AN/ ARC-73 or 51X-2B + 17L7. ARC73 Interconnections kb. Instrumentation. Receiver 51X-B2. unit 344B-1. Transmitter 17L-7(A)

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Ambrose Mason
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1 N/ R or XB + L ir bnd trnsceiver, built by ollins Rdio o. N/R Rdio set,.z, 0 chn, 0z step, 0 preset,, 0 W, V t mps, jor components: T, R nd 0. N/R Rdio set,.z TX, 0.z RX, 0z steps,, 0 W, V t mps, jor components: T, R nd 0. The R rdio set consists of: R prt OLLINS nr R (XB) receiver, T (L) trnsmitter, 0 (U) control unit nd T ( 0E) dul shockmount The R will trnsmit/receive t: L Trnsmits on.... z in 0kz steps ( 0 chnnels) L Trnsmits on.... z in 0kz steps ( 0 chnnels) = IL version R XB() Receives z in 0kz steps ( 0 chnnels) The control pnel hs internl moveble endstops for both minimum nd mximum frequency : IN stop t 0 or z, nd X. stop t. of. z. The receiver hs two outputs. One for udio with speech filter of 00z 00z, the second output is for NV signls like VOR or LO with full bndwidth of 0z to kz. The trnsmitter hs crbon microphone input for Vrms with bndwidth of 00 00z. 0 0k VOL 0Ω ontrol Pnel U or 0/ R ON B E F G L N squelch udio B E F G L N Not connected Reserved for GlideSlope Frequency ontrol pnel Receiver XB Trnsmitter L() P P Nv lock Blue pins on P White pins on P V~ 0 mute 0 +V R Interconnections 0 kb Side tone NT Rer view of trnsmitter Rx P udio LO rely isble 0 ntenn Pushtotlk 0 V~ Instrumenttion unit B udio +V +V Rer view of receiver Only version

2 VF ontrol Pnels U,,,,, or 0/R The U pnel hs two independent wire frequency control switches, one for X receiver nd one for the L trnsmitter. Switch pos. 0 0 NV O EXTENE Skip Even Odd z z TRNSIT P X X? X X X X X X X X L pin P B X X X X X X X X X P X X X X X X X X P0 X X X X X X X X X P N X X X X X X X X X X REEIVE X X X X X X X X X X X X X X pin B X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 0 N X X X X X X X X X X X X X X Pin nr on U control pnel Rx Z select 0 B Frct. z select E F G Odd z 0 kz 0 00 kz L 0 Even z Extended N 0kΩ Squelch pot 0 Ω Vol.pot top power switch to Vol.pot wiper gnd Vol pot cold il lmps gnd il lmps gnd Pink re not ccessible Green re 0. Rx only ccessible in U or Frctionl z control lines E,F,G, (sme code for Rx nd ) : Line Rx pin pin XB L E X X X X 0 P F X X X X P G X X X X P X X X X P line to Rx Pin resp. pin P connected to ground for odd z line to Rx Pin resp. pin P connected to ground for.x0 z Lline to Rx Pin resp. pin P connected to ground for.x z line to Rx Pin resp. pin P connected to ground for even z Nline to Rx Pin 0 resp. pin P X connected to ground for extended z pin connects to ground when selected nd freq=,,0,, or z pin connects to pin when powerswitch is ON Positions mrked X bove re connected to ground in the control pnel Postions not mrked X re interconnected in the control pnel nd not to ground. U hs extr outputs for Glideslope receiver chnnel selection when freq=0 or 0.xx mc U hs extr outputs for E trnsceiver chnnel selection when freq= 0.xx mc

