PHOTOFACT?® with For Supplier Address See PHOTOFACT Index. NOTE Repait or ajustnent of ernst cents most be under Iervsion oa perion with fistor second-class radiotee phone Heese Teter to FOC Rules and Regu os Part 95, Subpart The frequency of the tranumier shoul be chackot pil ho cory queasy nando to ise proper and gl reation ‘Best suis wil be obtuned when adjusting the fn RE utp Picutt the emenan norraly ted conseted andthe chasis Shar inthe cabin! a posi, ‘Connect eit S-ohm sommy Sead or the normaly wed antes pectin OnE TaBorL HOWARD W. SAMS & GO., ING. tnatanapoite, maiana 46206 1070 Howard W. Same Co, ne. Print int Sot Ameren SCF966 ‘uosel TIGOW vusOD> DELETE - ALIGNMENT INSTRUCTIONS. TON Use Isolation traneforacr of observe polarity when connecting test equipment, iaintain line voltage at 120V AC. Allow s IS-Rinste warm-up period. ust AYBOL foe 135 outs Oe at 4P1ze ides ‘equipment to ground wiless Specified otheniise, Connect Sovohm dunny Load of antenna before keying transaiteer. Connect sicrophone, Suggested Alignnent Tool: LyL2,L4 thew L10,L12,L14, 429 thru 125, 150,131,145,L46,L47,148,159 15,113,118 136,38, or’, 6c ELECTRONICS: 9440 TSI 5000,5009,8276,8728,87284 [1 5009;8728, 87284 5000,8276 SYNTHESIZER ALIGNMENT TEST EQUIPMENT TRANSCEIVER ADJUST REMARKS lrnput_ of frequency counter to TP13 | ch. 19 JCueck for 10.240¥2. ich Pin 8). linput of oscilloscope to TPI0. ch, 19, 4 1a hrdjuse for maximum RF (3.4V rp typiens). (See Fine lnput of vc meter to 1P9. ch. 40, aM has laajust cor 3.2 volts. |cneck for approxinately 2.2 volts on channel 1. linput of oscilloscope to TPL. ch. 19, aM 120 hhajust for maximus RP (190A lp-p typical). (See Figure fe.) input of frequency counter to TPL. | ch. 1, AM Ls \just for 34, 7650Ii2 +2082. [creck all channels. (See Truth Chart for correct Jfrequencies.) linput of frequency counter to TPL. | ch, 1, USB iso \3just for 34, 766502 +20II2, frreck alt channels. |isee ‘Truth Chart for correct lrrequencies.) jinput of frequency counter to TP. | ch. 1, LSB wae just for $4.7635MN2 420K. heck all channels, (See Truth Chart for correct lrrequencies.) linput of frequency counter to TP10,| ch. 1, AM hock for .790Hi2, Check all channels. (see Truth chart for correct frequencies.) linput of froquency counter to TPIS | ch, 19, AM eck for 7.345002, reT1 Gate 1). linput of frequency counter to 1P3. | ch. 19, USB cm fajuse for 7.so1smte +sit2, [oie linput of frequency counter to 13. | ch, 19, LSB 130 \Sjust for 7,798SMiz ote, Sie. Input of frequency counter to TPM | ch, 19, aM XAT Li bisconnect TP7 and TP8, ICS Pin 3). \djust for 7,000.82 +52, linput of frequency counter to Gh, 19, A Xr vas just for 27, 185i, pintenna inpue.RECEIVER ALIGNMENT x nae limiting. RF Gain Connect an AC VIWN or AF wattneter across speaker voice coil. Adjust volune control to obtain # suitable indication, Preset controls as follows, unless otherwise noted: Maximn, Voicelock Midrenge, Squelch MINIMM, NB/ANL Off. Set generator output ow enough to prevent pola? to antenna input. far. iasitiz, 100012 0 30% nodulation, Hinput of oscilloscope to TPL7 (02 rathode) TEST EQUIPMENT TRANSCEIVER ‘ADJUST REMARKS jatput of signal generator thru | Ch. 19, USB Tis, 112,110, [Adjust for maximum output. [fo1ur to TP16 (TRIS Emitter). 