter'Ónnection

Locare the transcerver

freeiy over the heatsink

!he case. Avold PÌacing

transcejver, and do not

on top of anorher heat

as a linear amPlilier.

so that air can flow

a.d u.def and behind

anylhing on top of Lhe

pÌace !he traùscelver

generatìng devìce such

12

MOBILE INSTALLATIOT{

(Negatìve Ground vehicles oniy)

The DC power cable for mobile instaÌlarion is

.uppÌiFd

$ L I F rransrptrer,

Pìéaqp

r,!irù

the NOTICE on page 11befo.e making power con

nections. The DC cable should be connected

directly to the vehicle battery, rather than

to the Ìgnition or accessory circuitry. Route

the cable as far away from ignition cables as

possible, and then cut off any exrra cable in

order to minimìze voltage drop losses

(3) Make sure the POWER srvitch on the trans-

ceiver is OFF, and connect rhe DC cable

TL P ni .o..,F be os

shows the plug pjn connections. The posi-

tive RED wire must includ€ a 20 amp luse,

instaìled in rhe supplied qable.

Always check to ensure that dìis srrirch is OFF

beiore startirg the engire.

(r)

\2)

Do nor .onnecr the L.ble ro t'e tra r5ce:-

\'r unr,r drrcr thF p_oDer conne. ior s

are made to the battery; the RED cable

lead to the POSITIVE battery termjnal,

and BLACK lead to the NEGATIVE terminal.

Make sure the battery terminal connec-

Lions are light, and remember !o check

rLrF1]

period..dl

) for ".9n" ol oo.- rirg

\4è,su

- rlè .olrdgè

Ji

,os. he bJr,èr)

termìnals with the e.gine running fast

e.ough to show a charge. ll above l5

volts, the aulomobile voìlage regulator

r u" bF "Jjus,Fd ru --Jr

,

p ha .ha-ging

voltage belore proceedìng,

FUSE Ratings: 20A for FT 757GXÌ1,

6A.or fT-7575\I

Mobile Antenna Installation

Please review the base station anrenna

information on the previous page. An antenna

tuner such as the FC 757AT is particularìy

desirable i. a mobile statlon, where the shorr

antenna elements have very narrow bandwidth.

Make sure rhat the shield of rhe snrenna coax

is fi.mÌy grounded to the car body ar rhe

antenna feedpoint.

Mounting

The optional MMB 20 Mobiìe Mounring Bracker

for the FT-757GXlI aÌìows

quick insertion

and

removal of the transceiver from rhe vehicle.

Complete instructions are provided wjth the

b.acket, which lr1ay

be installed eitter aDove

o. underneath the rransceiver (see phoro).

BLACK FUSE : 64

(FT-757SXIl )

20a

(Ff 757GXIl

)

BATfERY

TER]\4INALS

. F-r r:r BLAcr /;::::::r- a

'''__-_---

-Fì-t--.-----------_\\ - //-- \

J e' QED l\ -] - !! \:r- ) TLRI/INALS

u-

FUSE HOLDER

DC Power Cable Connections

lvlÀ48-20 Mobile À,lountlng

B.acker

t3

IN

TERCON N

ECT ION S

T

1l

Linear Amplifiers

The FT-757GXII includes a high voltage (1s0V)

rrdas:sror ,$ir.t .apable of handlirB Lp lo

1.5 amperes DC, to control transmit/receive

switching of a linear ampiifier via pin 6 of

the BAND DATA jack. However, make ceràrn that

the t/r switching requirements of your linear

amplifier do not exceed these limÌls, and that

the lìnear switching voltage is +DC, and not -

DC or AC. Yaesu offers the oplional FRB-757

Relay Box for l/r switching of linears that

require negative or AC switching, or higher

voltage or current srvitchÌng. The FRB-757 in-

stalls between the relay jack on !he amplÌfier

and the PTT jack on the transceìver, ancl rs

capable of switching uP to 250V AC or DC, at

up to 2.54.

If using the FC-757AT antenna tuner or a QSK

linear amplifier such as the Yaesu FL-?000 or

Alpha 78 connect pin 8 (INH, transmjrter inhi

bit) of the BAND DATA jack to the exciter

control llne from the linear, and set the

LINEAR switch to the ON (depressed) position

ro a t4$ rhe dns

nire|- a.t.raIor . r.urrrv

in the Linear Lo control the transceiver.

If using a non-QSK linear amplifier s'ch as

the Yaesu FL-21008, or most Henry or Heathkit

linears, make sure thal the LINEAR switch on

che rransceiver is oFF (outl.

:m.

r f|flfl

F f-757GXrl SX ll + FP-/5IHD

FT-I57GX II /SXN + FTV.7OO+

FP.757I]D

F*;_l

L =:Ì]

VFT 757GX]I

+ FL TO(](]

FT ?57GXN,/SXN f,!

FL-7000

i-

LINÉAR

T

8

È:

I

t

QSK

LINEAR

E

f,É

I

r- i--,

I

FRB-757

CIRCUIT DIAGRAM

-- g::

Belav controlvólrage

iiom rhe lnearamplilièr

mùsr be le$

rhan 50V,ónd

relay coi cutrenl le$ thao

300m,A.

!Í9

E1

PLNI, aMl

@

@

Ff 751GXn FP.757ND

9

-.,- -t,-

I

.r.",.T,\î:,'.,

_____l

t5

IEF

{EF

fltt--

{f,F

rc 757AT

FT-757GX

II ,iSX]i + FAS I 4R

+ FC.75IAT

Torque Adjustme.t Sdew

FI 757GXN SXN

BOTTOM

l6

fvlH-

f Bs

rvltcRoPHoNEs

MD. EA

PLUG CONNECTIONS

, f----_-.-

------{4

L'I T

Externa keyer P ug

::rrlneq-,rt

.-'rffiiÉn!

a___o

:r''''''É .hI ), -t

'DF= N0 v -

ù*L

*-,,,@,+

C..-..-O

[4o.aura Headphone Pl!g

qrì%.p

a--.-ì

-llnn , Center Conducto.

--llll1Ì:à-È

._--

ar

cND

12)

s. ou_f

it s. rN

(4-ì

PÌr

l5_iì

AGc

oNC

Ste.eo Headphóne

P ug

17

caT(Mn D N)

Pug

OPERATION

Before plugging

lhe power supply inro the walì

outlet (in base installation), ensure rhat !he

power supply is wired for your AC line vol-

tage. Make certain thar rhe proper fuse 1s

instaìled, and that ir is p.ope.Ìy connecred

to the transceiver as described in the lnstal

lation sectio.. Also nake sure the antenna a.d

ground are connected. Refef to Lhe Memory

Backup informatìor below to enabie the backup.

Connect a microphone, if desired, ro the trllC

jack. See page 17 for microphone informatìon.

For CW operation, co.necr ke)ref paddles or a

Cw key as shown on page

17 to the KEY jack on

Preser the POIVER swirch off, and all push

buttons to lhe undepressed posìtìo.. Set dre

other controls as folÌows:

MIC flrlly counterclockwise

DRIVE - fuÌly cou.rerclockwise

AF - fulìy countercìockwise

RF - fuily clockwise

NOTCH - fully counterclockwise (lnto

rhe OFF cÌicksrop)

SHIFT - l2 orclock positìon

NB 12 orclock posjtìon.

Initial Poq,er Up and Tuning

V!. - |

rè . d r,c \lO\ ord VO\ bJflo 5 .ró I I

the u.depressed

(out) positions, and then

switch on the power suppiy, followed by the

fansceiver POWER swltch. lhe neter and dìs

play should Ìight, vith the display ìndicating

the default (memory clear) state: VFO A and

7.000.0. Also, the green GEN and yelÌow LSB

indicarors shouìd ljght (also defaults).

Press the MODE button (repeatedly, if neces-

sary) lo selecr the desÌred mode of emission.

Turn dre AF gajn conrrol clockwise for comfor-

tabÌe receiver voÌume. lf you do not have a

scanning microphone, qse the FAST buLton on

."F r or Pdl.l J.\ó .J ing

cr.po

(with the tuning knob), and then set the FASI'

Notice that both coarse and fìne tuning sreps

are mode dependent, as shown on page

6.

If

,or ".. è- \'D-l88 \4H-l88 dn r,g n -

rophone

rhe scan keys on the mìcrophone can

greatly faciìitate vfo tuning wìth rhe tuning

knob: operate .he tuning knob wilh one ha.d

"ì e l-Fp

g.ou o - h"rd

orrhè n.ro-

phone, FAST bLrtbn. This alLows qulck searching

fo d. r\ r-\ l " r'l ", fAqT b|.t.on 1 - ed

and then easl fine tuning when the FAST button

js reÌeased. To juÌnp up or dowi one coarse

slep, press the mìcrophone FAST and either UP

or DO\\N kcy logether.

NOTE: U.der certain condjtìons the tunlDg knob

ìs deac.ivated.

These are rhen the D LOCK

(dial lock), \,1R (memory recall) o. SCAN À,IODE

functio.s are active. When rhe dial is locked

or a memory has been

recaiÌed, iLOCKT

and rMR'

appear, respecrively, on the dlsplay, Press

the D LOCK buftor to deactivate Lhe dìal lock,

or press the MR/VFO button to return control

lo a vfo. If nelther of the above-lnentioned

conditions is dispìayed reset the SCAN lvlODE

button lo the u.depressed position to turn off

Press rhe H/G key and observe the steps of lhe

DwN and UP keys (the GEN indicator js olf lof

amateur ba.d steps)r and then press D\1N and UP

keys to select the operatìng band (for which

rhe antenna is resonanr).

