BK Technologies GPH21 Portable Radio User Manual Part 4

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Document ID	20618
Application ID	ugTU04o1SB7jtM9Hl0t9/g==
Document Description	Users Manual Part 4
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	151.37kB (1892099 bits)
Date Submitted	1999-01-22 00:00:00
Date Available	1999-01-27 00:00:00
Creation Date	2001-07-09 08:57:12
Producing Software	Acrobat Distiller 4.0 for Windows
Document Lastmod	2001-07-09 08:57:13
Document Title	Users Manual Part 4

THEORY OF OPERATION EPH SERIES VHF RADIO
mammolmlerBadauAumlnIunm.Mmauom mammal-1
meldddamlmmmavcowfiuisam loamhalhvergoloaSmusaamlofi
Wsnmodsls).Tn-bhsminltstaooisad aabylrnpewoomwlcmllmaflr‘nfionin
gain and mm mm mum in: mm mung and w MFOM pow settings.
The prudrivar I: we a class A a r. M ram am new" it amplmas a nominal signal
uuol 91.10 mm lo} M lava M 447.5 cam (49 dBm h I MINI“! iwol oi “4634“ lot
2 Wm made“). Thu anon loo nu variabl- biu ecntrollod by m. pow-r cum! clrmil.
BI-s to mu in MI ampth and saw-nos) la swithed mm 012 in tummn mug. n
It alto lllomd la Emma! man: on ma all». alas In: which may can“ oscillations. In
roam and. 012 do“ ml conduct and a collaclor oi 012 is pullnd law . (ms ramming
all: In 07 and G. This urns 0" lb. mum".
Thadrlvnrisaclaasc rulilhamninil Pain oi ifldBlGdBlnrzwm models). Its RF
rimélvsvizal. pron?“ by warm: I; anvllled lo I mmlnal level 01 (£75 dam 1.2mm»
or mad- .
The final stage I; a class C mpfier. II has a nominal gain nl N) as ("5 dB iur 2 Wan
mush). Ila RF input aural pmvldad by me drivsv In arrpfllad In a nominal Iovol ol {47.5
dam (5.6 walls) lo: 5 m mu. and to 335 am (2.25 mm) for 2 Will mod-h.
B. HARMONIC FILTER
Tho halrnanlc M It a 7 pola alllpllc limp»: liar. u ail-own In. harmonic: mated by
Immamplilhvlniwoh mummwdawmncam . Thainpm anfl ououl
"mp-dances oi the Ililar in do; ad In bl 50 ohm! within m- raiio's band of apafalicn (20
ohm “I1 and 50 ms nu Inr 2 a! annals). The alemsnla whim mine up (ha harmonic
liar IN 687. 038. C58. C70. 671. 671 073.1241. L25. and LZS.
C. ANTENNA SWITCH
Thu amunna switch Suva as a mum» domain—thaw mar-h lcr RF signals.
v- v.
._. 7 .....
Will; Ya l—n
'_E ‘ T“ on
nun—nu-
manna—mum.
l. RECEIVE MODE
m min rmda lh- roe-w I: command lo IN manna as shaman figure). 012
rams ell bias In CHI and CRIS wmm appaar as can circuits in F signals.
Connor-ems c1. ca. 03. cs. and L1 mun mulch lhl new" to 50 ohms
2. THANSMIT MODE
In mm! most in. lunamlmr is command to tha manna pun u showman
n). 012 com lurnm on cm and can. Blu cumin i m by 552.
0" mm: 01. 02. C74. a u men mama-me omnoihhannonitiiulo 50
ms.
0. POWER CONTROL CIRCUIT
The powor corlni drum mm m. sum mmm h m- powu mlilhrs final silo-a.
This mmn ll nully p Ional n In uransmmr output power and is lam comm by (no
pawn! control In enter in val mm new-r.
Thu mar neural B Irwin-mad ii lwr my
9». 4-4 IBM
EPH SERIES VHF RADIO THEORY OF OFEflATIOl
1A Sum cum"! is unud n m- !inll luv-I0! “i A we mll'nnm muster (Hill in m.
wunnmmsamhflahmmmhmmwulmmwmm,
1 An munch-cs is mm with m cum unl- voila me no FWH savanna.
This a wish“ In a rumor bridpa.