19, 8,17 f7.8i#i2, no modulation. seput of signal generator thru | Ch. 19, AM Las,t15,13 faajust for maximum output, [oluF to TPLS (FETI Gate 1). iSskiiz, 1000H2 @ S08 modulation. loutput of signal generator thru | Ch. 19, AM 16,15,t4 — |aajuse for maximum output. JO1uF to antenna input, 137. 185t4i2, 1000Hl2 € 30% modulation, yutput of signal generator thrs | ch. 19, AM nw lset generator for 10d sige fnai to noise plus noise ratio of receiver. Inject la 100pps, usec. pulse width lsignal at antenna. input. Igweteh noise blanker to on jand adjust for maxiaun pulse larpiitude (8.2V peak typi~ Jeal). (See Figure 3.) RECEIVER ADJUSTMENTS [Connect an AC VIVW oF AF wattacter across speaker voice coil. Adjust volume control to obtain @ suitable indication, Proset controls af follows, unless otherwise noted: RE Goin Maxim, Voicelock Midrange, Squelch MINIMUM, NB/ANL Off, swoerl T3G0W vus0> [OluF to antenna input. 7.18642, no modulation. jutput 100uV. TEST EQUIPMENT TRANSCEIVER ADJUST REMARKS, jatput of signal generator thra | ch, 19, AM ves Isquevcis RANGE [-o1uF co antenna input. squelch | Maximan Jaajust so squotch Just 7.185Hiz, 2000H2 @ 304 modulation. lpreaks. nutput 10000. ystput of signal generator thru | Ch. 19, AM vRL lat STONAL METER OluF to antenna input. just for 9 on signal scale TeSMete; TOONS e-Soie- mode f moter. jueput 100uV. put of signal generator thru | Ch. 19, USB vRe SB SIGNAL METER sjust for 9 on signal scale f netor.~ TRANSMITTER ALIGNMENT (Connect a S0-ohn, 25-watt dumy load to antema connector: NOTE: Be sure tO check transmit frequency and pover on ail, See page 4 for channel frequencies. active channels after alignnent of TEST EQUIPMENT TRANSCEIVER ‘ADJUST REMARKS Hinpur of RF wattneter to antenna | Ch. 19, aM 147,148,146, [adjust for maximn RF out- finpuc. 145,138) ut. linput of spectrin analyzer or ch. 19, a Ls6 [Adjust for MINEWIM at Saisie iarnonic neter to antenna input. (2nd harmonic). TRANSMITTER ADJUSTMENTS Connect a S0-ohn, 25-watt dummy load to antenna connector, NOTE: Be sure to check transmit frequency and power on all transnitter. See page 4 for channel frequencies. active channels after adjustment of input. \djust $0 RF PWR meter grees with RF wattaeter, iN / Y AA) \ NAN FIGURE 2 AIM FIGURE 1 San FIGURE 3‘TRUTH CHART ¢ |i = 8.00 volts O= 0 w 0 Vals Hi A ta X PROGRA DIVIDER avsee | use nec | use nee ut sym | suri | sui | onvnoen E PINS OUTPUT: ‘OUTPUT. ‘OUTPUT. TNPUT t Tne ar | Ghote at | Gw'hws ar | IW ae AT wo [nv re [as Jue [as as | [om in wa 10 rte tei: tate de 4.7680 utes | 7 2/1 fo ]i joao fa R180 ns | Slt fo fi jojo fos 37080 7698 ali fo fi jofe fifa 38080, wAe038 s{t fo fi jo]t foo Beir) Bens