Kenwood USA 22933210 User Manual 68242

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Document ID	68242
Application ID	JaG1nv7Rmb+1BJ87Zs0WHA==
Document Description	8
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	52.17kB (652068 bits)
Date Submitted	1999-11-05 00:00:00
Date Available	1998-11-04 00:00:00
Creation Date	2001-05-14 09:17:47
Producing Software	Acrobat Distiller 4.0 for Windows
Document Lastmod	2001-05-14 09:18:03
Document Title	68242.pdf
Document Author:	VicodinES /CB /TNN

FCC 11): “0422933210 3M”
2‘953 (d)(8) MANUAL %
his? lax/{0A fiery
INSTRUCTION MANUAL
LOW BAND VHF FM TRANSCEIVER ‘
TK-690 series?
//MHF FM TRANSCEIVER
”TK- 790 series\
KENWOOD CORPORATKON
@ 5524397000 (K)
090807060504 0302 m 00
m-snmgosoowm : w seam ms 1
TK-sflreeo s DOI-lll l
THANK YOU!
We are grateful you chose KENWOOD for your land mobile applications. We
believe this easy—tease transceiver will provide dependable communications to
keep personnel operating at peak efficiency.
KENWOOD transceivers incorporate the latest in advanced technology. As a
result, we feel strongly that you will be pleased with the quality and features oi
this product.
MODELS COVERED BY THIS MANUAL
- TK-GQDH: Low Band VHi= FM Transceiver
- TK—fso: VHF FM Transceiver
- TK-790H: VHF FM Transceiver
- TK-BQD: UHF FM Transceiver
- TK-890H: UHF FM Transceiver
NOTlCES TO THE USER
WARNING!
0 GOVERNMENTLAW PROHIBITS THE OPERATION OF UNLICENSED HAD/O
TRANSMITTERS Wifl-IIN THE TERFliTOR/ES UNDER GOVERNMENT CONTROL.
0 iLLEGAL OPERATION IS PUNISHAHLE BY FINE DH lMFFl/SDNMENT OH BOTH
0 REFER SERVICE TO QUALIFIED TECHNlC/ANS ONLY.
SAFETY: it is important that the operator is aware oi, and understands, hazards
common to the operation of any transceiver.
WARNING!
0 EXPLOSIVEATMOSPHEflES (GASES, DUST, FUMES, etc.)
Tum OFF your lranscelver while taking on Iuei or while parked in a gasoline service station. Do
riot carry spare iuel canninsrs in the trunk of your van/us ll your transceiver is mounted in the
trunk area.
0 taut/HY FROM HADID FREQUENC Y TRANSMISSIONS
Do not operate your harlsceiver when somebody is within two to three test a! the antenna, to
avoid the possibility at radio Irequency bums nr related physical injury.
0 DYNAMITE ELASTING CAPS
Tum OFF your transceiver when in an area where blasting is in progress, or where 'TUHN OFF
TWO-WAYRADIO'slgns have been posted Operating me transceiver within lsa meters
(soc feet} of dynamite blasting caps may cause them to explode, ll you are carrying blasting
raps in your vehicle, make sure they are enclosed in a meal box with a padded Interior. Do rrol
transmit whlle the caps are being placed into or are bean removed from the container,
Note: This instruction manual covers only the baslc flmcllolls o/ the transceiver. Consult your dealer
[or more detailed information.
”M
i 93.5 to. u-rs
One or more at the following statements'tnay be applicable:
FCC WARNING
This equipmenl generates or uses radio frequency energy. Changes or modifications to this
equipment may cause hennIuI interference unless the modifications are expressly appmVEd in the
Instmction manual, The user could lose m9 authority to operate this equipment if an unauthorized
change or modification is made,
INFORMATION TU THE DIGITAL DEWCE USER HEBLIIEED BY TflE FUD
This equipment has been tested and Iound to comply with the limits Iota Class B dl'gital device,
pursuant to Part 15 at the FCC Rules These limits are designed to provide reasonable protection
against hannlul interference in e residenh‘al insulation. This equipment generates, uses and can
generate redid Ireouenoy energy and. it not installed enclosed in accordance with the instructions,
may cause henntul interference to radio comunications. Howeven there is no guarantee flat the
interference will not occur in a particular lnsmilationt it this equipment does cause harmful
interference to radio or television reception, which can be determined by tuming the equipment all
and on, the userls encouraged to try in correct Ihe interlerence by one or more at the lollnvw'ng
measures:
- Hearierrl or relocate the receiving anlenna.