3, Th. orrnr in“. is awed m in cum amplfior (I3).
4. mannflmmmmmflohmwiiymmnwm lowicvvlandpudrivov
l I murmmwswmmmanFETthflwlywnpflfi(Ofi)i navamsmeqm
an gas.
01
V ' mph hmmmmmwmmmflmmsmmaflm
fifil Tran-and-Mcflwmlunmavmmamwaonvmmmrn
t flag .
4.3.3 SVN'I'HESIZER
Thu pumas: cum hesizer h In swan an RF signal ulnar |n mnvm a flair“ twelve
lroqucmy m I find I as] MHz) or m mo mm. Thy mum-in! is usanllnily l phiu
Ina-d bop 1m lode HF out” of a mum mmllnd minim (VCO) in a vory slam m
frequency ram. Th: mmr dmflnim mt imam that me gymnasium women by
programming ml when main“ mm in. wan-sin! IO.
U"- MID
mint-her Block Dlaanm
A. VOLTAGE WED OSCILLATOR (V001
Tram-m 04 pruvidu ii- gnin ma In L-C mom link amul pmvidsl m- twenty
“"-‘u'""- a” " "“ ’.":'uy"‘u."“-m“° m’mm 2“ “£522 Jmmmifl‘
ow nor n m u w e
"ll-1m TI In m cm and CNS, cm is wild no luck mo vco lo M Sew-d
cums! inquenw willie Gas is um h In "mini! mud- |n mm- the earner. The
oscilmrimpmcy is |‘G~|7‘ MN: in in. mmn mod- and 131 .1-|57i1 MHz in me
naiv- M um um um). Tm 10.9 MN: mm (mm inf-ml! m ran-M a named by
rumin nnP died-c Armsmumnammm Ofilmusocmoddmalry
additional mar s misting lot in: VCD. Diode one was me illter a tsp-d
power to mmnn mil- in: min; a very low null Mammy.
B, VCO BUFFER
The vco m1 Is I enscom eomlmrlion Min blpolar mm: 03 reading mum gen
PET 021. I Minn In. VCO "om mo mint/transmit!" cirunry «a pawn»! 0mm
pmrfibsmnmmuiwelmamhuamammnmmit
CA PHESCMiR BUFFER
Pascal-r Mar 02 puma“ isolmn bum-on tho mm and mommanunmor circuitry
m mill Holmfl between 1h. mm! ltd VCO.
Mm Pogo 4-5
THEORY OF OPERATION EPH SERIES VHF RADIO
Dr PRESCALER
Presceler 11 l Is an emitter coupled '_ device which chides down the HF slunel video by
the prescaler Menu e frequency w cen be emceeseo by the lellowlnp CM s More.
The presuler n at the wet Mira type which elows the olvloe velue to be let by the
eymneetzer IC Ill eiher mete-W4) ("callus control llrre men) or dehby-M ("Bali‘s
control ire lowlt rm; upeblllty slows the RF s‘qnel hemenw to be divided by integers tfat
are hot multiples ol eiher 40 or 41.
E4 SYNTHESIZER IC
Syntheelzer chip [12 contains three program CMOS Men. I smrple—end-hold phase
detector. and en armlltrer which tonne eh on-ohg‘relerenee oscllelor when connected to the
terminals or on enemet cry-ltd (Y 1 . The t driver (Me-by-R) amen down the
reference millator to e lrequency ran in used ee 1 reference by lhe sample-Whole
phase detector. The seoono elvieet (oMoe-oy-N] olvloee down the outpm ol the preseaIer to
a “gummy writer rs equal to the arm down Morena lrequency when the loo Is locked
The “re a vice! (dlvloe-by—A) oorerote the rrromlrn control line a! the preecelel. semple-
eno-holo phone petector provides e no voltege met In proponbml to the phase error
between the drvrded down Merenee end the Med down oerrler, T'hls voltage is led
through the loop tllterto the VCO end must: the vco lreouency In e olrealon to melrrleln
pheee enolrewencylodtbetweenthelwootvldeom slgnele.