lela fo}afofr ofa 0250 wes | 250 yi fo ja foji]i fo 6350 Mans | ‘860 eli fo ji |i jo fo lo e380 ise | ‘om B\i fafa |r fo lo fa aa‘esso | 3eleces | 3eleess | “290 Rofl fo |i |i oly fo wero | Sere | Seems | 00 niafo fa lite} |a va.seso | 34.0065 | 34.0835 wifo fila ]i ofa warsoso | 3e:906s | 38-9038 Brfs fi lida fifo wise | scsies | ast35 wifo fi fafa jada uses | Alses8 | 3Alse35 }1 {1 fo fo lo jo fo wirsoso, | aesaies | 34.9538 8 is} Jr fo fo fo fa fo sa.osso | 34.9565 | 34.0535 3 Wat i fo fo fo fi |i shoes | 3alog6s | 30.3638 5 he}t |i fo jo fi jo lo wisrso | lores | alsras Hi sya fi fo fo fy fe fa mises) | isos | 3e38 z o)1 |t fo Joya fa |i seco0e0 | loss | Set0038 8 lnjx J1 Jo Ja Jo fo Jo ss.oi0 | 35.0168 | 35.0138 e ee] Ji fo Ji jofo]d wines) | is.o2es | Hec0e3s eS fa) | Jo Ja} i fo fo ae.0ss0 | 3esoses | 35.0538 3 fs]t {1 Jo Ja fo la fo Siose0 | Bsloa6s | 3510895 g sli Ji fo fifo la fa siowsd | Selous | 38.0038 # sla Ja fo la fa fo fa ss.0650 | 35.0665 B}i fi fo jaja i fo s.oro | 3.0068 Beli |i fe fila fa ft siooso | 35.0068 ji | a |% Jojo lo fo loos | 35.0068 ee Cc seit0s0 | 35.1068 fa fa fa fo fof fo asso | as.mes | 5.35 Bela fa fi jojo fila silo | sis | Bie Ba} 1} i |i fos jojo geinaso | ascta68 | 3s c1335 Bi fafa foji lo fa sectaso | 38.taes | 31435 5}1 }1 Jr fo yi sr jo 35.1550, 35.1565, 35.1535, be} |a fa ofa fafa s.jos0 | 35.1665 | 35.1535 Blt | |i |i fo fo lo ssid | s.t7es | B38 fal? | 4 Ja fa fo fo la sejeso | 3e.u06s | 35c038 Belt |1 Ji fa fo fr fo Bist | aeitoss | 3s038 molt [a fa fa fo fa fa siasd | as.20ss | dsizoas | 1-280 SHIELD LOCATION[A Weward W. Same Photo ICHASS1IS-BOTTOMORIVER FINAL S-RF BIAS. 7.8MHz BIAS 27MHz ‘CAL ALC SSB 54M Mi Hz IN) 27MH2 27MHz [veg vac] [vars] u | 15 27M 455kKHz 16 AMCARRIER POWER van aMHz Lio BMHz qiseet WOW WaEOD [rea] fuze fn] vR2| Lao AM XMT —_SSB_ CARRIER SIGNAL FREQ SIGNAL BALANCE MET METER TER 7.8015 7.7985 MHz MHz CHASSIS-BOTTOMIMA IN BOARD. 2 TRIS: TANG R37 TASBTRIS TR26 TSSeT TGOW WEGOS MAIN BOARD 13MAIN BOARD TR33 TRAB TR30 TR29 “48.14V NB C258 R214 0214 8.12V-AM. 7A Howard W. Some KERSTIN Photo e > lz e oo MAIN BOARD[x Howard W. Same Photo MA IN BOARD 16A Howerd W, Some ERSTE Pate TOevI GOW VEEOD MAIN BOARD 7‘A Howard W, Same Prete MAIN BOARD 18A Wewerd W. Some Prot TISSTT THGOW VEHOS MAIN BOARD 9vrdo2 S406 S463 $407 S408 S404 vRdoG vR404 Sdo5 A401 CHASS|S-BOTTOM 20TosvT dow VaEOD TRS TI TR2B Res qa. Th7 163 TR32_- TRG TA31_TR25 TRIS TRZ4 TRIZ MAIN BOARD 2Cis cii9 C120 cit4 C124 C123 C122 ct2e ize Ciz5 MAIN BOARD 22COBRA MODEL 148GTL 6223 3 6 6 3 a & cao t32—tas—C5t 36 MAIN BOARD 23C132 C170 CI71 C169 187 Cts C168 C2 cir C9 C8 C6 C7 Ci C101 C107 C208 C105 C102 C104 C103 MAIN BOARD 24C156 C195 C153 C152 C151 C149 C150 C148 ca2 WOerT AoW VEEOD MAIN BOARD 25posh RR RRS RB T a RBA. 5 RB: Mn Bt R93 R82. fe R36. R79 ae Re0—_ Ag R35- A132 832 R133 R23 R134 am Cans R33. a7 A3t —a19 R34: R121 RIT 122 a6 R126 Ri Nata Ria af2@ AYO oAti2 A120 R118 Rd1 RMD RAT RAZ RAO RT23 RIZS