The Ham/Gen (H/G) selection affects only the

stepping action of the DWN and UP keys when

tu.ìng a vlo. You c:i. use either selection lo

receive on any frequency, or to transmit in

!hc amareur bands. The transmitter is dlsabled

oulside of the 500 kHz amareur band segments

regardless of Ham/Gen selection.

Memory Backup

Betore leaving the factory the memory backùp

systen1 is turned olf. Actjvate the backrip by

settìng the N{ARKIR and LINEAR swìrches on the

rear panel to rheìr undepresscd

(off) posi

!ions. lf you are usi.g a QSK linear rhe

LINEAR slvitch Íìust be kept ìn the depressed

position, in vhich case onÌI the IUARKER svirch

reeds to be set ro off.

If you want to cÌear aìl nrenories, of if you

plan to srore the trrìnsceivef lor a long time

vithout po\!er con.ecred, dìsable rhe backup

system bv pressing borh the LINEAR and MARKER

swirches (to O\) rvlriie rhe transceiver is off.

t8

SSB Reception, Interference Reduction rarely be needed below l0 MHz, unless you have

a sll]all antenna or your sration is ìn a quiet

environmen!. Do not activate the attenuator

and RF Ai\{P at rhe same timet instead, swìtch

'l

he setti.gs described up to this point a.e

besL lor tLrning and receiving weak signals

under most conditlons, In most cases, once you

have runed in a starion, you eill vant Lo set

the AGC F off (out, slow agc) for most comfor-

iable listenlng. If you are working a strong

sration (consistently

above S-9), tur. on the

rhe atrenuator if ir isn't already on, or turn

off the RF AlvlP (if jt's on), and decrease rhe

Rl_ gaìf so thar his sigùal just moves the S

meter above its (raised) restìng

posìtion.

You

should.orice a reduclion in background noise

and more comfrìftable copy.

Whe. .etu.ing the vfo, set the AGC-F back on

(last), and return the RF and ATT ro rheir

prevìous

settings

(ìf you are liste.ing for

iF Shift & Notch Fllter

lf you expcrience interlefe.ce lrom stàtions

o' ,

urb/ f.aqua ìè "frFr rur.ng i| à

',aroI d,d -r.,,c L-, i

i-olr q u\l

described, .otare the SHIFT control to sup

press thc intcrference. Lrsuaìly, interference

o. one sjde of the desired sjgnaì is wofse

rl 'r

o ,-.hr. u,cb "hiÍr ng l-p,.

band rowa.d the cÌearer sjde reception ot Llìe

desired signal can be improved. Noricet

ho$ever, that the passband

ol thc desired

signal is also shifted, so tu..ing the SfllFT

control too faf may cut off too nuch of the

low or high aùdlo components and make the

signal u.i.telllgible.

Excepr for the vfo and memory conlrol keys,

'la remdrn.

g .u |lo fo \é rè éitP

provjded to reduce or eli|ninate Lhe v:tnous

types of noise, inrerference and distortlon

thar can obslruct comfortable receplion, Oper

ation is fjrst described for SSB (USB or LSB)

reception o. an amateur band, with varìalìons

for orher modes descfibed later.

Press the MODE button to select USB and tune

ro the 14, 21 or 28 À4Hz

phone

band (if your

antenna is for a band below 10 MHz, select

rhat band and rhe LSB mode). Aiso, set the

AGC F butto. for fast agc actìon (depressed).

Rl_ AMP & Attenuator

Careful adjusment ol !he receiver front end

is necessary for optìmum

reception, and shouÌd

be treated as first prioriLy al the starl of

an operating

session, or ehen changìn8

modes,

bands o. afte.nas. To ser up rhe receiver for

optimun sensitivityi first make sure the RF

gain conLrol ìs fuLly clockwise, and the rf

ampÌifier and att€nualor àre off (RF AMP and

ATT undepfessed).

On a cleaf frequency, check for any S meter

reading on the background nojse

Ìevel (hiss

or

crackÌe). if the S-meter deflects above 3,

turn on the attenùaror

(press

ATT). Otherwise,

if the background noise gives no defÌection,

rurn on the RF AMP and agai. norc the S_meter

reading or backgIou.d roìse: if it is above 3

S-units, turn the RF AMP back off (leaving

it

on r!ould :ncrease the S meler readings ol

received slgnals, but vould .ot improve the

signal-!o-noise ratio {redl sensitiviry), a.d

would increase the likeLìhood of overÌoad

from

strong sìgfaìs on other lrequencies.

After selecting the proper ATT and RF AMP

settlngs, if backgrou.d noise stiÌì causes the

S meter ro defÌect, note the Ìeveì and theD

rotate the RF_ gain conlrol counlercÌockwise

lrom maximum until the S meter deflectjon jusl

begi.s to increase slighlly àbove the noise

level. This rill reduce the back$ound noise

when you Ìisten lo slgnals,

ln generaÌ, Lhe atteDualor nay ofren be needed

on lrequencles belorv i0 MHz, and when you are

I

s g a la

8e )ou- \.ar.o. ò ir o

nolsy environment (ciry). îhe RF A\,lP should

The lf- notch lilt.r is prjmafily uselul for

Lpprp.

' I har-rodvr- ' .$ .., -aq< 'p.-!-

tion as described later. However, ir is also a

powefful tooi for suppressl.g odrer !y!es of

inra-tórè-i nD

r.- 8-,P-drpd

buzzing noise, in the SSB mode. Afler lunjng

in the desired sig.al and serting the SHIFT

lor opLlmLtm copl, if !ou a.e receiving

a buz-

zj.g type noìse, rurn rhe NOTCH on (our of the

click sto!), and {arch the S-meter while

'u-:r8 hó r. nr"ot

.or rrn n. n cé t.

-_

tion on.he noise (when rhe other starìon

| ,"t .. o ""u-

- r.r qamp.,.\-,q.,

can be used ro suppress interferìng CW signals

or carrier hererodynes

durjng SSB reception.

t9

SSB Recepfion, Interference Reduction

Excepr for the vfo and memory conrrot keys,

ilg "o

rrro

"

p.o!idad

o redu,F

or er m,'dé I'e \arioLr

types of noise, inre.ference and dìsro.tion

that ca. obstruct comfortable reception. Oper-

ation is firsr described for SSB (USB or LSB)

reception on an amaleur band, wirh varjations

for other modes desc.ibed later.

Press the ìVIODE

button ro selecr USb ano cune

to rhe 14, 2l or 28 MHz phone

band (if your

antenna 1s for a band beÌow 10 MHz, selecr

that band and rhe LSB mode). Atso, set the

AGC-F butron for fasr agc action fdepresseo,.

Ill_ AMP & Aftenuaror

Careful adjustment of rhe receiver f.onr end

is necessary for optimum receprjon, and shoutd

be treated as fi.sr pflority ar the sÈart of

an operating session! or when changing úodes,

Oands or anrennas, To set up rhe receiver for

optimum sensitlviiy, first make sure rhe RF

gain conarol is fÌrÌly clockwise, and rhe rl

amplifier a.d atrenuaror are off lRF AMp and

ATT undepressed).

O. a ciear freque.cy, check for any s-merer

feadirg on the backgrou.d

noise tevet (hiss

o.

cfackie). If the S-merer detlecrs above 3,

turn on lhe atLenuator

lpress

ATT). OÈherwjs€,

if dìe backgrou.d noise gjves .o deftection,

turn on the RF AMP and again note rhe S meter

reading on backgroLrnd

nojse: if i! is above 3

s-units, turn rhe RF AMP back off (teaving

ir

on s ud t "-d.. r-r Sî -. -noai

,8. ol

recejved signaÌs, but woutd not improve the

sig.al to-noise farjo (.eal se.sitiviryr, ano

would ìncrease

the Iikelitrood

ol overÌoad from

srrong srgnals

on other frequencies.

Atter selecrìng the proper ATT a.d RF AMp

settings, if background noise stiu causes rhe

S me.er to deflect, nore rhe level and rhen

roÈate the RF gain control counterclockwise

from naximum unrìl rhe S-merer defÌecùon lusl

begins to increase slighrly above the noise

level. This will reduce rhe back$ound Doise

when you lisren ro signals.

In gene.al, the artenuator ùay ofte. be needecl

on frequencies

below l0 Mllz, and ùher JUu are

usrng a ra.8e a.tenna or your starion is in a

norsy

envjronmen!

(city), The RF AMP should

rarely be needed below l0 MHz, unless you have

a smal anlenna or your starion is in a quiet

envìronmenr. Do not activate the arEenuaror

and RF AMP ar rhe same rìme; i.sread, switch

The seftings described up to this poinr are

best for tuning and receiving weak signais

u.der most conditjons. In mosa

cases, once you

have tuned in a station, you will wanr ro ser

the AGC F off {our, slow agc) ror most comfor_

tabìe listening. If you are working a srrong

sratio. (consisrendy

above S 9), turn on rhe

rhe atrenuator jf jt isn't already on, or rufn

off rhe RF AMP {if ir's on), and decrease the

RF gai. so that his signal just moves rhe S

meler above jts (raised) resrìng posltion. you

shouÌd notice a reducrion in background noise

and more comfortable copy.