F. REFERENCE OSCILLATOR
“m“mWT-wr "mm." u".2’"m“°° r ‘ ‘°' ”I” "" m'mmm’ "3
tr: ’ r n we es . ose etor ue econtro
rcl wilt-kn operlteo Int perelleeldrl‘eorxlt mode across on Mr llt Immo the eybrzmeifer
. eoryetalrsoompehen o sormrnusSppm a rereeomoerlut
clrml bu. around transistor 01. thetrrllslot RTl, end motors calmer-rd CRZ. In addition?
rnethoo or rrrodulltlon I: prevkleo to Improve the syntheslzer Irequency reopen-e to low
trememy modutnlon.
G. LOOP FILTER
The loop ller removes nolse and unwanted lreqrehcy oomponente from the cum 0! the
sample-mom ph-u deteflor which would otherwise mourn. the vco. It employs e
rmhple lier oenomoth oosim whrch dlows test response dunno lrequency changeeGSsueh
as In cram-r Scan) wlmm degeting the noise and e rteus penumenoe the
symheslzef during Hm state receive or lrmsml oondltlohl. he filter to wished to e wtoe
benmuh oomh when the vENABLE BIG line pulses Non lei eporoxrmete 4 msec
out a fro erlcy change. Tl'u allows the new lreouenoy lo he related wrdttyt the
QM BLE B G I'l'te return to l!- low stator the filter behemoth oranges to e runow oorrdltbn
and Ides Io! good note and epurleue oeflormenoe. Flnelrj. dflerent filter bendwlahe ere
ue tronr trehemlt lo receive no pmloe better hum eno nolu penonnenoe on trammlt and
better response tlrm on resolve. This i aooom ieheo by mine the tllter behemoth to a
narrower value when the -TX BIG line goes low mu commit.
H, ACQUISITION AID BIT .
The «HE BIG shall summed with the synthesizer IC phase oeteoto output prior to the b
r .
tiller helps to keep me phase oetemor operetlnq nearlhe midde ol Its range. Th‘s bit ie
tor the lower he! or ellhef the receive or trlnsm bend. and hlgh tor the upper he! of
is
é
Page 4-6 ammo
EPH SERIES VHF RAOIO THEOFY OF OFERATION
114 SVSTEMS AfiEA
A Villlly of Iundhns It Imlum In In; gym aria.
A 5 van on who. woman" pmvidgs pawn in m- mlcmgrumnr and slvunl om" ICI In "I!
India. 41557 signal Iron 1m: awn wil mu functions i! In. hm volnqs Ills
webmmazvoltmumluummsymmu Vconmmns. Moutpuls Ivy-Hahn
m. pmcamr I ma balmy who: Ialls Inc In ror your cur-Inn.
Swim small mm "mm m Incl-maid by m- miwopruasscr. The“ run- nonm-
M-amund. channel lam. DTMF quorum. ANI alumina. sub-autism Coal Guard
utmralbn, and me out timer.
Roam rrom eclil mun: province th- m'cropfocusor hands channel scan. pmlIIy scan.
mm min flmrfglnaq saver. and tone waldo“ guard meow-u.
0mm tunabl- unarmed by m- mu; 1 am symms‘mf come! and am loam. enamel
and harem! Iriormafion wage, Eon of a receive! ma ma luring voting, irmmmaliun oi
mu ustf Mann. qmlrallon oI dIspuy Imam-(Inn. and mum and “you p'ogmrmim M0.
A. MICHOPROCESSOFI
m we.“ (II) mains inpus Iran nut when“ and controls ruin fundiom such
as loading tho mull. winning In. Iran-mum dlvlamn. Inning m. roe-Not. mung
mnsnll powlf. “me out Innalum. m
B MICROPROCESSOR OSCILLATOR
Thu miavpmelmr osciIImr comlm m V . R02. C45, cu, R08. H”. and 022. The
frown M Winn can In mm sum” by 022 In rnvm inen‘enmu Wm tuned In
new. c Is that an exam rmlfplns of 6 mm.
C. EEPROM
The EEPROM (I7) Hem chanml Hun-(Ion and "1mm norm-nation “was. It is
NW oil In conserve mm by 013 wmn not "n usa.