IMA IN BOARD 26COBRA MODEL 148GTL R256 R254 8 = 2 R76 R39 7 R26 R21 ws R39 \ R67 R257 R259 R24 R22 RBG R25 R29 R28! MAIN BOARD aIMA IN BOARD Aigo A181 R160 R161 A159 A170 R195 A228 R194 AI93, R154 R155 R156 R158 A130 R127 RIT 28R142 A238 R140 R141 AB AIST (RY35 RIAD RYT4 R143 R137 R147 R173 R236 A239 ATBT —RIBB R203 -AT46 MAIN BOARD) 2 Tosh! WaOW WaEOS076 p50 p49 047 048 p42 D67 DIG D—B Dj3 DI2 045 O74 DEG 06 pu Daa. Das Jo 69: 58 032 033 035 052 75 p51 036 037 038 041 p40 039 O11 060 MAIN BOARD. 30Rehan a Gireuity not used in some versions Ye Nominal vive Common ve point tem numbers in rectangles appeat in the = Grouna ‘Signe’ path ‘sigomentagjustment inetuctions the Chas “Sp Voltage path ‘suppiy voitage maintained a8 sown at inut (© See parts st Voltages measures with sigitl mote, no signal Waveforms and Voltage taken in Channel 19 Controle advstd for normal operation ‘wth switehing in receveunioas noted ‘Fermin ientitiation may not Be found on unt Resistors are 72 or lea, Sunless noted Valve in ()esed in some versions Darrow head} at cols an transformers Inaicales accessibility of tuning sug). 34 ‘A Howord W. Some [SISSIES Photo TOep! HOW VaTOS CH, SELECTOR & LED BOARD 31BLOCK DIAGRAM BLOCK DIAGRAM 32 33 ose! GOW VaEODMAIN SCHEMATIC 7 35 |"MAIN SCHEMATIC 35 |REVERSE DioDé PLL & CH. SELECTOR SCHEMATIC | POWmE whe arvenst - DIODE TIT ) ' a + 0 te e} ef TTT “ong PLL & CH. SELECTOR SCHEMATIC | POWER SUPPLY SCHEMATIC COBRA MODEL 148GTL 39 40PARTS LIST AND DESCRIPTION en cava pss dale Model Par! Nuwar and Desciphon) WIRING DATA Siaed aes ay eae SREP Ro eget e og sate ae LGR BE Be Sine ae Be TS Tot poate tag He Ma feotne ries SE Bo fear abe att vewenon fiat [Few [MRIS = et sos.son [atesre [Prete | Sem ree oer smmson ie a ee ermee tin eat pacers sesh tele lcoer | Pe = fee 8 ermoace m7 hain | seem ae =. lee dors bon ae vwamson ER Ee si wo EE onan (i a = eee a 2 fee | secs Pe Rae feces! fe ie | momen ie hae lest Hie | smn fet |e a ese Ee poe ret [Sa |e i ee |S fone px [eee [Be Shee Ee EE [mone me leee [au iy [ee Rae [tea2 PARTS LIST AND DESCRIPTION (CONTINUED) ee ocsng ps gate Mode Pa Nunber ond acipte? SEMICONDUCTORS (Select replacement transistor for bes results) (cont) ee po Tan men [ia tan [ves pe fae peer Ne eee |B me [Eee fone ("I Ie = |" ies |e “ eee eh ee Seta? tae [Tels «| ee eh me Ea a ee |e ve [HE pearsce pa et |e tm Bae [enn at Slee Sas ee |e = Brera vers 12th a lusos poser Se By et Hee, (ae (Fe |g wee lee (ae (ere lee |e fom less = [Ee [esse came |S as fe fae we IBF |e fre wee |e meer: foe hee |B [ica ies |e ao Ee ee wo |B |i ee |e ay IBS les" a e ce |p| a By = ay a ay = wo | Jenson ay a ay a ia ziPARTS LIST AND DESCRIPTION (CONTINUED) (hon dca pat te Model Port Nenber and Desripton} SEMICONDUCTORS (Select replacement transistor for best sults) (cont) ae a sa ie bee Himeae [re ete Hes es fee [isl |e [ae 5 host |g [eis 8 cet | eprom) arn te | Sra 2 a ig ar |e ay bes sm | Biba | nose EGE [SRE [ate EaPARTS LIST AND