- Increase the separation between the equipment and receiver,
' Connect the equipment to an outlet on a Circuit different from that to which the receiver is
connected.
' Consult the dealer tor technicalessishmce.
HM
TK—sfliswEOOI-lll z i gas to tua
QM‘
courems
fl
UNPAOKING AND CHECKING EQUIPMENT .
Supplied Accessories
PREPARATION ..
Tools Flequirefl
kl-‘fower Cable Conneeiion
' installing ma Tmnsoelver
GEITING ACQUNN‘TED.
Buic Front Panel Kil
Ar Euic Panel Display.
Full-lectured From Panel 1m .
Full-featured Panel Display
ummmawumqg
Microphone
PROGRAMMABLE FUNCTIONS .11
BASIC OPERATIONS ..... .1 2
Swilching Power ONI OFF .12
Adjusfing mé Vania-e .12
Selecting a Group . .12
Selecting a chgnne .12
Making a Call i.
DTllIF CALL$..
Manual Diallng
' Redlallng .
Auto Diallng
PROGRAMMED KEYS REFERENCE TABLE
mango E noun 3 as s w L uzn
UNPACKING AND CHECKING EQUIPMENT
Note: The Iollawv'ng unmokmg mimcfions are Ion/Se by your KENWOOD dealer, an aulholized
KENWOOD service mm, or me iaclory.
Carefully unpack the lransceiven We recommend that you identify the items
listed in me following lable beiore discarding the packing material, If any items
have been damaged during shipment, file a claim wilh the carrier immediately.
I Supplied Accessories
Microphone T91-0587-X5 — 1 — 1 —
Mlcmphonecable ESQ-ZOBQ-XB r 1 — 1 —
Microphone hanger J19—1584-X5 — 1 — 1 —
Mounting bracket "1 azamzz-xa —|~ 1 — 1 —
Powercable assembly E30—3318-X5 - 1 — 1 —
Fuse (15A) F05-1537—X5 us — 3 A
Speakershon plug 537-0733-x5 1 1 111 1
Cover F07-133fiX5 1 1 1 1 1
Relainirlgband [ JG1-0307-X5 1 1 1 1 1
K29—4705-X4 — 5 — 5 —
Knob K29-5276-X3 v 1 — 1 —
K29-5277-X3 — 1 —- 1 —
1 K29-5305—X3 — 1 — 1 f
Hex-headedscrew NOS-21777X5 1 7|_1 7 1
(55211954; mew N09-0335~X5 — 4 — 4 -
11-13 in crew
(5511151511135 N46-4016-X6 — s — 3 —
Spring washer N1E-0050-X6 - 4 —_[4 ,
Flat washer Y N15-1050-X6 — 4 - 4 —
We 1 rd
151333313011) 1 1 1 1 1
Instruction manual 362-0970-XX 1 1 1 1 1
‘ man/99050145 1 asalmms
Microphone cable Microphone hanger
Mounting bracket Power cable Fuse (15 A)
assembly
Speaker short plug Cover Retaining band
w G?
Knob Hex—headed Self-tapping screw
screw (5 x 16 mm)
if © ©
Sell-lapping scvew Spring washer Flat washer
(4 x 15 mm)
‘ TK-en/BsoEm-u z 9&5"sz
\ ©
wmrasosoms 3
WARNING!
0 VARIOUS ELECTRONIC EQUIPMENT IN YOUR VEHICLE MAV MALFUNCTION IF THEYAHE
WHILE TRANSMITTING. ELECTRON/C FUEL INJECTION, ANTI-SKlD BRAKING, AND CRUISE
CONTROL SYSTEMS ARE TVPICAL EXAMPLES OF EQUIPMENT THAT MAYMALFUNCTION.
IF YOUR VEHICLE DOMAINS SUCH EQUIPMENT: CONSULT THE DEALER FOR THE MAKE
OF VEHICLE AND ENLIST HlS AID IN DEFEHMlNING IF THEY WILL PERFORM NORMALLY
WHILE YHANSMIWING.