When retuning rhe vfo, set rhe AGC-F back on

(fast), and rerurn rhe RF and ATT to theì.

preyious setrings (if you are listening for

lF Shift & Notch Fitrer

lf you experience inrerference from sralions

on nearby irequc.cies after tu.ing in a

sratìon and setring the rf conrroÌs as jusr

described, Ìotare rhe SHIFT controì ro sup

press the interference. usually, inrerrerence

o .1r .d- o. l,é dpsr- d .,grd, i. -.o-.-

rna. on the other, and by shìfting the pass-

band

toward thc clearcr side receptìon

ol rhe

desifed signal can be improved. Notice,

ho$ever, thar rhe passband of the desired

srgral js aìso shjfted, so rurni.g the SlltFT

conrrol roo far mey cur off roo much of the

Ìo$ or hlgh audio components and n]ake lhe

sìgnar uninreltigible.

Tàe lF norch fìlter js primarity usefut for

suppressrng heterodynes l. CW and ECSS reccp_

tron as described ìater, However, it ts also a

powerlul rooi for suppressl.g orher ry!es of

i.rerference, such as compurer generaLed

buzzing noise, in rhe SSB mode. After turjng

rn rhe desired sig.al and setrìng the S IFT

for optimum copy, if you are receivj.g a bur-

zj.g type noise, rurn the NOTCH or (our or tne

ciick srop), !ìnd

warch rhe S-meter whìte

runrng tne notch co.rroi for mhimum deflec

tion on the nojse (whe. rhe other statron

lsn't talking). Of course this same technique

can De used to suppress inrerferj.g C!V signats

or carne. heterodyres during ssB receptio..

Note: once the NOTCH has been set, adjùsting

the receìvÌng frequency or the SHIFT control

will move the notch setting, which will then

have to be readjusted.

Another powerful application of the IF notch

fllter is to effectively narrow the receiving

passband by tuning the notch near the high or

low edge. The result is illustrated in the

diagram below, First tune in the desired sig-

nal and adjust the SHIFT as described above.

Then turn on the NOTCH and adjust it to the

oppos

re pnd of ,he pasrbdnd f.or rhîr rrlei

ted by the SHIFT, for best noise rejec.ion and

receiving clarÌty.

only work if the expected signal is strong

enough to overcome the squelch threshold.

Othe.wise, when not scanning, the SQL conrrol

should be set flrlly counterclockwise.

Note: lvhenever using the squelch feature, make

sure to set up the RF AMP, ATT and RF gain as

described previously beîore adjusting the SQL

control, as the squelch th.eshold is affected

by these front end settings.

CW Reception

ln addition to the inlerference and noise

reduclng conlrols described for SSB, the FT-

T5TGXII

CW N (nar.ow) mode provjdes

a 600 Hz

'f fi r-r tr.p rhe cw tr

(wide) mode ro tune in the desired signal for

about an 700 Hz pìtch, and then press the MODE

button to select CW-N,

Keep the AGC-F switch in

position for CW reception,

gain as much as p.,sslble

rhe fast (depressed)

and reduce rhe RF

ro. suppress

DacK-

Remembe. to return the NOTCH control to its

off (clickstop) posjtjon, and the SHIFT con

t.oÌ to ìts center position when retunìng to

another frequency.

Pulse-rype nolse, ei!her shorr duration types

sucl as from iSnilions sysrems and electric

motors and switches, or lo.g du.ation over-

the-horizon

radar {rrwoodpeckerr')

signals,

can

b€ reduced or removed by pressing rhe NB

button and adjusting the NB control from coun-

terclockwise to clockwise just to the point

where lhe noise is removed. Rolating the NB

control too far may cause distorrio. of the

dèsrr"d .jCnal. or Inrarmodulal|or .l s ro-C

.

igr"ìs "'p prè\èn. I n<. b) frèquF

r. -\,

When noise blanking is not required the NB

button shouLd be in the off (out) position.

Squelch (AÌl mode)

When waitjng for a scheduled call on fairly

uncrowded band the squelch ca. be activated to

siÌence the receiver until the call. Just tu.e

to the scheduled frequency (or set the scan-

ner, as described ìater, to scan the desired

range), 3nd then tu.. the SQL conrrol unriì

the receiver 1s quiet. Of course this will

The CW W mode provides ùe same IF bandwidth

as for SSB, but wÌth a special internal audio

filter to reduce the audio bandwidth, allowing

you to hear sjgnals up to about I kHz away

while tuning around the band. Noise and inter-

ference are $eater than for CW-N, DuL rne

wider bandwidth makes tu.ing easier.

The NOTCH liiter is useful in borh wide and

narrow CW modes to suppress a stronger nearby

CW signal ìn o.der to hear a weaker one, Jus!

turr the NOTCH control to set the norch on rhe

undesired signal. This shouÌd be done both by

ear and by observing the S-meter for a dip.

Hint: when you make contact with anolher sta-

tjon on CW, press the D LOCK button .o avoro

accidental frequency change.

20

I

AM Reception

iF l-7s7(;\lI

i ,l,

das a 6 lH, iì,"r .or

good

fidelity during reception of medium-,rnd

shortwave AM broadcasts. The NOTCH filter ìs

LsèfJl or èl

ninarinB

.d F- arórodJ

.ó.

r\\iis lesl p_od'l.rd whpt rwo sralto

's aré

transmittìng near the same frequency, but when

not needed, ir should be switched ofl for besL

fldeLity. The SHIFT co.tÌol is ìess effecrlve

than in the narrower nodes, but ìr is useful

for eliminating hìgh-pilch hiss and herero-

dynes from sradons more than 3 kHz away.

When interference or noise is severe, ECSS

lfré rpd adn tFr \él-.taD F siacood

ro rp.ep

tion may be preterabìe for recejving AM

signals. This special technique allows you to

seÌect either the upper or lower sideband

ol

an AM signal; eljmi.ati.g inrerference thar

may be present on the other sideband dLre

ro a

nearby signal. k also provides grealer selec

tivity resuLting i. grearer sensirlvity :rnd

SHIFT control effecriveness, but does not

provide as much fidelity for stfong signals as

To use the ECSS techniquc, first rune in the

starion precisely (shortwave broadcasters gen

eralÌy transmit

on precìs€

rnultiples of 5 kllz)

usìng the AM mode, and rhen select eìther L,SB

or LSB, whicheve. gives besr feceprio..

Now carefully fine tuoe for zero beat o. the

received carrier. To hear the carrier, set the

SHIFT control a1Ì the way in the dìrecrion

lhar gives emphasis to birss, and very slowly

lu.e for the point where the signaÌ sounds

most na!uraL and undisrorred, with no accom-

Panying whis!le or dìsso.:rnce.

When

you have tuned to zero bear, return the

SHIFT control to center (or adjusr for ml.imum

interfe.ence and the desired tone), and push D

Lco( o.o.do'. lo"s",f, ,qu" ",.

H -r: Tqro bFarrrS "ì c\"1 "ign"l '( \\ r-..p

tio. requires a very carefuÌ rouch on rhe

run. g l r 'b. qon orac .p $ In r. roe òr8-

nals fìrsr will make tu.ing the weak ones

easier. Coarse tunirìg cannot be used for ECSS.

When receiving AM signals in either ANi or ECSS

mode, the noise bÌanker should be off unless

it is reaily needed. Irs eflecrìveness will

vary depending on the signal strengrh of rhe

received signal and those on adjacent chan-

nels; beìng most effective when rhe signals

dré úFak

a-d roisa

pu

!F. -rp \r-o48.

FM Receition

The FT-757cXll ìs equipped

for FM operadon

wrthour addilionai accessories.

However, FM is

gene.ally not used on frequenci€s

below 29 MHz,

so a VHF or UHF r.arsverrer may be used to

extend the range of tlìe FT-757GXII ro rhe amareur

bands abovc 30 MHz.

The SHIFT, NOTCH, Noise Blanker and AcC con-

trols are nor active in FM reception. However,

rhe RF AMP, RF gain, ATT and SQL setrjngs are

especially imporlant. For weak sig.aì work,

set the SQL conrrol only after rhe other con-

troLs have been set. The FT-757GXI] FM cir-

cuitry ìs designed for !5 kllz deviation, as is

mosr common l. 2-way FM comnunicatlons.

RTTY and Packet Reception

An external TU (termlnal unjt) or TNC (termi

nat .ode controiler) is required for R'ITY or

packet operation, fespectlvely. Receiver audio

ls best obtained from the AF OUT jack on rhe

rear panel, as the ìevel of the slgnal ar rhis

jack is not affected by the AF gain control.

llowever, your TU or TNC musr be capable of

high impedance input (200mvp-p @50-kjìolrms)

ro

use this sig.al. Otheririse, Ìow iÌnpedance our-

prlt is available from rhe EXT SP jackJ but

rl.. r" ,f

è.

rFo by F ^f g-rn on. .r, aro

L ig r i _.r di

.dblp,

rhé 'r- é \prrLc",

The SHIFT conrrol ìs especìally convenienr for

RTTY and hf pàcket operarìon, using the SSB

modes (generally LSB is used for anareur digi-

tal modes below 29 MHz). Ser rhe SH1FT conrrot

so that lsk rones are centered in the pass-

band

(the center posirion is 1500 lt2)

As for SSB, the NOTCH fiÌter may be adjusred

ro suppress an unwanred carfrer, or ro narrow

the passband af.er the SHIFT control has been

set. Thc agc should be fast (AGC F dep.essed),

and the noise blanker may be left on ar a

moderale

setting

(abour

10 or 11 orcÌock).