D. SIGNALING AND SWITCHING
Tm swung DIA and MI: nmm canal-u cl HNI. IA. m In, This circuitry allows
an mmu-w lo gamma TMF and ANI Inna. luv-ml cod. guard. and various audle
Mops hum in IN snow.
E. FfiONT END TUNING ANO POWER SET
Tho Iron and In an pom-r so! DIA comma: Is_ cums-u o! a um! Int!“ room-1 u)
a ram mm m) and anvil!" m). In new. and. tho voltag- from Nu m u to
woo In. Iron and n on m- Rx/Tx board. In Innsmil mod. I II used w m thn trlnsnfiflur
wan
F. 5V REGULATOR AND LOW VOLTAGE RESET
Ia pmvldn l mulued 5 veil nwly Io! m. min. An out” sign-I Irom thn nqulam will
m. the mm”: Into n and caravan I I"! may vang- drops below about 5
s.
G. 01V HEGlLATOR AND LOW BATTERY SHUTDOWN
An 02 vulregllta beompoudwfn. 010. am!lamina-chin“?ts Rngullmopcrulon I:
mmmvnon. Th‘mnpru-mrvdmmmbzcm nlawmory 015.2
vansnoflawnoccuu. Ildlluudmmid’ll’flrlwlmnroil mmerynvumae.
52mm , PM 47
THEORY OF OPERATION EPH SERIES VHF “ADD
H.
RECEIVE AUDIO
I9 is A 45 Will Mio impliifl. m it 00mm by“ «Scream! vb G16.
DEVIATION COMPENSATION
The mm mm" davlaflun mun-union netwom cousin: 0! H4: (nru HAS. Al Norm
"annular Irequmu-s Ins who. i mop-d Io: vco mmlaion. so In: circuit mun-m
ma aw. Also. whun wild Inn“ Ill um (qr-mind. m. mum unsiflvfly is refine-c
by lpprvzimtlw 157.15 mm SKI-I1 pad: civilian II ml Inn-$64
CHANNEL SWITCH MULTIPLEXER
The dunml much Mphxar (IS) allows four Ems In m. ample-2m! be be shared
Ween (no annual mm. In recera rmda. me chums! samr 90m Doubt! may
be unflnad m 15. In imam! modt. 5 I! used In momma m- dunno! men mm lh.
microprocnw n that In." sign-u may be us“ tonne dovillon coupon-flint! clvcukvy.
SOUELCH THRESHOLD PHESET
Pin 1! dEBquwmlmmermmm minusbwerlngmnsqunlch
mus-mu when the Squeluh knob II In In: ‘prasar‘ mason.
5.1 INTRODUCTION
SECTION V
MAINTENANCE
m. mas-mmwmutm
mAn
Th“: “Momma snctbn annulus ma ma llgnmmt woe-dun: lur an wanton-I EPH Satin
Wind WM
uni-manila d the (Mary at opuralion is "comm-d Mm malnananw us ant-mam
52 TEST EQUIPMENT REQUIRED
A. HF Slam! Gammon Hlee or which!
B. Bitumen Maw-av: HPIMA o: Mal-fl
C. RF Venn-ml (optima): 509mm sec or equivalent
D. RF Parlor Meter. HFGSB mm so a pm or cum-lam
E. Samba Monica Ola-hm 4000 Run Cumuvicnlnm Test 501 or OW"!
F. DW Mum-r: Fluk- mu or mm
G. Pro n emanation rain mm and
warm- (hr mmmmmmrfim OW
H. Wen IBM PC or mm". Mm ZSGK mm an! m IRS-232 tonal pen
M705 or M725 WWW ubi-
EPH mun-no, prevail-mm mum.
EPH RXITX ”in: small
I. WTOGI Kl WOW. P/N 050025974000.
m- Incl kl comic d I. m pins:
Amnrml MW Key 0474197540000
Bathry Elam 071 050310000
Spin. Wrinch AB 0710611941000
Sm , on-oum moo
AW Tm can 1554220041000
RF Cabin Mum tss-ozzes—nooo
Audo 0th MGM nsamawooo
J. Tm Gibb Kit LAMS“. PIN 050427670000.
mmhumdhmm;
Edi-9h I'm a“ 155462841000.
Tom IMW cl“! 1 554mm.
Mlle-w “Emma 8“ 155-085-0000.