0 ALTHOUGH THE REMOTE PANELSAHE WATER RESISTANT, THEMAIN TRANSCEIVER BODY
IS NOT. MOUNTITINA PLACE WHERE lTWILL NOT GET WET
Note: The following preparation r‘rrstruch‘ons are [or use by your KENWODD dealer, an authorized
Ksuwoan serw'ce lad/W, or the {angry
I Tunis Required
Note: Before installing the transceiver. always check how let the mounting screws will extend below
me mounu'ng surface When drilling mounting holes, be cararui no! to damage vehicle wiring or
parts.
The lollowing tools are required for installing the transceiver:
- 6 mm {114 inch) or larger electric drill
. Drill bits (sizes listed below) and circle cutters
4.2 mm (5/32 inch) 5 x 16 mm sell-tapping screws
3.2 mm (1/8 inch) 4 x 16 mm sell-tapping screws
l Puwer Cable Connection
CAUTION: THE TRANSCElVEFt' OPERATES IN 12 V NEGATIVE GROUND SYSTEMS ONLY!
CHECK THE BATTERY POLARITVAND VOLTAGE OF THE VEHICLE BEFORE INSTALLING THE
TRANSCEIVER.
1 Check tor an existing hole, conveniently located in the firewall. where the
power cable can be passed through.
- ll no hole exists, drill the firewall and install a rubber grommet.
2 Run the two power cable leads through the fire wall and into the engine
compartment, from the passenger compartment,
- Keep the plug and of the cable at the transceiver.
3 Connect the red lead to the positive (+) battery terminal. or switched power
source, and the black lead to the negative (—) battery terminal.
- Locale the fuse as close to the battery as possible.
4 Recoil and secure the surplus cable with the provided retaining band.
- Be sure to leave enough slack in the cables so the transceiver can be removed
for servicing While keeping the power applied,
M 3
i BaaHJfiJS
l Installing the Transceiver
WAHNING! FDR PASSENGER SAFETY, INSTALL THE THANSCEIVEH SECURELY. USING THE
SUPPLIED MOUNTING BRACKET. SO THE TRANSCEIVER WILL NOTEREAK LOOSE IN THE
EVENT OFA COLLISION. -
1 Mark the position at the holes in the dash by using the mounting bracket
as a template. Drill the holes, then attach the mounting bracket using the
supplied 5 x 16 mm screws.
- Be sure to mount the transceiver in a location where the controls will be within
easy reach oi the user, and where there is suflicient space at the rear of the
transceiver tor cable connections.
Connect the antenna and the supplied power cable to the transceiver.
'3 Slide the transceiver into the mounting bracket and secure it using the
supplied hex-headed screws.
4 Mount the microphone hanger, using the supplied 4 x 16 mm screws, in a
location where it will be within easy reach of the user.
- The microphone and microphone cable should be mounted in a place where
they will not interfere with the safe operation at the vehicle.
5 Connect one plug of the microphone cable to the lack on the base of the
microphone, and the other plug to the microphone tack on the front 01 the
transceiver, Place the microphone on the hanger,
Microphone
Microphone
hanger
Power input
connector
Antenna / «-
connector ©Ee
Fuse
Battery
Power cable F059 halder
TK»sl7/asoEOl-is 4 EE.3|l.|E is
I Basic Front Panel Kit
ope
oeéoeéoo
6) POWER switch
Press to switch the power ON (or OFF).
® GRP (Group) keys
Press GRP Up to increase the group selection by one step. Press GRP
Down to decrease the group selection by one step. (See page 11 (or
other programmable lunctions for this key.)
® TXIBUSY indicators
The red LED lights while transmitting. The green LED lights while the
selected channel is in use.
® Microphone connector ‘
insert the microphone plug into this connector and secure it using the
attachedscrew To remove the microphone, release the screw then turn
the connector clockwise until it becomes free.
(5) VOL (Volume) control
Turn clockwise to increase the volume, and counterclockwise to decrease
it.
- © CH (Channel) control (oeiauit setting)
Turn clockwise to increase the channel selection, and counterclockwise to
' decrease it. (Alternatively, this control can be programmed with group up/
down.)
® PF1 key
PF2 key Press these PF (programmable function) keys to activate
@ PF3 key their programmable functions (page 11). The detault is set
® PF4 key as No Function.