L

TRAI.ISMITTER OPERATION

The solÌd state rransmitter in the FT 757GXll

rèqu rès '4 rd-u"rme I ol F|hrr .érr'.g

r'è

desired output level. The maximum poríer outPul

is determined by the mode and the capabiÌìly

of the power supply (in AM, FM and alsk, power

may have to be restricLed to avoid overheating

the power supply]. Also, there are certain

precaurions ro be observed at 3lÌ Èimes when

transmÌtring to avoìd possible damage to the

t.ansceiver, and to assure a clean signal.

Never transmit withouL having a dummy load or

anrenna tuned to the operatlng frequency

connected to the transceiver (or linear ampli

fier, if used). If you have any doubl of the

suitability of a pa.ticuÌar antenna on a cer-

rain frequency, check the swR (standìng wave

Ratio) first, as described below.

q!oid r dngi

o trpqLp rc c ''.rg rran5m's\ o-.

First return to receive, tune to the new

transmit frequency, and listen for at least a

mi.ute or two to make sure Ìt is not already

occupìedi or ask if the frequency is occupied

and then listen for a response, When using a

lighl- or medium duly power supply such as the

FP-700, do not attempt to lransúit FM, AM or

fsk at full output power. Although Lhe trans-

ceiver is capable of this, some power suppltes

are not, and they may rapìdÌy overheat a.d be

seriously damaged. In any mode, feel Lhe

supply occasionalÌy !ìnd reduce power or slop

transmitting for a while iî it feels hot.

Never begin to transmit (except into a dummy

load) without first listenÌng for a few m,n-

utes to make su.e the frequency is clear, and

then transmit your callsign. This wiLl avoid

accidental interference co other stations'

SWR Checking & Measuring

Before transn1itting, the SWR of the anrenna

.)qrer

ònoulc oè

'

hó.Ppd èr lfÈ opF"drrng

l-_-

quency to ensure that the proPer impedance is

being presenled to the transmitter. The trans_

mitter includes protection circuits that will

automatically reduce the output Power if SWR

is hlgh. For example,

with an SWR of 3:1 only

about 75olo of full power ìs available,

If using the FC-?5?AT Automadc Antenna Tuner

or FL 7000 Linea. Amplifier, SWR ìs calcuÌated

and displayed automatically, and rhe foÌlowing

procedures are not necessary. ln this case,

keep the METER swltch on *ìe FT-7s7GXll in the

ALC (undepressed)

posilion. See the Tuner or

{Tpl I'e rirual o- .omplèrè

deta.ìò.

Keyjng

the Transmitter

Use

the MOX button to activate

rhe rransmirter

du' ng rhé follos

n8

pro.èdurè

. BF

orè bFgil

nin& s€r the BREAK lN swirch on rhe top panel

to FULL, and the VOX button on the front panel

to off (out). To tra.smiL, seÈ the MOX bìrtron

.o rha aeDrFc.co po\irion.

dnd ttF- prprs I

again to .eceive (undepressed position).

SWRChecking

This procedure checks the approximate SWR

using jùst a few (arrs, ro avojd inte.le.ence

ard srrain on rhe equipment when SWR is ùn-

knosn, such as on a new a.renna.

On the rear panel, set the FWD-REV sLide

switch ro the FWD position, and turn the

FWD SET control lully clockwise (as viewecl

Make sure the DRIVE control ìs ser fully

counterclockwise. Set the METER switch to

the PO (depressed) posilion, and seiect

Tune the vfo to a clear frequency, and

listen for a minute to make sure its ciear

before proceeding.

Press rhe MoX button (the red oN AIR

indicator will light), and ve.y gradually

advance the DRÌVE controÌ whiÌe wàtching

the meter for any detlection. Now adjust

rhe DRIVE LonrroL io llar rì

. îè èr dé

flecls exactly to the SET marker (white

line cufting the red bar at the rÌght side

of rhe swR meter scale).

Set the MOX switch back off (our). Reach

back around to the rear paneÌ, and move

rrè fr^D-R \ ' id. .i r.i' o | - IrtV po.i

tion. Now press the NlOX swìtch again to

key the transmìtref, and note the SWR

approrimatìo. on the bottom scale of the

meter. Press the MOX switch again lo

return ro receivel

(r)

12)

(4)

(5)

(3)

It the SWR indicàtion was above 3, the antenna

syslem is too far fron resonance to be used at

the test frequency v'ithout substanlially

degraded

performance (not recommended). SwR

22

indicarion close to 3 indicates a poor antenna

match at this frequency, but an antenna luner

such as the FC-7574T may be used to match the

anrenna better, .educing the swR. of course

rh

s w

ll not c d rgó hó radiari

,g qudlrt.p.

of rhe antenna itself, and will require retun_

irg wnèrFrer 'hè rrd-\m ing frpqLe

.\ iò

changed, so it ìs better !o correcl the anlen

na or feedline mÌsmatch firsl, Ìf PossÌble.

SWR indications of 1.5 or less lndrcales a

matched antenna for use at the test frequency.

SWR Measuring

Use full power to measure SWR nore preclselv:

(l) set rhe FwD SET control on the rear psner

to midrange, and set the FWD REV swirch to

FWD. use the CW W mode and MOX but1ion

as

above for lhe following sleps.

(2) Set the METER se'itch to ALC (olrt).

(3) Make sure ùe frequency is clear' and Úen

press the MOX button and advance lhe DRIVE

untÌl lhe meter jusa begins to deflect,

(4) Press the NIETER svitch to PO (in).

{5) Whlle still transmifting, carefullv reach

around to the rear Paneì and adjust lhe

FWD SET controì fo. fulì scale dellection

ro the 5ti mdrk on tfe merer.

(6) Move the FWD-REV switch to REv, and note

ùe SWR reading on the bottom scale of the

merer. set the Mox button off (oull.

Again, ìf the SWR is above 3, a change in the

i -e'on 1 a_o

Power Meter Calibration

The meter may be calibrated using the ClV node

to indicate approxìmate transmitter RF ourput

powe. in eatts as follows. lhis is necessary

for prope. tra.smitter adjustment for AM, FM

and RTTY or packeL transmission, and is help_

ful for reduced power operation in olher

modes. lf using the FC-7574T Antenna Tuner

this procedure is nor necessary, ds the ìrC-

757AT includes a wattmeter and dmrìy load,

Before beginnin& measure the SWR as described

above and make sure the antenna is properìy

matched, or connect a 50-ohm dummy load.

With the MOX swìtch off, select the CW-W

node, ser the METER svilch lo PO (Ìn), and

sè. rhé DR.vr '

orr'ol fJl

) .lo wse

(maximum). On the rear panel, set the FwD-

REV switch to FWD.

Check that the frequency ìs clear, then

press the MOX button and carefully adjusr

the FWD SET control on the rear panei so

that the meter indicates 100W or rhe PO

(center) scale. Return the MoX button to

(1)

12J

The accuracy of this calibration is very

rough, as the actual fulì power output depends

on the band of operation and the antenna SWR.

If you have an accurate wattmeler and 50-ohm

dumdy load, you can use these in lhe above

procedure. Set the DRI\E contro] for l00W out-

put before adjusting the FWD SET control.

SSB Transmission

Wilh a microphone connected to the MIC jack on

the front panel, ensure the folÌowing controls

are preset as indicated:

Mc.

ta \è F.ro Al

C rourì

!1l.

gar'ortro, . l2 o'clo"'

(inner krìob right of the MIC jack)

PROC sv rrch OFF

(out)

\o\ stir' I oFf loulì

MODE . select LSB or USB

Tune ro a valid tra!smitting frequencv (in lhe

To activate the transmile., cLose lhe PTT

switch on the lilcrophone, and watchiq the ALC

indÌcarion (blue scaìe) on lhe meter, adlust

the MIC gain conlrol so that the meter de-

flecrs within the ALC zone (heavy blue line on

!he scale) o. voìce peaks. ThÌs wiÌl resuÌt in

full power output: reduce the MIC gain to

Speech Processor

After setling the MIC 8ai. as above, press the

PROC switch to activate the processor- The

average ALC indicarion on the mere. will in

crease, but if the peak indication deflects

palr rné al. /onè. .cdu'

- rhè \4lC Cdr

r.

23

The COMP LEVEL contlol on the rear panel

adjusts the level of speech processor co'npres

sior, and is carefully set for optimum perfor-

mance at the factory. However, usÌng difÍerent

microphones or variations in voice prtch mav

make it desirable to readiust lhis control.

This can b€ done by monitorjng the transmitted

sigral on ar os,

i los(ope or èxrerlaì receivp-

and adjusting rhe COMP LEVEL control to the

point just below that at which distortion

appears on the signal. lf set beyond this

poinb, average porÀ'er

will still be increased,

bur disrorrio. will cause signal intelligibil

ity ro be decreased.

VOX (Voice

actuated T.ansmjl Switchingl

ln any of the voìce modes, you can use the VOX

system to automalically activate the transmit

ter rvhen you speak jnto the microphone. Pless

the VOX switch to activate VOX, a.d then

adjust rhe VOX conlrol on lhe rear panel so

that the transmitler actÌvates when you speak

r$.rho,

I pre5òi

g .hè

Pl s$i

. r o1

'rrè

Tr' a-

p on r. \4

'en

)o srop dlt.rg rrP

rr.nsi eivcr

should rerurn lo receive alter a slight delav.

The DELAY adjustment on the rear panel sets

the hang tjme for VOX switching trom transmit

lf the audio from the receiver lriggers the

VOX system, make the above adjustments wtth

rhe AF control set lor low voÌume. Then in-

crease the volume to the desired operaling

level and adjusl the ANTI-TRIP control on the

rear panel jusr to lhe point where receÌver

audio fron the speaker ceases to triP the VOX.