RF m mama ”I 155025534000.
w 00“! ”It 1554125374000.
pug-u
MAINTBaNCE 5?“ SERIES WF RAM
5.3 OVERHAUL
5.1! VISUAL INSPECTION
Th'u union contains instructions 10 ssifi “m dmnnin'no. by hspeulnn. (he cnndllnn d EPH
launch; Dena: muting Item will. lbs] may. mm. 01 other we: can be
gamma, Imam" pron-mos. a w hum drill-u moans an arranged h
or.
A. CAPACITORS, FIXED
Inmmmhmw.mmn.wm¢hmnurmm
imulnion. Crack for but. WA or came mminll Ms. lugs, or Ina. Imm tor
loo”, bfukln. at in My said-rod 00mm. On chip taps in lspocillly film for
hamlne crusts “n the and human mminafins.
B, CAPACITORS, VARIABLE
Impod trimmm lor chipped and amend boom. damn-d ail-ms and damn-d
C. CHASSIS
Imp-a in dual: Ior damnation. m. punctual. mm sulfaus.
commas. mm mm! mu, loose or "filing re. component com: 11,
w dam no me "mm.
DA CONNECTORS
Imp-ca comm: In! mom pans. and 00m imwhviflu. Imp“: Our mud or broknn
Imulmhn and for was ma: It mum mar M of album “MET lav
mmdudardlmoamonoo s alumna-um. re n.or
sound-d mar-Ii com-alum.
E. COVERS AND SHIELDS
[mood cow-rs and SM hr mm. C. Stilts. N m m Mun. AM, M
for damaged tau-nor m. corrosion “mm. to mun. y
F. FLEX CIRCUITS
Impou Mx awn mr pumas. we may mm mm. Chm lo! broken "lees.
unduly now in saw some: puma.
G. HJSE
Impouforblown lust wmmmowwnm.
EPH SERIES VHF NADIO MAINTENANCE
Hr INSLI LATORS
Impala mm lot whorl:- a! dunlgu. men is bulk!“ or ehlppld “all. hurled an“.
and pregame ol broign man-1.
Ks
JAC
mud all use lot mnnmfl. mrmuhns. loose or bmlmn pm, crackle lnsulnon,
contact. or all-r mogul-nit;
J. POTENTIOM EI’ERS
Imam: a! polcmlomflars lor Warns of dame. or be“ torrrunals. cracked insulation or
Wm mama
K. HESISTORS, FIXED
Impact m- ill-d mitten lur mama. Drona. flawed. of dilfl'd India an»: Icon. bmltnn.
or hump-fly soldered comedians, On clip rams b. mlly alert for nailin- cracks In
1m bow and mm mm.
L RF C01LS
In 3! HF cod: for bunk-n mm. but: mnflmm hm. imp'upcrly sold-rod. or
an mmlnd ewmedlcrru. Check lot Quinta w . an or arr-nod windings Impecl
the WWW, loam. lam-Ind; and counselor-u lor cannon or mum! dam-om Chick lot
physical damage Io lorml and Dunn slaw alumni lam.
M. TERMINAL comecnous SOLDERED
1. Inspectlorcold—suumorrnln'm,mesa ‘rns “ma “mall-mush
swam-x. shahrmmgwwuwgeJ-nfiM-m
2. Examlns the tam-“rah lor “as: soloer. prumslnns from th- jolm. places adharinq 10
amazon “muffin. am pm: lodged mun 1am. common. or other
com .
3. Impact lav lmmflcbm sold" and umm wand: 00 win pvotrudlng from mm at
tho mammal. Cam in: Insulation that Is stripped and be far from rho tom.
4. Impact in: wanton an m. (urinal
N. WlRlNGICOAXIAL CABLE
Inspnt wiring In chassis int hum h Imam". continual brads. an or brukan laclng and
WWMsmmm-mmmmum.
ammo F». H
MAIN‘IBMNCE EPH SERIES VHF RADIO
5.3.2 CLEANING
A. using a nun. IIm-lru sun my manned uh soup ma um only. roman m. Ionian
my llorn tn. mun-m use and um: "on! pm. Wm. dry using a dun. dry. lint-Urn
B. uslng I and enmlltd dy air in! [noi mor- mm |Spsl). blow tn. dun horn Massimo
mas. Cmmddnhmwmmwnmbymaairm,
c. Clmmrmmflnamuwnwmahmwmfldu my mmcmupmjnd
“ErmJlchmugmmm-mmmmwgmrg' tdrywliudunmry.
mm.