3 RF PLIFIER IXER VR IF PLIFIER 0 z V z V V V x 0= 0 chnnels 0 IXER TP TP TP TP nf z 00k n FO.. z in steps of z Ω 0 0 FO Xtl freq k Filter freq..v TP 0k 0k Position tuning shft (degrees) k 0 0 Xtls x x 0 = 0 chnnels k k 00k kz z steps 0. z steps k TP V 0 00 Osc/doubler Filter freq. k LFO Xtl freq k 0 0 Position tuning shft (degrees) Even z odd z LO chnnels +V Ω < z z steps 0 / + z 00kz steps 0 / 0kz LO R? 00k nf 0 k 0 k 00k TP 0 Xtls 0k LFO 0 0uF TP nf k 0.. z in 0 steps of 0 kz 00 G 0.u L FIXE IF 0.u N UIO 0k PWR SUPPLY filments 00uF +0V uf ute * T = 0. z T* 0 T* enble 0uF V~ 00z +V + 0 Ω x uf 0 Ω +V.V~. mute tuning 0 Ω squelch XB VF REEIVER ( R) 00 kb V~ 0 Ω F V V V V V V Testpoint odule connector pole RF subfrme connector X connector on front in connector X Not connected ground FIXE IF VR IF F V RF E V V 00k k UTE k From lst IF stge 00 kz nf 00Ω 00kz filter pf 00k +V TP k 0p uf m 0p 00k 0k 0n V 0n 0k 0k 0n u n 00 kz 0k V 0 V 0k 0n 0 k 00k k 00 kz TP TP TP k k k 0 uf TP n 00k TP 0.u N0 (V ) URL LEVEL 0p 0k nf 0z/ 0z/0z / 0z VOR LO LO VOR Speech Filter 000z k TP +V Vpp c 0.u 0.u k k +V 0 0 V 0n T/VOR/LO k 0u 0u : 0 k N ux 0 SQUEL disble k k SQUEL Phone Z=00Ω

XB VF REEIVER IL nme R / R The receiver covers 0. z in 0 kz steps, 0 chnnels Input Sensitivity uv ntenn impednce Ω. Output 00mW into 00 Ω (Vrms) The receiver is double superhet, with one RF stge.

. z in 0kz steps ( 0 Xtls) In totl x 0 x = 0 chnnels second IF 00kz fixed The Xtls of the second LO re used twice: once 00kz below the first IF signl, nd in second turn of the selector t 00kz bove

On log scle, the pssbnd ripple is db, the signl is 0dB down outside 0 0 kz. Fig. Trnsfer function of the 00kz mechnicl filter on linlin scle. The G voltge on TP with squelch djusted t uv is.

4 XB VF REEIVER IL nme R / R The receiver covers 0. z in 0 kz steps, 0 chnnels Input Sensitivity uv ntenn impednce Ω. Output 00mW into 00 Ω (Vrms) The receiver is double superhet, with one RF stge. The RF stge is tuned with fourfold vrible cpcitor st LO.. z in z steps ( Xtls), first IF 0 z, vrible, permebility tuned nd LO 0.. z in 0kz steps ( 0 Xtls) In totl x 0 x = 0 chnnels second IF 00kz fixed The Xtls of the second LO re used twice: once 00kz below the first IF signl, nd in second turn of the selector t 00kz bove the first IF signl. The result is 00kz signl tht is filtered in ollins mechnicl filter. The trnsfer function on liner scle is shown below. On log scle, the pssbnd ripple is db, the signl is 0dB down outside 0 0 kz. Fig. Trnsfer function of the 00kz mechnicl filter on linlin scle. The G voltge on TP with squelch djusted t uv is..v t 0dBm input nd V t 0dBm input. T output. The receiver hs widebnd output for the VOR signls (0z nd kz) or LO signls ( 0 nd 0z). This output is not squelched nor clipped. Three contcts re vilble tht close to ground on the T chnnels (0. z), one cn be used to slow down the G response, nother to select horizontl (VOR/LO) or verticl (comm.) ntenn Squelch nd udio The squelch tube is controlled by the G voltge. The udio stge hs shrp speech filter with z pssbnd ( see below). The filter peks re t 0, 00 nd 000 z. The pek t 0z ws due to mins hum in my test setup. Spechfilter response on loglog scle Front connector X pin novl connector is used in conjunction with n externl VOR/LO decoder like the ollins B Instrumenttion Unit. Rer connector X pin P connector with one cox input for the ntenn signl. onnects to the remote control pnel nd power source. Power supplies, filments The X ws vilble with either input ( V/00z) or only input. The only difference is the power supply module ll filments re in prllel in the version, but in the version they re connected series/prllel. ohm dropper resistor is mounted in the min chssis to reduce the.v to x. =.V. The supply hs despiker to block spikes up to 0V on the input, nd W inverter to provide 0V/m. The ripple in the pssbnd is possibly too high due to the 0 ohm genertor impednce, insted of k s specified by ollins. Lod ws 00k s specified. G utomtic gin control is fst for the communiction signls, but must be slow for nvigtion s the modultion frequency is low, 0z for the VOR, 0z or 0z for LO. This is done utomticlly when pins nd on the novl socket X on the front re interconnected. +V Ω k k 0u N k x N0 0 0 k n k espiker N.V 0 You cn mil me t.k.bouwknegt t home.nl PWR SUPPLY Type B uF 0u