Clarifier (ReceÌver Orfset)

When receiving on a vfo, the CLAR butron can

be pressed to allow independent tuning and

mode charging of the receiver wùhout affec_

ting the transmit frequency (CLAR is dlsPlayed

to the left of the operating frequency). This

feature is useful it, after making contact

with anorher statior, his transmitter drìfts;

you can retune hÌs siSnal without changjng

yoLr oú

| rransn

r,ing lfèouFnc).

Al'o, .è

the range of the cla.ifier is unlimited, iL

can be used for spìit frequency operation.

While the clarÌfier is on the tuning knob and

mode seleclor affect only the receiver: the

rransmitting frequency and mode will remain

the same as before the clarifier was acti-

vated, and this frequency and mode will be

displayed rrhen transmilting.

The FT-?5?GXII incorporates a specialrclaîi-

fier menoryr, which alìows you to lisren on

the transmit frequency by swilching off the

clarjfier. As long as you donrt touch Lhe

tunÌng knobJ pressing CLAR again returns you

to rhe {offset) receive frequency,

When the contact is finished, remember to

switch off the clarifier so that lhe transmit

and receive frequencies and modes.,vill be re-

aljgned when yoù retune.

Cw Transmission

The FT 757GXIl offers bolh semi and ruìÌ

break in (QSK) operation for both simplex and

spliî-frequenct op€ratiotu Hose!er. QSK opera

rion musr nor be arrempred

shrle ù.r'; a

linear amplifier nor specificall! desianed lor

r, or aamaSè

ro thc ampllfier or rransceivel

may result. see page l{.

The FT 757GXll incÌudes an internal electronic

keyer, which can be used by connecting keyer

paddles to the KEY jrck. You can also use a

slraiSht key or an external eìecironic keyer,

in which cases the internal keyer must be

switched off (top panel KEYER switch to MAN).

Be careful not to shorL the outer contact of

the KEY jack to chassis ground.

s-r up rhè ollowrng Í_o

t pa pì .on, o \:

VOX switch oN (dPpressed)

METER switch ,., ALC (out)

DR\l 'o,trol lo.-

rr.F

(nd')

MODE switch . . , . . select CW-W or CW N

A1so, o. rhe top panel, set rhe KEYER switch

ro MAN initially. Close the key to activate

the tra.smltter, a.d adjust the DRIVE conlrol

so that the ALc meter jusr starts to deflect.

This se.ting provides full power output: after

making contacr with another station, reduce

power wlth the DRIVE control if you can wirh

our roosrng conracr.

You should be abLe to hear the sidetone from

tlre Ìoudspeaker (or headphones) when you close

'I P , èr.np .în .i, lilr,oe rhe

hole near the rear of the bottom cover) can be

adjusted for comfortable sidetone volume.

24

To ser the (internal) keyer speed or to prac-

rice sendjng CW, set the VOX switch off (out),

and the BREAK-IN switch to SEMI. Also set the

KEYER switch to AUTO if usirg keyer paddles.

Now, cìosìng

the key will generate the side-

tone buL no signal will be tfansmirted. Ad-

just the KEYER control for the desired speed,

AM Transmission

Because carrier power is only one fourth of

rhe totaL PEP of an AM slgnal, it must be

limired ro 25 watts or less when transmitting

lith the FT 757GXII. When rhe power Òf the

îodrlar,lB . apbard" is dddeo ro rhÈ

cd rier

nE'

-. ..r a Pl

P o-.p.r rs 100

wart

. dì-

though this does not show on the meter.

To adjusr rhe FT 7s7cxll for AM transmission,

first calibrate the PO meter as described on

pdgè h orupc '\rè--dr

$arlmerp..

(1) Preset the MIC gai. fully counterclock-

wise, and ser the METER switch lo PO.

For QSK transmlssÌon set the VOX switch OFF

(out) and BREAK IN to FULL.

For semi break-ln operation, as required wjth

sorìe linear ampÌifiers, set the VOX switch ON

{depressed) and BREAK-IN ro SEMI. The DELAY

control on the rear pareì adjusts the hang

time betwee. key up and receiver enable.

FM Transmission

For FM transÌ]]ission, just select the FM mode

ard close the PTT swltch to lransmit. The MIC

gain co.trol ls disabÌed for FNl, as the galn

or . è 'nrcroj

hor' 'rpl t.pr r: o_-sFr iì pr

naìly lor 5 kHz deviarion, and should require

no iurther adjustment. RF power outpul is

adjusted by the DRIVE conl.ol. Ior full power

output (using the FP 757HD porver supply),

adjusr the DRIVE so that the meter (set for

ALC) just deflec|s slightl).. When contact is

estabìished, reduce rhe DRIVE, (4)

t2)

(3)

Make sure the frequency is clear, and then

close the PTT swilch on the microphone and

advance the DRIVE for power output of 25

\ldt s or lers 0n Lhè .rdlsÎirlpd i ar- èr,

Set the METER swirch ro ALC (out), Speak

into the microphone and advance the MÌC

gaÌn control untjl slight movement of the

meter occurs on voice peaks. PEP outlul

is now 100 warts. Do not advance the MlC

gain further, or overmodulatìon (and dis-

roruonJ may resull.

Use the DRIVE control |o reduce power once

contacr has been established.

CAUTION

When the Fî-757GXII is used with the FP-

757HD power supply, full power Flvl, AM or

AFSK (RTTY) transmìssions must be ìimiled

ro 30 minutes maximuÌn,

The Al speech processor can be acrivated for

AM Lransmissions by pressing

the PROC button.

ì:lowever, if speech processing is necessary to

maintain conÈact, we recommend switchirg to an

SSB mode for higher efficie.cy.

The VOX systen and cìarifi€r controÌ can aÌso

be used for AM, as described for SSB.

The AM CAR control on the rear panel adjusts

.ìè ìudr d io p-r.è

r'àgF

Ìevel. This contlol is alìgned at the factory

to provide 100% modulatio. rlien the DRIVE

cont.ol is set for a carrief leveÌ of 25

rLF \4

4 g';r .on -n J .pL

ro

about the same !osjtion as required for full

power output i. SSB, For 100% modulation with

a lower carrÍer ìevel, the AM CAR cont.ol can

be readjusted with an osciÌloscope connected

to monitor the llf outpur.

To set the AìU CAR control fo. i0090 modulation

al fulÌ po\yer outpu!, use an RF voltmeter for

the following steps;

\4nè thè P-700

o, 4.1èr rgfr'drr)

supply is used, rransmi!ter power i. the

above modes must be iinìted ro 50 watts

at all tjmes, to avoÌd overhearing and

subseque.t damage to the suppìy.

Regardless of the power source or node,

we recommend reducing power lron the

maximum leveÌs mentioned above whenever

rransmitting for more than l0 minutes, or

if the ambienr air temperarure is very

hot or the power supply feels hot.

25

(1)

Connect rhe RF vollmeter

to jack J1023on

the RF Unit.

Select a CW mode, and note the vollmeter

reading with the !ransmifter keyeo

Return to receive, select the AM mode, key

the !ransmitter and wÌth no modulation'

adjust the AM CAR potentiometer for

exactly one half of the voltage that as

measured in the CW mode.

milt€d signal. SeÌecl LSB or USB mode' and set

t|e PROC switch oft.

The PTT jack on the rear panel mav be used lor

external transmit/receive control, of press

the VOX butlorì to al1ow auromatic transmlt-

/receive svitchirg (eilher full or semi break-

in may be used). Manual transmit/receive

control is aLso

possible with the MOX button.

Note that the dispÌayed frequency is the (sup-

pressed) carrier frequency, so vour actuaÌ

MARK and SPACE frequencies wiLl be displaced

fronl the display by the audio frequencÌes of

Use the MIC gain control to adjust power ouL-

put while transmltting: lor full power' sel

the l\'flC gain so rhat thc meter lsho\jng ALC)

dellec!s sÌigh!Ì1. Reduce po$er output br

lurning the \llC gain counrercìocli* ise Írom

fuÌl po$er and obser\ing pose. ou!put on the

PO meter (after caìib.atÍng

as described

pre-

\,lously), or on an externaL wartneter-

As mentioned

previously, the Fî-757GXll is capabLe

of fulL power AI-SK ùarsmission for linited periods

rvhen used wilh a heavy duty powef supply. Restrlcl

rransmissions

ro 30 minutes with !he FP 75?llD.

If using the FP 700, restrìcl RITY or packel power

output io 50 watrs maximum.

Howeler, ìf ihe àir

Lemperatue is high o. ar hìgh aÌtitudes, cooLing

eificiency is decreased and so power output should

be feduced accordinSÌy.

Also, it is a good Prac

tlce to back ofl on úe porver whe.ever maKr.g

a long transmission,

and even then supply tem

per.ìture shouLd

be closely monitored.

\ Lè r dnrrir';-t. rt r'r' '

ool " al

don't turn the POWER switch off unlil the set

has bad a few minutes to cool and the lan

\2)

(3)

Unless

usÌng

a heavy dutv power supplv' Keep

\ ì^fi, d4d .

loD ra rsffil'.rb

ùc power supply becomes

hot.