5 3.3 REPAIR
Thll "won dncflbn mo vacuum along with any spam (m tor noticing damagsd or
MlflM comm;
A. CONNECTORS
mam-announwnnwuxmmvymmm
tmmmlmwmmflqammwmmmnmm.
B. CRYSTAL
mumuuwvaasmmmmmmuwnm-dmumm
mm
C. DIODES
Us. long mu pllmnlmumum-rmmalmanabm mum-diode
pol-m nutcr- uncut
D. INTEGRATED CIRCUTTS
mama Alon-Mind rmlmmmmns.
E. WIRINGCOAXIM. CABLE
wmmmid ammmmounmmmmnmouwumrwpmm
winmmn M.mfiptmfinnmeneeuug.lsmmmmvrmtmmm
ww.flepuuadxmmm0rcnnm0nam mmmzownngm. '
Pups-4 mamas
EPH SEE! VHF HMO MAIN‘I'ENANCE
5.4
5A!
5.12
513
DISASSEMBLYIASSEMELY
BATTERY REMOVAL
Tommmumvyp‘ek. Mum-mo" mmmmmonmmmmwo
mmmwmmlmacr memepadflmmmemdlo
UNIT DlsASSflAH-V
human m but lam: "ammo min mew-r (In. lid. mm. In. ”any grill).
mnwm sum mun-gm: manlnksnlofl lath! narcommd lemma Nut
5 n .
Loom In ”T hourng mw Ind “want the mm! eon! 1mm the mam lurno.
OPTIONS BOARD AND KEYBOARD
A. Dlsmnmfl m we levee mam mnnsmrJ m) from th- optbm beam. by m ma
commute” hwldlhflopollm mm. m Blows mm unblo ”unplugged.
B. RemwmnmsMammmum-mmmkmm wmumm
mmnpluonumm
RXITX BOARD
A. Unlusmn In. lhm manning q: mm M “um tho RWTX beam b m- rnlln lum-
a. Camuly nrmn m m coax mm m RX/TX mnnsanr,
c. utupontm mmwmsnmmmmmmmw,
SYNTHESlZEH AND VCO
Home the screw and unsold" I'll S w; lhll 3mm 1m Syrlhniztr fill“ an m- sysmms
baud. nmmmwmmmsmumwmmm
TOP PLATE AND SWITCH BOARD
A Rln'mo no channel uhfi. mm. and In Mn mm.
B Hem in mlnlnp r-mm horn 1h. annual sol-ct with. mm. mmol. and the
squolal coml .
c. mum-momma naymmm-mummpum.
D. mm m rnalnlng Manet! lmmlht ml: “and tan, and pflorlty ”mm.
E. ummnmlwummmmnmwp lramo mammmmm
mmwonhmdmlfim.mwm magnum-ham
mmmmmpflmmm.
F. Umoldu m- llllo in: win lmm mm hem lee-Inn EIS‘
ASSEMBLY
To assumi- m unl coup-h tho hamm- ln mum and-r.
mm: Pup 5-5
mm EM SERIES VHF RADIO
5.5 TEST AND ALIGNMENT PROCEDURES
55.1 TEST SET-UP
The radio should be mum with 10.5 voc W from in warm pow-v supprm and In: mm!
ammh Shall be “1 uh .
Channel Selacmr: Chan-l 1
ONO" Vow-no: On. Volume mInfimm
Sunder/Morin Unmlehod. Fully demiu
W I Low mm HIM pom:
Sun: 0"
Funny: 0"
Emmy Saar: O"
ThomsthmmdhawnabhmnWMgmadmm-suppmocmint“
mummdpmmlupmy.
new In Mn 5-2 and H lor Trummmr and mm: am 3“. mu m M m.
nan-c- bmtn mi mun-n mu m. radio. “0,
5.5.2 SYNTHESIZER
A. ' vcowusmaw
1, Tha vldh shout!“ BMW-6mm us “1174 MHz
saw-mhlnmmmIflMI-u
Com-aammunaermmfiiwmgroum
WT! hvaumwerzovocmmsymmsmmm.