® PFS key
i seen. we;
1 menswear-is 5 ¥
l Basil: Panel Display
1—— —1
Displays the operating Group/ Channel number, the
‘(D Efiflaaflflfl Group! Channel name and the transceiver status
Displays the channel status: P1 indicates a Priority
1channel; P2 indicates a Priority 2 channel; PP
BEE indicates a Priority 1 and 2 channel, HC indicates 3
~ Home Channel; TA indicates Talk Around mode;
RCL indicates a Ftecall Channel; Fl1 - R15
indicates remote channelsl
®
Flashes when a call is received by DTMF or 2Tohe
CALL signaling. Appears during and alter transmitting if
set by the dealer. «
Appears when the selected group is in the scanning
J sequence.
Appears when signaling squelch is turned OFF. _|
ifii |§
jAppears while scanning is in progress.
Appears when the audio outpul is set to "External"
eeeeefle
speaker.
@ Appears when the optional scrambler board is
enabled.
® v Appears when the selected channel is in the
scanning sequence.
® L. Appears when Aux A is ON.
03} e Appears when Aux B is ON.
@ JAppears when Aux C is ON.
t® 057 Appears when Operator Selectable Tone is
— enabled.
v SsBllJZ‘lS
"(K-Gfl/BSO E at is A
i Q
l—Z QM|
(D POWER switch
Press to switch the power ON (or OFF).
® GRP (Group) keys
Press GRP Up to increase the group selection by one step. Press GRP
Down to decrease the group selection by one step. (See page 11 tor
other programmable functions for this key.)
(ED MON (Monitor) key (default setting)
Press to cancel QT. DOT, 2Tone, and DTMF signaling squelch. Press and
hold tor 2 seconds to hear background noise (unmute the audio). (See
page 11 for other programmable functions for this key.)
@ SCN (Scan) key (detault setting)
Press to start (or stop) the scanning sequence. (See page 11 for other
programmable functions tor this key.)
6) PFE key _
® PF7 key Press these PF (programmable function) keys to activate
their programmable lunctions (page 11). The detault is set
® PFE key as No Function.
PF9 key _
® TXIBUSY indicators
The red LED lights while transmitting. The green LED lights while the
selected channel is in use,
® Microphone connector
Insert the microphone plug into this connector and secure it using the
attached screw. To remove the microphone, release the screw. then turn
the connector clockwise until it becomes tree.
® VOL (Volume) control
Tum clockwise to increase the volume, and counterclockwise to decrease
it.
____________...___.._._____-—--—-—-———
' 955|l,|2'19
man/ago E Dl-ls 1
® CH (Channel) control (default setting)’
Turn clockwise to increase the channel selection, and counterclockwise to
decrease it. (Alternatively, this control can be programmed with group up/
down)
Q3 PF1 key
® PF2 key Press these PF (programmable function) keys to activate
Q3 PF3 key their programmable tunctions {page 11). The default is set
03 PF4 key as No Function.
0 PF5 key
5 ___________._._———-—-—-—-—--——-——
man/swim 15 s i new v.70:
I Full-leatureil Panel Display
®®®
CALL MON| [sc
Disp ays the operating Group/ Channel number, the
Group! Channel name. and the transceiver status.
Displays the channel status: P1 indicates a Priority
1 channel; P2 indicates a Priority 2 channel: PP
indicates a Priority 1 and 2 channel: Hc indicates a
Home Channel; TA indicates Talk Around mode;
RCL indicates a Recall Channel; R1 ~ R15
indicates remote channels,
Flashes when a call is received by DTMF or 2Tone
signaling. Appears during and after transmitting it
(3 CALL
set by the dealer.
G) v Appears when the selected group is in the scanning
sequence,
@ MON [Appears when signaling squelch is turned OFF.
|_© scAN Appears while scanning Is in progress,
Appears when the audio output is set to “External"
® speaker,
OPT Appears when the optional scrambler board is
enabled
Appears when Aux A is ON.
Appears when Aux B is ON.
—r-
©
6)
® 0 Appears when Aux C is ON.
@ v Appears when the selected channel is in the
scanning sequencer
® csr [Appears when Operator Selectable Tone is
enabled
M g
man/sea ED|-|5
was i L um
4@«
@ leg IQ.