RTry, HF Packet & SSTV TransmissÍon

Transmission ot narrowband FSK (F1; RTTY' SSTV

an<1

BelÌ 103 HF packet) requires input of

equal ìeveÌ audio tones (AFSK) ar the 600 ohm

PATCH jack on the rear panel' Remove the

micfophone fron the MIC jack so thal extran-

eous sounds do not inlerfere $'iLh your trans-

26

MEMORY OPERATION

Ten nemo.y channels, nunbered 0 through I, are

available for storing operatÍng trequency aùd mode

of emission selected on a VFO. In addition there

are two VFOS denoted VFO A and VFO B and a

rcÌariller

memory', each of which hold boLh operaling

frequency and mode independently, giving a total

of l3 memories. Selection and manipulation of

the memories and VFOS is accomplished via the

six keypad keys at the upper' riSht corner of the

Note that rhe VFO>LI and M>VFO keys have yellow

markìng i. the notch on the keyfaces. This is

intended to caution tha! these keys

cause dara ro be overwritten (erasedl.

VFO A/B Selection

The operating

vfo is indlcared

by VFO A or VFO

B displayed to the left of the operaring frequency.

Each vfo holds an indepe.dent fiequency and node

ol rîi.s J . o \pla,

I tnF a.tnr-dlè

\fo. p-as lhF

VFO A/B ker.

VFO/Memory Selection

The MR/VFO key at the upper riSht selects be

rwee. memory and vfo operation. wheneve. this

key is pressed, the selecled vfo or memory and

its displàyed freqLrency

and indicated mode are

srored (except wirh tempo..rry memory modes,

descfibed beÌow), rvhlle operation shifts from vfb

to a memory channel, or vice ve.sa. The vfo or

memo.y channel rccalled is always the one that

was last used. (When a memory channeÌ ls sel

ected, rlvlRr appears to the left of lhe djsPlayed

frequency, and rCHr appears to the ri8ht, wìth

the channel nLmber be.eath it.)

Split Frequency Operation

The two vfos and the SPLiT key can be used for

splil frequency ope.ation as foìlows:

(l) Press VFO A/8, if necessary, to select

VFO B (displayed

at the left).

Now receiving is on VFO A, but wher the PTT

switch or key is closed, lransmission is on VFO

B. fo reverse rransmil and receive frequencies

(for example, to listen on lhe ùansmit frequency)l

just press VFO A/B.

An dtr.r.dl

\Ò frel,od ro opF-atF

\pti. ir ro Lrsè

one vfo and the clarifier, Ìnertioned previously

i. the SSB Transmission sectior, Tune the vfo to

lhe transmit frequency, lhen press CLAR and ítne

ro the receive freque.cy (and other mode, if re

To iisten on the transmil frequency, press CLAR

again, a.d then once more to retuÌ. to the receive

frequency (which is srored in a 'clarifier menory').

Note, however, that the cÌarifier memory is Ìost

if rhe írning knob moves while checking the transmit

Memory Storage

ThÌs procedure aìÌows storage of the vfo mode

and frequency into a memory channel;

(1) Set the VFO ro lhe frequency and mode

of emission to be slored.

(2) WhiLe receiving,

press MR/VFO to swjtch

lrom vfo to memories.

(3) Press the D\ryN/UP keys, if necessary,

to seLect an uùused memory clanneì

(default data is 7.000 MHz LSB Ìn all

(4) Press MR/VFO again to return to the

(a) Press SPLI

I

.

(5) Press VFO>M (lower center) to write

the data from the vfo to fte memory.

Note that the VFO>MR key overwrites (erases!)

the prevìos memory contents. Steps (2), (3) and

(4) are required onÌy to select the memory channel

rhar is Lo be written. If you already k.ow that

rhe lasl selecred memofy is free lo accept new

data, these steps can be skipped.

(2) Tu.e to ihe deslred transmit frequency

(3) Press VFO A/B to select VIrO A, and

tune to the desired .eceive lrequency

27

(1) Connect

the RF voltmeter

to jack J1023on

rhe RF U.it.

Select a CW mode' and note the voltmeter

reading with lhe transmitter keyed'

Return lo receive, select the AM mode' key

the tfansmitler and with no moduìation,

adjust the AM CAR potentiometer lor

exactly one half ol the voltage lhat was

measured Ìn the cw mode'

mitted signal. Select LSB or USB mode, and sel

the PROC switch off.

The PrT jack on lhe rear panel mav be Ùsed for

external transmit/.ecejve controì, or press

the VOX buúon to allow automatÌc !'ansmit

/receive swÌtching (either full or seni break-

ifl n1ay be used). Manùal transmil/recerve

conrrol is also possible wìth lhe MOX button'

Note that the disPLaved

frequencv is the (sup

pressed) carrÌer frequencv, so vour actuar

MARK and SPACE frequencies wtlL be displaced

from the display by lhe audio frequencies of

Use the MIC gain contfol to adjust power oul

put while transmittìng: for lull Power' set

the \,flc gain so thar the neter (showing ALC)

deflects slìghtly- Reduce power output bv

tLrrning the VIC gair counlerclockwise lrom

fuÌl pover and observì.g power outPÙr on the

PO meter (afrer calibraLing as described pre-

viously), or on an erternal wattmeter'

As mentioned

Previously,

lhe FT-757GXI] is capable

of full power AFSK ransmissìon

for Ìintrcd Periods

when used with a heavy dutv powef supplv ReslrÌc!

transmlssions

to 30 minutes with lhe FP-757HD'

lf usìng the FP 700, resrict RTTY or packet power

outpu! to 50 warts maxlmÙm. Hotever, if ùe ajr

temperature is high or aL high aÌurudes, coolLng

efficienc), is .lecreased and so power oulput sbould

be reduced accordirglv. Also' Ìt is a good prac

tice |o back off on the power rvhenever making

a long tr.ìnsmission, and even ùen supply rcn1

peratufe should

be closely monìtored

r\fter !ransmirti.g. il the cooling tan rs on,

don't tufn the PO\\'ER s\!itch off until the sel

has had a fe$ minutÈs

.o cooL and the tan

\2)

(3)

Unless

using

a heavy dutv power supplv, keep

lrdniTlJsiu rd òloD

rra

'ri t rg '

the power suPPlY becomes lioL

RTTY, HF Packet & SSTV Transmisslon

Transmission

of narrowband

FSK

{F1; RTn, SSTV

and Bell 103 HF packel) reqÙires input of

equal Level audio Lones

(AFSK) at the 600 ohn1

PATCH jack on the rear paneì RemÒve the

microphone from rhe l\4lc jack so that ex'ran

eous sounds do not interfere with vour trans-

26

Memory Recall

(l) Press MR/VFO to recall memories: the

dispÌay and mode indicators wilÌ change

to the last memory channel accessed.

While watching lhe displayed

channel

number

press the DWN and LrP keys to

select different memory channels.

be set for Èhe desired sensitiviry belore adjnsting

the SQL controÌ, as these will affect the squelch

I re S( \\ \4ODl rhe .canrinS

modes, durÌng which rhe VFO A/B and MR/VFO

keys adopl aìternate functions, as explained below.

The mode ol emissìon of s recalled memorv channel

may be changed temporarily by the MODE keys.

when another memory or vfo is selected, the tempo-

rary mode seÌection is cancelled. Changing rhe

fraquen'

) or hè srorèd

noaè 4f rhè

neror\ rèqtjreJ

restoring from a vfo.

Changing Memory Mode & Frequency

\2)

To change the data stored in a memory chan.el

it is rìecessary to shift Lhe data to a vfo where

it can be nanipulated.

(l) Press r\aR./VFO and the DWN/UP keys

to select ùe menory to be changed.

(2) Press MR/VFO agaln to return to lhe

vfo (either

A or B: data wilì not be Ìost).

(3) Press VFOZzM to exchange the vfo

and memory conren$.

(a) Now retune or change node as desired.

Memory Channel Scanning

To scan the 10 memory channels:

(1) Preset the SQL control |o the point

where background noise is just silen-

(2) Pr"., \aR/VIO ro rp.a rh, npmoria).

(31 Prèss

\Cq\ MODL. ara \.rR./VfO agdrn

to start me scanner.

Scan.ing will pause on any channel having a signal

strong enoùgh to open the squelch, ard will resu,'ne

again if lhe signal drops out. lvhile paused, if

)ou press MIVVFO a double beeP will sound and

operation wiÌÌ shift to úe neat higher_nlmLìered

To slop lhe scan.ef nanualÌy press MR/VFO or

the PTT switch morn€ntarily. Return the SCAN

MODE swirch to the off (ou, positlon to return

the vfo/memory keys to thejr sLandard functions.

Scanning Between Vfos

If you set up the vfos as scanring

limits,

you

.

an .,

dn aìì rr-quèr

ie in bè,bóér b) p éo\i

t

SCAN MODE and the. VFO A,/B while operating

on a vfo, Press FAST to select high-speed scanniù9.

Sca.ning wìÌì pause on a signal and resume if

the signal drops out (or manually, by turning the

SQL clock\rise). Pressing VFO A/B while paused

moves the ffequencr-'

one srep.

To r" ."1..

..op . r'g u'd .è rl-c

-,c,,a

vfo to .he displated f.eque.cy, press VFO A/B

o. the PTT ssitch morìentariÌy. To canceÌ scan-

nrng alrogethert retun SCAN MOIIE to the out

Programmable Memory Scanning (PMS)

The Pì\']S feature alÌows you to scan aÌl frequencjes

between úose stored in any two adjacent memory

channeìs. The starting freqùency and mode of

the scanner are determìned by the seìecrcd memofy

(s) Press VFOZM to exchange the vfo

and memory agaÍn, restoring the new

data from the vfo to memory, and orìginal

vfo data back from the memory to lhe

If operating on a memory a.d you don't care lo

preserve the vfo data, you can lusl press jvl>vFO

to copy the memory channel data to the lasL seìected

vfo, This leaves the memory data intact, bur

overwrites all data 1n the vfo and leaves operàLion

SCANNING

When the squelch control is adjusted to siÌence

the receìver, either the memorjes or a preselecred

"rèquen.)