DESCRIPTION (CONTINUED) hon nara ot te Had, Po Norbr o SEMICONDUCTORS ‘Geloct replacement tronssor for best result) (cont) ao ER | ea TarPARTS LIST AND DESCRIPTION (CONTINUED) (hen dering pat, ot Mods Port Numb ond ese SEMICONDUCTORS (Select eee |Reee [rar [t-Beet Wai me W650 ‘Weep! HaOW VEEOD jee fotos eae Frey | Mersey Fite | iaae “ ae tea Bee iia | ma eee mate | roe tae ne rors. eens tat | neers swan | Bitz | vy-cen sce Kesar feast | Mesuee fern [ett mse | Reve | roe oa Sissons [REN 139 jap [Bas (ee aH 45PARTS LIST AND DESCRIPTION (CONTINUED) (hon drag prs a rand asin) SEMICONDUCTORS (sel ‘ont transistor for bost results) (con!) Fay rae foe |e. rae. |e hase tie Flor eases [Ren ba i htc a Hage [tones [Et Bice eieae sess | Besane | res, etate [eenwerss [eat a ie Be Jeeta |bnetze [Seacoe | 2s ee lees fae = 7 eS Rae (HE [, |ee EE. rE ELECTROLYTIC CAPACITORS Soe = ae 2 eo — ana Fa Rj omme [atthe | RISE | POSS. [cine Toners in ws, ee] ammo] at, Fagan SRR atc] SGOT Pa curt | get | ost | ain enamine a fertam* is ce | ae a Be, fe [FS [ge a Lae i 35PARTS LIST AND DESCRIPTION (CONTINUED) [wih erbring pr soe Mal, Part Numba, und Csepton) ‘CAPACITORS (cont! aaa aT Tee | ewe | IMR, Femumacaw | SORE | maucony [__SPAGUE PART Ne raat No | pagtine, | AT No [ume [ GENERAL UNE a ea Be Bee enn z = Hu 2 ez | em 7 BH | sae a 8 eae ar wor IEE 5 eB re | Ee : eS eee | | Be see 3 ba festa 3-aos rss ret Ey ae Be a ie ae a fe re #8 * wes, | sae | eet Q ier asaeiocshn Breas e EE, a hese me [et Be jozs- 121-9408 ” eveesey miseeersens | gere-171 " eas, |" | meee | dios |g | se 220-180-8091 " _ ozs-t2-a-axe mT ast Risritone | ore | so on iz o20-208-8-003 2 oePARTS LIST AND DESCRIPTION (CONTINUED) [When ideing poy ste Model, Pat Membr, ond Deven) CAPACITORS (cont) - ST Ba me {| Ma | GLK, enatmaas | SORBET aucy [SGU FART Re er PART No. Ls GUNE | GENERAL UNE rer fe wes ee |e, | St gens mage | a 3] cee |G | Be fee Sr ieea tmeieson a ee Mron7 wou. a oss-son SiS) | Bom | oman | HES ee, | 8 tu einen ston oon | ine ze Ba = a fear sewean = we, | ER ata Sey | ERR oo ze = e. rmanPARTS LIST AND DESCRIPTION (CONTINUED) [ithon tring pat, ote Model Pat Num ond Deverition) CAPACITORS (cont) RACH ONT we | wwme | tet, [eee | SRRE | muon [Sn a ‘| ranrine’ | parr, | PARTNO. [une [ omarat une aro leperece on | os a 8 ear cy REED cage ella a crn ows mt. CONTROLS (All wotteges 1/2 watt, or less, unless listed) TRACT BATE ten | punerion. east cRNA | AIOE Hes gee fe leans 8 ies vest ha z Win aera : 3 COILS (RF-IF) . a re | punction ae renarns eet ser | ie EE | SigeSeeona | Sea | IEE seein 4 toe ies) Hy 4 is (op i eas Pe Pees 1 an os50 PARTS LIST AND DESCRIPTION (CONTINUED) (tien orerng pr tte Mosel, Part Mer and esoison) FILTER CHOKE eft eas [ame] Ae [MAO] He, ee SPEAKER FUSE DEVICES Ta Ba ce a, mare [Sainte eee weft er [oe soe ;OPHONE TNT SRSA Se TOE one Se Cee PETE ‘MISCELLANEOUS ee a IT Re ot wean auth a CABINETS & CABINET PARTS (When ordering specily model, chassis & color)