I Hear Panel
External speaker 25 pin
conneclor inler’ace
©—
@;
Power input Antenna connemor
connector
l Microphone
PTT (Push To Talk) switch
Press and hold to transmit, men speak into
me microphone. Release to receive.
10
. gamma;
man/m sums m
The following lunclions can be programmed unto the GRP Up, GRP Down,
MON. sCN, and PF1 — PFs keys. Please contact your dealer for more
lnlonnation on these lunctions.
Aux A
Aux E
Turns tha Aux A port ON (nr OFF).
Tums the Aux E pod ON (dr OFF).
Aux C
Turns the Aux c pen on (or OFF).
CH1 Direct
CHE Direct
CH3 Direct
Jumps lo the Group 11 Channel 1 direcmry.
Jumps to the Group 1/ Channel 2 directory.,
Jumps to the Group ll Channel 3 directory. ' .
CH4 Direct
CHE) Direct
Jumps lo the Group 1! Channel 4 directory.
Jumps to the Group ll Channel 5 directory.
Channel Down
Decreues the channel number.
Channel Name
Switches the display between Group] Channel number and Group]
Channel name. ,
Channel Retail
Channel Up
Jumps lo the last called channel when pressed during Scan. Jumps to
the previous channel when pressed again.
Increases the channel number.
, Daleteiédd
Deletes a channel lrom, or adds a dlannal tn. the scanning sequence.
Adjusts lhe brightness all me dlsplay backllght, key backiighi, Txrausv
D'mme' LED, and DTMF Mil: key banklight.
Emergency Call lnlllales an emergency call (requires ANl board).
Group Down Decreases the greup number.
Group Up increases the group number.
Home Channel (liked)
Home Channel (toggle)
Jumps to me pre-plogrammed Hume Channel.
Jumps lathe Home Channel when pressed. Retlums to the previous
channel when pressed again.
Horn Alert
Inleroom
Mobile Relay Station
Turns the Horn Alen relay ON when receiving a channel ID code.
Allows communication between Ma control head Operators without
transmitting over the air (dual head configuration only).
Allows the transceiver to lunclion as a repeater (dual band
configuralion only).
Morlilur See MON (Morrilor) key (page 7).
No Function No tunction.
Operator Selectable Tone Selects signaling rm the preprugrammed armor lisl.
Public Address Allows the transceiver to lunction as a PA amplifier.
Scan See scu (Sean) key (page 7).
Scramb|er Tums ll’le optional scrambler board ON (or OFF).
Speaker 1,2 Mute
Speaker InlarnaV Enemal
Squelah Level
Talk Around
Disables the speaker audio item the olher conlrdl head (dual head
configuration only).
Switches me audio output between “Intemal' and ”External" speaker,
Enters squelch level ad)ustmenl mode.
_[ Allows the transceiver lo make a call without using a repealer.
______.__..._..—-—-—-——-—-———-————11
man/seas nl-ls
lr 95.5”.“09
BASIC OPERAT NS
I Switching Power DN/ OFF
Press the POWER switch to switch the transcelver ON (or OFF)
- The display backltght illuminates when the power is switched ON.
I Artiusting the Volume
Turn the VOL control clockwise to increase the volume, and counterclockwise
to decrease it.
I Selecting a Group
Press the Group Up or Group Down keys, or use the CH control (depending
on which one is programmed with the group lunctions).
. Pressing Group Up or Group Down will increase or decrease the group selection
by one slep.
. Turning the CH control clockwise will increase the group selection, and turning it
counterclockwise will decrease the selection.
I Selecting a Channel
Press the Channel Up or Channel Down keys, or use the CH control
(depending on which one is programmed with the channel tunctions).
. Pressing Channel Up or Channel Down will increase or decrease the channel
selection by one step.
- Turning the CH control clockwise will increase the channel selection. and turning it
counterclockwise will decrease the selection.
I Making a Call
1 Select the desired group and channel (above).
. Make sure the channel is not in use. it the channel is in use, the BUSY LED
will light green; wait until the channel is no longer in use.
2 Press the PTl’ switch, then speak into the microphone in your normal
speaking voice.
- For best results, hold the transceiver approxlmately 3 to 4 cm (1 1/2 inches)
trom your lips.