-pgm-r, mév be ,c- r-d a,,on"', 4 ì/.

Signais that are srrong enough to open the squelch

wiLl haLt the scanner. Note that the RF AMP

and ATT swirches and the RF (gaìn) control must

28

channel. Slow and fast (x10) rates are selectable

as lor vio scanning, Which ever vfo was last selected

prior to activating PMS wÌll be changed by PMS

To use programmabìe memory scannjng;

ll) 5 or. rhè loue' ara pDF. \.dn ing

limjts in adjacent memories, and seÌect

the one you wànt to start at,

(2) Preser the SQL control to the point

(3) P.€ss SCAN MODE on, and the. press

the DWN key to scan b the next lower

numbered memory, or UP key to scan

to the nexl higher nmbered memory.

rPr wìll be displayed in place of ùe

memory channeÌ number, indicating that

rhe PMS system is now acLivated.

PMS scanning wìll pause automatically when the

squelch opens, or can be nanually halted by the

PTT switch or DWN/UP keys: the PMS function

remaìns

active (rP' stilt displayed).

Press DWN or

uP again to resume sca.ning.

When the SCAN MODE switch Ìs retuned to off

(oul), PMS scan.ing ìs cancelled and normal oper

ation resumes on the Last-selected vio, which will

be set to the frequency and mode last tùed during

VFO A/B SPLIT M R

/\/FO

Pfess while receivj.g on a vfo

io ùse the selected rlo ior

feceiving, aód the aì!ernare

vio ior transnirtinS.

P.ess whjÌe feceivi.[.. a !rì

to swirch to rhe !ÌîenaLc vfo,

Also, rvlren Scàr llode o., starts

scanning b.t$ecr vfos, and

stéts/s!ores

s.a.ned f.cquencies.

WhiÌe receivnrg, press to srvirch

oferadon betqeen vio and nem

ory. /\rso sra.|s/stops nenory

scannrng

du.ing

scaD

l\4Òde.

P.ess shilc .ecejvrng

ni er

cnange rto or nemorl coften$

!.ith rhose

of Ì.st seiecied ùcm

o.y o. vrì. Ch..ses operating

rlffir

rr'FO2:/M VFO>M M>VFO

rEE

P..ss while.eceivrnE

o. a !ao

to rv.rte conle.rs over last

se I ec ted nenory. Ope.ating

treqùe.c)

does not change.

P.ess

whil. receivr.g

on

a rnemory

ao wrire co.rents

o!e. Ìasl-

sele.ted vlo. Ope.arion shifrs

29

CAT SYSTEM COMPUTER CONTROL

The CAT (Computer-Aided Tuning) Svstem in the

FT-757GXII allows control of the ffequencv and

mode ol vfos and memories' selection berwee'

theú, and signal slrength detection and scan

ning confol by the operator's exlernal per-

sonal compuler. Uni or bi_direcrional serÌal

dala is passed via the CAT jack on ihe rear

panel of the transceiver, as folÌows:

EXAMPLE: to set 14.25000

Ml'lz as the currenl

oPerating frequencY;

Norice that, for lrequency parameters' the 100

MHz digir must be present and set to zero for

ffequencies

below 100 MHz. Also notrce

maL

decimaÌ lrequency data musL be translated rnto

BCD (binary-coded decimal) digits for sending,

and that the LSD (least signiiicant drgrt,

Parameter ,1, 100rs and l0rs of H,) Ìs sent

Return Delay and Read Status Commands

AI brr rru ol hé

lr'rrr'r.or'

of_ rj_

directional; from !he computer lo the !rans

.èi\ar .rl). l\e br-ai

è'rrorà ' s

ru riors

are lhe Return Delay and Read Status commands,

which have no elfect on operation of the FT-

757CXll except to cause il lo return currenl

operating status informalion on rhe SO (Serial

OLrtput, pin 2) line to the computer (alrer a

specified delay). Thls data alloii's rhe compu-

rer to check the starus ol the transcelver'

and so lhe program should send o.e of these

commands ro verify the transceiver state after

each series of i.structions. Also, the Read

Starus

command

is sent

lvith a 0l Paraneler

ro

read the digill2ed siSnal strength indrcatron

(0 ro 0Fh).

DATA RATE:

START BIT:

DATA BITS:

STOP

BITS:

PARITY:

4800 bits/sec

ó

2

The chart at lhe boltom of this page shows tne

entÍre data sequence for one CAI conmand'

Data is transmitted from the compuler to Lhe

SI (Serial Input) pin (pin 3 of the CAT jack)

lrom left to right in the diagram So' for

example, Pafameter (Parm) 4 of the cofìmand

Bìock is sent first.

Note: Aìl data blocks sent to the 7:7

must be five bYtes Ìon8.

The Instruction Code sent by the exterraÌ com-

puler at the end of each s-bvte Comnand Block

is the 'oPcoder that instructs the FT-757CXll

what actio! is to be performed. The lnslruc

tion Code Chart on the next page descfibes

each valid Comnìand. If an invalid (unListed)

command is senl, or if invalid pafamelers are

recognized, lhe transceiver wiÌl ign're the

Notice that most lnsLructions reqùire onÌy o'e

or no arguments in the Paraneter Byles Hoù

ever, every Conrìand Block sent to fhe FT-

757CXll musl àlways consist of five bvtes.

The unused parameter bytes will be Ìgnored

wherì such lnstructions are executed' so their

value is irfeLevanr

(rhey

need nor be zeroed).

CAT SYSTEM T1MNG CHART

Data Byte

Block

* l00ms

fvlAx

START

B]T DO D1 D2 D3 D.l D5 D6 D1 STOP

BITS

l2)

Code

(MSD)

Aiter ùe Rerurn Detay or Read Stalus comma.a

nas Deen

sent, the rransceiver

wili waìt for 0

to 255

ms, as ser by parameter

I of the Retur.

Delay comnand, ro a|oiv enough

.ime for rh€

conìpùrer program to ger set ro .ecejve the

status dara. The transceiver then rerurns

eirher one byre (if Paramerer

I is set ro 1 ì.

ùe Read SLatus

conmand, tor the S merer rndr

catio.), or 75 bytes (for complete status

informarion

on the vros and aI memories). tn

rl_è

rdr

-r .a.-. 7r oy

-, r" ,-p

arated by rhe detay set by rhe tast uùre rne

Return D€lay command

was sent. Note

thar 75

bytes are always returned after rhe Relurn

Delay command, as well as afrer rhe Read Srat_

*** This connand onty functions ùhen operating

Byte 1, Bit : (MR/vfo flas)). parameters nust

us command (wlrh Paramerer 1 = 0).

The Starus Update Chaft and accompanying

tables show t|e formar of rhe 75 byres re

turned after rhe Rerurn Deìay command, or when

the Read StaÍrs conmand is sent wìth a u pa.a_

merer: noLice rhar some flags

bit lields ìn the fjrsr starus byte.

'fhe CAT jack atso provides access ro the pTT

(Push

To-Talk) ljne ar pjn ,1

to allow Key,ng

the transmirte.. 'Ihis pin has 8V DC on it

wnen open-circui! (during

receprìon),

and ac_

tivates the transùjtrer when grourded (sour

cing 8 mA).

INSTRUCTION CODE CHART

NOTE:

Cornmands

ai:e sent in the REVERSE

of the order shown in tnrs chart.

code

(

llex)

MSD 2l4 LSD

SPIIT 01h p1 = 00 (oFF) or 0t (oN)

14R a2h pl = 00 - 09 (qtranneÌ

No)

Mp00 09 (

channel No)

D LOCK 04h pl = 00 (qFF) or 0'l (oN)

VlO A/E 05h !1 = 00 (A) o. 01 (B)

U VFO 06h p1 = 00 - 09 (ChanneÌ No)

BAND UP 07h Step up one Band+

BAND DI{N 08h !!e! dolln one Band*

CLARIFIER 09h trl = 00 (OFF) or 01 (oN)

FREO SEî+++ 0Ah D2 pl Frequency Set (

see ExMpL

)

SWAP 0Bh Swa

p VfO and Memory

IlODESEL 0ch p1 p'l vaÌue: 00=LSB, 01=USB

02=cww, 0

3=cwN,

04=Ar1,

05=F!1

IIGSEL 0Dh pt = 00 (csN) or o1 {HArrl t

RETURN DEIAY 0Eh pl - 00 to FFh ms detav**

FEAD STATUS t0h Pl = 00r or 0l (Meter onÌv

Eam

bands, or 0.5 t4Hz-

DeÌay betlreen response bytes from transceiver after receipr or RETURN

DELÀY or READ STATUS conmand.

on a vfo (test starus Update

be in ÈCD

fo.nat.

rx - any vaLue: byte witÌ not affect command function.

* aand steps determined by current Ean/cen seÌectron:

(

EvAÀ4pLE

) '01è:Àl4f Mttzt Lrr."q.