SCI IN MIDI!) mm at 17‘ MHZ. mung- ll "WEN lhlhbl Ills than 7.3 VDC.
supp!“
‘ BA REFEflENCE OSCILLATOR ADJUSTMENT
1. Connect tum mnflnrmth-umoflhflmm.
2. sum-rfibfuanyvsd transmll mummy and mm: m rmnlbrm mum on
this lraqnncy.
3. “MMsramafimcswmewbmlmmmm selectad
mm zoom.
C. DEVIATION ADJUSTMENT
1. mmmm-meuwlom fiFhwjnfltuIm-nrvbomn'mr
a. commmmdumhnwmdmmmrwmnMchignlnpulofmrlfiio‘
Comm difial rml‘tmnvbmonlw 1m mu! vol-994
1 mllmmmmwmmmwnumwmsvans-"mum“!
4. sq! th- urviu monitor 10 mm (his lunch“ Matty.
5. mmnmmm-mbmeMamrmm rungs.
6. IN hammer lflfl ml R40 0“ If“ I “I". m N m . “Wm“ mm M
m RH! on “D ”Nt- mm. 7
7. Chuck m. “vim" “Inn on III on" nth-”11mm! Inga-mus. On Imqucncy
whmth. mum-mm 5 kHz. ammo Muc- Iho muons? kHz
Fm 5-3 m
EPH SERIES VHF RAM MAINTENANCE
5.5.3
NOTE:
REFERENCE MODULATION ADJUSTMENT
1A Adm m. amnion mom in! "am the anti Mo! to 0 volts,
2. Kay mi trauma and abs-m mo rusul'mq mm on m. 5mm mmibl ulmlly
3. nammemwwwmmeflnmmvmm ass-“tn. Amolu
|o “balm p p
4, Hmm m: modulation up)! lav-I 0mm 0- umne monitor“: 0 15 VRMS. and radius!
the «whim 1 many
"I
“A“
FBURE S-V REFEHME MOBULATION ADJUSTMENT
YHMSMI'ITEH
Mjuwnoms 01 in. Man and low WWW 3mm. as mil as Ihl "CONN lunlng
mums-I who mm using a mm. EFH mm m"?! son-rm m! a programming
can. sown: mum am 91°an m IN EPH Tm 50mm Mull.
HIGH POWER ADJUSTMENT
1. CenmflmfiFmrmm-nnsooml haunt-e RFomwlslueomeaor.
2. 5-1 on male |° 1h. WM Ivfilfib mnsmlt mm win high will! mam,
3. mmmm-wmmmmmn
A451 m- mmmmev mu m using a annular, EPH HXITX Tuning lam-re.
an a progumnlng .
5. Rncum-Memmusmhm
s. amarmmsmnmmmuux. hamth-Wmflmlow5
LOW POWER ADJUSTMENT
|. Connect mo RF pow mr and so ohm land ln ma RF cum mo eonnacm,
2. St! ma rm to in lanes! nil-bl. unflnn hwy with low power mum.
3. mmmuwummummr
0. Ammmqfl-fluwmswhguuhgieummnfiPHRX/flnmlngmm
Imam-mm
mnummumwwmum.
5.
e Rot-stat ndnnurmufiwmINMHz. smumput unduly-114
wanna. Wm. Mi“ W
ammo PM $7
EPH SERIES VHF RADIO
l A
ll 9
v e
I C
H I
u I
A 0
nmm
MM“
FlaunE 5-3 men'ran TEST 3570?
mm
Fug- M
am semes VHF Mom MAINTENANGE
TRANSMTI’ CODEGUARD
VODU LATION
‘RANSMTI’ AUDIO
MOD LLA'iON
RANSMTT F? EQUE‘JC"
ADJUSTS TUNING VOLTMEE
(N0 TUNING REQUIRED)
mu WW
MAINTENMCE EPH SERIES Vlf RADIO
AU D20
SOUELC H
was
ADJUSTS sznsmvm
(m. cons)
HIGH—END
sensmvmr
(no-r cm ALL BOARDS)
Fig. 5-0!

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