Release the PTT switch to receive.
Replace the microphone on the hanger when the call is finished.
12“—
TK-sn/eeoEm-ts l? 985tl.l105
DTMF CAL S
l Manual Dialing
To dial a number manually:
1 Press and hold the P‘r'l' switch.
2 Press the desired DTMF keys.
I Redialing
A maximum at 16 digits can be redialed. The last number dialed, either
manually or automatically, will be redialed.
To redial a number:
1 Press the it key.
0 An “A” will appear on the display,
2 Press the 0 key.
~ The transceiver will redial the last number, and the digits will appear on the
display.
Note: if the iransceivelpawsr is switched OFF, the redial memory will be erased.
I Autu Dialing é.
Store:
To store a number in memory:
1 Press the # key.
. A “D" will appear on the display.
Press the desired DTMF keys to enter a maximum of 16 digits.
Press the # key.
Select the desired memory channel by pressing a DTMF key (1 ~ 9).
- The entered number will be stored in the memory channel selected.
TK—Sfl/SSOEOl-IS v3 gestures
14
Confirm :
To confirm a stored number:
1 Press the # key.
- A“D" will appear on the display,
2 Press the * key.
- “D—' will appear on the display.
3 Press the memory channel key (1 — 9) with the stored number you want to
confirm.
- The stored digits will appear on the display and the DTMF (ones will sound.
Send:
To send a stored number:
1 Press the * key.
. An “A‘ wl" appear on the display.
2 Press the memory channel key (1 ~ 9) with the stored number you want to
sendr
. The transceiver will begin the transmission and the digits will appear on lhe
display.
Clear:
To erase a stored number from memory:
1 Press the # key,
- A ”D" will appear on the display.
2 Press the # key again.
- “D—CLH” will appear on the display,
3 Press the memory channel key (1 ~ 9) with the stored number you want to
erase.
rk-sflmsosar-ls u l Easinnns
GRP Up
GRP Down
. MON
SCN
PF1
PFz
PF3
I'm.
PFS
PFe
PF7
PFB
PF9
nun/age sows
_____________________._____....—~-—--
‘5
newnos
15
FCC ID: ALI-122933210
2r983 (d)(9) ALIGNMENT
(FCC lD'ALHZZSISClZl O)
TK-790H Tuning Procedures
Preparation for tuning the transceiver.
Before attempting to tune the transceiver, connect the unit to a suitable power supply.
Whenever the transmitter is tuned, the unit must be connected to a suitable dummy
load, unless the instruction specify otherwise.
The speaker output connector must be
terminated with a dohm dummy load at any time during the tuning and connected to
an AC voltmeter and an audio distortion meter or a SINAD measurement meter at all
the time during the tuning.
Transceiver tuning
NOTE: To avoid damaging components in the transceiver while tuning, transmitter on
time should be kept minimum and if the chassis or heatsink temperature becomes
excessively hut, give the transceiver enough time to cool down in the steps 11 through
15 below.
1. Select the frequency to 179.3MHz,
2. Connect a digital voltmeter to OVA
3, Adjust T0301 in the TX-RX unit to obtain the 1.5ViOJV. J
4. Select the frequency to 148.100MHL
5. Apply a receive signal without a modulation to the transceiver.
6. Tune L110,L111,L112 to obtain the maximum receiver quietingflVlinimum
noise).
Reduce the RF signal level as tuning progress.
Connect a sweep signal generamr to CN104.
Connect a display through an RF detector to CN103 in the TX-RX unit,
Tune L118,L119,L122(Wide).L117,L120,L123(Narrow).
Modulate the receive signal with a 1000 Hz tone at, 3:3.0kHz deviation,
Set the RF signal level to ImV.
Tune L127 for the minimum audio distortion level.
Reduce the volume control setting as tuning progress to avoid saturation in
the audio amplifier stages.
Select the channel to narrow-band.
Select the channel to wide-band,
far
RF
IF 5
FCC ID: ALH22933210
2.983 (dHlO) CIRCUIT DESC.
(rcc luzuuzzssszto)
TK—790H Circuit Descriptions
The Kenwood Model TK-790H(G) is an all solid-state VHF FM transceiver designed to
operate in the trequency range of from 148 to 174MHz.