I

I

l

I

I

i

i'

I

I

I

I

contents Ref-

Table

Statqs Flaqs 1

2scaN

MoD!* (0o=oFf. 8oh=oNì

l

4Band Dàta 2

5èÌectèd Mènory channel No. (O 9l

69 operali4s Frequency (BCD) :

t0

1-14 lFo A Freqtredcy {BCD) 3

15

16 19 vFO

B Freg-ùency

(BCD) 3

20

21-24 clarifier Frequebcv IBCD) 3

2S cÌa!ifier r4ode**

26-29 Menorv Clanne1 0 Frequèncy {BcD) 3

30 Memory Channèl 0 Mode+*

.ll-f5 samè tormat as 26-10

36-40 same format as 26-:01+*+

41- 45 same folmat as 26-30

46-50 same forma! as 26-30

M@ry ch 5same format as 26 t0

56-60 sane folnat as 26-:ì0

sane format as 26 30

66 10 Menqay ch Isane fornat as 2

6

-.10

11 75 same fornat as 26 30

STAÎUS UPDATE CHART

(fornat of data returned by 757cxrr aftèi

REîuRN DEI-AY

connand, or READ sTAîUs conmand

TABLE BAìID DA,TA

Byte

Ranqe fMEz )

01

o2

03

a4

05

06

a1

08

09

2.5 4-0*

7.5 - 1 0.5

10.5

- 14.5

14.5 1 8.

5

18.5

- 2t.5

21

.5 25.A

25 -O 30. 0

* hish end of each band

iange is actuaÌly 10 Hz

belorìr the freq shown-

Indìcates position of front panèt swalcn

with lhe sane namè.

Byte vaLues a!è lhosè indicated for Modes

ia !hè lnstruction Code Char!.

calculaLe Menory channel adalresses by;

Channet Freq lndex = (ch No. x 5) + 26

Channel Mode lndex = (Ch No. x 5) + 30

TABLE 'I. STATUS FLAG BITS

Dial I-ock: 0 = OIî funlkd) 1 = ON (tocked)

Split: 0 = oFF (snptx) 1 = oN (sptir txlrx)

Cfarifier: 0 = OtF, 1=oN

A/Bvfo: 0 = A seÌecteat, t =vfoBselected

Mem/vfo: 0 = vfo opiatn, j = nenory operarion

Tx/Rx: 0 = receivins, j = transmittins

Gen/Ham: 0 = cen Steps, 1 = Ean Band Steps

TABLE 3. FREQUENCY DATA

Frequency diqits appear in the data strean as binary-coded atecimal {BCD: hex-

adeclnal representation of decimaÌ digirs), sith leading zero_fil1 to the

'100's of À{H2

digit, Bytes aÌ:e send in reverse order, as described earfier anal

again in the followinq example.

Index +

lndex +

lndei< +

lndex t

3) = 01h

2) = 23t,

1) = 45h

o) = 67}r

32-

TEST PROGRAM LISTING

Followìng is a Iisting of a BASIC program developed on an Apple [I computer

using a Yaesu FIF-654 CAT lnterface Unit, which tests a number of the CAT

System firnctions in the FT-7s7GXII. The pro$aú has been intentionally simpli-

fied so that it might easily be converted for use on other compùters with

other serial i/o systems and with other variations of BASIC. As such, it is

!!! usefirl as an application program by itself, but rather is intended to

provide some ideas for a simple approach to CAT programming,

which should be

combined with the users own concepts for useful applications.

This program

for their own

manual as the

is not copyrighted. Anyone is free to use any part of the code

use. For use in commercial applications, acknowledgement of this

source would be appreciated

REy +{rr+r InlLidt izÈ sè..aI r/o porf of 6ùputè! r+rrr*

FOR I = 1 TO 3 : PO(E CMDPORT.O :

Po(E cl4DPoRî,64: ?onE cMDPoRÍr207:

Data Port addrèss (particùÌar to rrî 65la

Port address

chtp (425r usaRr in rlF 65la) for init.

for 4300 batrd. no parity, I stop bit.

"(0)...Enter rreqùèncy"

rr(e

)...Rèàd statstr

fron keybóard

to lnteqer (r0 s Òf ksz)

REM 100 s and 10 s of úEz

and 100 s Òf kHz

1èawe 100 s & t0,s of r:2.

send to xcvr, and loop.

cét ne* Prèqùèncy, test foi waÌid

ne{ Freq. {decinal ùrz)" ; rREo

rF IREO < o.rso oR fREo > 29.99999 €nter !req." : GOTO tto

FREA inlo pdirs of decifrl d;9rls 'r{}rl

6,I0

.REO : aREO i 10000 :

MEZ = rNT (|REQ / 100000) :

IrxHz = rNT (IREO / r000t r,rHz

r r00 :

sz = IREo

sz - rNT

(Hz

+

0.s)

* r0:

I{dz = rNr (FRÈo

/ 10) Ez*r0000 s(Ezir00 : REù lo's and I's of kriz

DéciÌal atlgit

r1 = rNr (MHz / 10J + 16 + úEz rNr {ù'sz / 10) * 10

P? = rNr (ùKrz / r0) * 16 + ú(Iìz - rNr (Mruz / r0) * 10

F3 = rNr lxnz / 10) + 16 + Krz rNr (ruz / r0) * r0

14 = rNr (rz / 10) * 16 + Ez rNr (!z / r0) * r0

1000 : Goro 100 :

sèt rnstructi@ anit Padèt* for othèr cóllìmnds ;***'*

IFCMND=2T]ìEN

rF cúND

= 3 rsm rNsr - 12: P1

= 2:

rNsT=12: P1

=3:

IFCÙND:5TSEN

rNsT=12: P1

=5:

rFiaD.aTEN

rF o{D = 9 TsN GOrO 300 :

GOSùB 1000 . Gol! r00 :

= set Mode. Pl = lsb

REù rnstrùclion = set Moder ?1 = cr-q

REú rnstructión - set Modè, Pl = an

lEd rnstruction = set vfo a/8, Pr = vfo a

- ser wfo a/8, P] = vfo È

s€lèct atata

for alf srars,

33

Dèternine typè

rmp for s neter data

7

send "Retufn Dè1av" connand rèlurns 75 bYtè statùs update i**i-'

340

lNSr.14: ?1

=

100: GOsuB

r00o:

7s bytes as èhev Trarscèiwèr *++"**

!r'te lri ; I , lroPorr) : REù Prirt statls bvt€ rèad

NEXT r : COTO lO0 : REù Read àno'h€r

: Porn loPoRT'P]

check serial

20r0 rosraT = PEr< (CrlDrOÌTl

:

rNr (rosîar / 2) :

2Or0

RSTÀT]

= rNr lRxRDt / 2) . RSaÀr2

= R\RDY

/ 2 :

RlM i+++** Send conmandr dtr rèad

rNsl=r6:P]

!Rl\r "siqnal ; Pnn( lroPorr) :

I bl-te s-úète! data ******

REú rnst = read

ixrcy flag (bir r) to bit 0

o.rd 1sèt) or Even lrèset)

REM io.p untrl it is set

RECEIVER FRONT END PROTECTION

The feceiver front end in FT-757GXIÌ includes

surge suppressor and a lamp fuse

to protect the sensitive receiver clrcultry

ffom high voìtage pulses (ENlP) at the antenna

terminal. Several thousands of voÌts can dev-

elop natu.ally when dry wind or elec.ricaL

storms create an electrostatic charge on the

an!enna eLements, a.d this is delivered to the

antenna jack jf the antenna is connected to

lhe transceiver. In such a case, the lamp fuse

may burr out (even ii rhe transceive. is

rurned off at the lìme). The onll' way to avoid

this condilion is to disconnect the àntenna

from rhe transceiver $,ìrenever the wealher is

ìikeìy to create high voÌtàge on rhe a.tenna

(the feedline should be connected to ground to

allow lhe charge to dissipare).

If the receiver is found to have suddenly losl

sensirlviry, i.spect the filament of the lamp

r"p (l

l00i o ,l- af U r'ì. If t rs

npFr.

try to determine the cause of the overvolrage;

eg., was rhe antenna lefL connecied durlng an

F,c.

-r.t \ ) \ ,c) sódrì

èr -inc-

you Ìast used the equipment? lo obtain re-

placement Lamp fuses, ask your local Yaesu

deaìer for Yaesu part no. Q1000010,

BQ0,11

22803Aj of substitule any 8V l00mA pÌlot lamp.

Do not jumper across the lamp fus€ lerminals

however, as this will defeat rhe protecLion

and could resuÌt in serious damage.

S.c pictùrc

bclo\r

f.r the lo.ation of the lanr! fuse.

LAMP FUSE

(F )

34

E

T

z

F

î

z

IT,J

z

o

IJJ

F

3

:>

ì i ; 6 i 6 ó ó : '; - Ì . 6 2 = :

F E E E E-F E

E

E

E;lE

F 3 3 i:

E;

F:

i

=: F F F F r: F F J :=: ?: e: a e

= à

=i!i-.zzzzz+z=j

=

E

i E

R E E E E

-È É 5 É

É;'ei

i 3

i : : t r

"

;

E i!

E

F

E

E

F

E

E

E;

E E':=:

= 3;::À

= a t = ! >

> > > > > > > ; ! J=.

e + z z z z

é

r

É:

;:

R

s

"': E

È È È

{ i;:3

*

i

3

Í

í

€

) - -,zL

>E:EE:

É

, t = > E > E

= = > I =

-'

= e = = z z z z E

t

=

!:

*

g

s

F È

a

È È È

E;::

Í

q:;:

s

i; É

36