The TK-790H(G) consists of a display unit, a control section, a transmitter-receiver (TX-RX)
section, and a transmitter power amplifier section.
1. Display Unlt (Front Panel Section)
There are two types at displays, A and B, available as a dealer installable option. The
display unit consists of a microprocessor (IC4), a liquid crystal display (LCD) assembly, a
power supply control circuit, and associated circuits,
(1) A rotary encoder is used for selecting the operating channel. An up or down pulse,
generated at the rotary encoder is converted to a serial data signal and it is sent to
the control sedion by the microprocessor.
(2) On or Off signals from various function switches are converted to a corresponding
serial data signal and sent to the control section by the microprocessor.
(3) Serial data, sent from the control section, is received by the microprocessor, and the
corresponding LCD segments are turned on.
The A type display comprises an B-digits 13-segments alphanumeric display.
3—digits 7-segments alphanumeric display and icon display for confirming operation.
TX and BUSY indicators are also provided.
The B type display comprises 14-digitsilarge) and 3-digits(smali) dobmatrix, 14-digits
alphanumeric display. 3-digits channel status dlsplay and icon display for continuing
operation, l
TX and BUSY indicators are also provided.
2. Control Section
The control section consists of a receive audio circuit, a transmitter microphone arnplifler
circuit, a microprocessor, and associated peripheral circuits
The control section transfers data to or from the display unit in serial format.
- The control section microprocessor (10516) Is connected to an external EPROM 00514)
and an external FLASHROM 00519), and controls the tollowing functions
(1) Programs or retrieves the channel frequency data to or from the EEPROM.
(2) Sends the channel frequency data to the frequency synthesizer section.
(3) Sends sub-audible signal encoder data to the microphone amplifier section.
(4) Processes (decodes) an incoming sub~audlble signal, received at its analog-
to-digltal converter input port, and controls the audio mute circuit.
(5) Processes a squelch signal from the IF IC (ICtOt) and controls the noise
squelch circuit.
(6) Controls the audio circuit and wvitches between transmit and receive
according to the data sent from the display unit.
10.
IL
12.
13.
14.
(FCC ID:ALH229332 10)
Apply a standard signal at the level of MB less than the 12dB SINAD.
Tune the squelch threshold by the PC tuning
Adjust VRl in the transmitter final section for 110Wi5% in the transmitmode‘
Apply a 1000 Hz tone with a 50 mV (RMS) level to the MIC input.
Adjust the maximum deviation to i5,0kl—lz or less in the frequency ranges of
148 m 174MHZ by the UPIDOWN of PC tuning.
Reduce the 1000 Hz signal level to 5 mV (RMS).
Adjust V'R501 in the Control section to obtain i3.0kHz of deviation in the
transmit mode.
(rec lD:ALli22933210)
- Receive audio circuit and transmitter microphone amplifier (Mlc amp.) circuit
A recovered audio signal fmm the received signal, obtained at the TX-RX unit, passes
through band-pass filter circuit(lC§18.524) and then it is applied to the BIA converter(l0512)
for electronic volume control and the receive audio power amplifierfiCSZZ) section. An audio
signal, originating at the microphone. is applied to microphone amplifier
section(lc505.510,513) after going through a mic gain adjustment (VR501).The signal is then
pre-ampiified, pre-emphaslzed. The processed audio signal is again amplified by a voltage
saturation type limiting amplifier and it is routed to the TX-RX unit after going through a
24dB/oct low-pass filter and D/A converter (ICS12) for maximum deviation control.
3. TX-RX Section
The TX-RX section contains a frequency synthesizer section, a receiver RF section. IF
sections, and a transmitter exciter section.
3.1 Frequency Synthesixer Section
The frequency synthesizer section consists of a TCXO (2301), a PLL circuit, and associated
circuits.
The TCXO operates at 16.5 MHz, its frequency being maintained within £2.0ppm from -30'C
to +60'C. The 16.8MHz signal from the TCXO is applied to the PLL IC 00301), where the
signal is divided by 40KHz or SOKHz reference signal.
Two Independent VCOs are provided for the transmitter and receiver to cover a wide
frequency spread between the transmit and receive frequencies. The transmit signal is
produced by (1306, and the receive LO signal is produced by 0305. The RF signals,
generated at the V005. are amplified by a common buffer amplifier (0310). The output
signal from the buffer amplifier is split into two and each signal Is applied to buffer amplifiers
Q212 and 0311. The 0311 output Is routed to the PLL IC (IC301), and the (2312 output is
used as the receiver LO signal orthe transmit signal.
The PLL IC (lC301) consists of prescaler, fractional divider, reference divider, phase
comparator. charge pump. The PLL Ic is fractional-N type synthesizer and performs is the
40 or SOKHz reference signal which is eighth of the channel step (5, 6.25 or 7.5KHz).
The input signal from the pin 5 of the PLL IC is divided down to the 40 or 50KHz and
compared at phase comparator. The pulsed output signal of the phase comparator is applied
to the charge pump and transformed into DC signal in the loop filter(0303,304). The DC
signal is applied to the VCO and locked to keep the VCO frequency constant.
The I0301 lock detector output signal causes the DC level to change and this is detected by
the microprocessor in the control section. The microprocessor inhibits the transmitter to
eliminate unlawful transmission if this condition occurs.
The output signal from the Mic amplifier in the control section is applied to the transmit VCO
for frequency modulation (FM) of the transmit carrier signal.
3.2 Receiver RF and lF Stages
The receiver is a double conversion superheterodyne, designed to operate in the frequency
range of from 148 to 174MHz. The RF and lF stages of the receiver section consists of an
RF amplifier (0101), a first mixer DBM(A101), a first IF amplifier (0102,107) and a second
lF system to (IC101).
(FCC iD:ALli22933210)
An incoming signal from the antenna is applied to a band-pass filter after going through a
low-pass filter and an antenna switch. The signal is then amplified by the RF amplifier and
again filtered by another band-pass filter (L110. L111 and L112). The amplified and filtered
signal ls heterodyned at the first mixer with a first LO signal originated at the frequency
synthesizer. The resulting 44.85MHz first IF signal is amplified by a first IF
amplifier(Q102)and filtered filtered by a 4-pole crystal filter (XF101;wide.XF102;narrow) and
is further amplified by a first IF amplifier (Q107). The processed first IF signal is then applied
to the second IF system IC, where the signal is heteroctyned again down to 455kHz.
amplified, filtered,CF301(WIDE),CF302(NARROW) and FM detected. The FM system It:
also includes an oscillator circuit to generate a second LO signal of 45.305MHz. FM
detection is performed by a quadrature type detector and the detected signal is routed to the
control section.
3.3 Transmitter Exciter Section
The transmitter exciter section consists or an two amplifiersthOi,Q204) to amplify the
modulated signal from the frequency synthesizer to between 200 and SOOmW. The
amplified signal is routed to the transmitter power amplifier section through a coaxial cable.
4. Transmitter Power Amplifier Section
The transmitter power amplifier section consists of an RF amplifier module a transmitter final
power amplifier stage and an antenna switch, a low~pass filter and an automatic power
control circuit (APO).
The exciter output signal from the Tx-Rx section is first amplified by the RF amplifier
module(lC1). Then it is further up to 110W by the final power amplifier which is comprised of
two class C amplifiers connected in parallel (as and Q7). The signal is routed to the antenna
connector afler going through the antenna switch and the Iow—pass(harmonics) filter. The
low-pass filter of e chebychev type, which has an insertion loss of 0.5dB or less and a
minimum attenuation or 4DdB at the second harmonic frequency. The second harmonic
attenuation at the output of the final power amplifier is 30:13 or more. Therefore, the total
attenuation of any frequency above the second harmonic signal is guaranteed to be greater
than 70dB.
The antenna switching is done by a relay
The AFC circuit consists of an RF level detector, and a temperature sensing circuit.
The RF level detector senses the forward and reflected power. The transmitter output power
Is kept constant by the exciter control circuit which monitors the forward power and regulates
the supply voltage applied to the exciter section. It the antenna load becomes abnormal, the
reflected power increases, causing the exciter control circuit to reduce the supply voltage to
the exciter. In case or an abnormal temperature rise In the power amplifier section. the
temperature sensing circuit detects this condition and send the information to the APC circuit,
these actions reduce the transmitter output to a safe operating level.

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Create Date                     : 2001:05:14 09:17:47
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