The FO crystls re in z steps, the 0 LFO crystls hve 0 kz steps. The LFO nd FO signls re mixed, nd multistge tuned filter selects the crrier signl from the result.

5 R (ollins L) Trnsmitter tuning echnicl Tuning Unit The mechnicl tuning system is the bckbone of the RF module of the L. It consists of Vdc motor, two electromechnicl es nd to trnsfer motion to the crystl selector shfts of the high frequency oscilltor (FO) nd the low Frequency oscilltor (LFO). The FO crystls re in z steps, the 0 LFO crystls hve 0 kz steps. The LFO nd FO signls re mixed, nd multistge tuned filter selects the crrier signl from the result. The vrible cpcitor (vrco) shft of this filter is driven from mix of the FO nd LFO shfts z Lo Bnd Filter freq. i Bnd FO Xtl freq Position tuning dil (degrees) one full turn of the vrco. icroswitch S is on the vrco shft nd forces the motor to skip the unused hlf turn. icroswitch S is on shft with twice the speed, nd used to select LoBnd or ibnd. In ibnd, the lst two positions ( nd z) re skipped. In Lo Bnd, the LFO frequency is decresing with incresing trnsmit frequency, while in i Bnd, the LFO frequency is incresing with incresing trnsmit frequency. Rely ner the LFO crystls reverses the sequence in the Lobnd cse. The crystls of the FO re used twice: once bove the frequency (Lo bnd), nd once below the frequency (i Bnd). Over the whole Lo + i bnd, the vrco of the tuned filters mkes only hlf turn. So, the FO crystl selector mkes turns for 00Ω The rely connects TU pins vi the rer plug to the control pnel, depending on the SS / S mode. When P is left open, norml mode is selected ( sme frequency for receive nd trnsmit). When P is connected to ground (ul chnnel mode) then the trnsmit frequency is z bove the receive frequency for the first columns in the tble below, or z lower in cse of the lst columns. The control pnel llows 0 (Rx) only for, so ll trnsmit z bove the receive frequency. The coding of the z switch S is s follows. X mens no connection (tht output is open.) Exmple: in norml mode, with line connected to ground in the control pnel, the motor stops when both TU pins nd re open, i.e. t,, nd etc z. m c S Lo i & skip dil S input: 0 /// X X X X X X 0/// X X X X X X //0/ X X X X X /// X X X X X /// X X X X X /// X X X X 0/// X X X X X //0/ X X X X X X /// X X X X X X 0 0 Ω S SB ( x ) x 0 = 0 chnnels z steps 0. z steps S 0 0 TU Pins used in norml mode X X X X & B X X X X X X X 0 X X X X & 0 Rer connector Pin of P Pin on P Rer side connector +V relys 0 > z 0 / + z z steps 00kz steps 0 / 0kz S Ω S Norml ul hnn & & 0 & 0 & Tble rely llowed m c TU Pins used in ul chnn mode X X X X & B X X X X X X X & Pin on P Rer side connector X X X X 0 Exmple: ontrol set t z dul chnnel > receive, Trnsmit t 0 z

6 N /R Trnsmitter ( ollins L) Power supply nd chssis wiring V~ +V 0 +V NV ute Rx V 0. Full scle ( 0 ) Q,Q SP 00 m. PP 00 V. V 00 V. LV 0 V. BT.. OE m. RG 0 m. PG 0W. NT 0. OFF Push to Tlk fn Power Supply odule k uf 0u/ 0u uf 0W kz 0 0 V~ k Q +V ll relys 00Ω R ( T/R switch) 0 R R0 0 b Q + T x N 0 m / mv +V k 00k k 00k k 0.uF 0 uf 00V= 0 0V 0k uf 00V= +0V 0m k 0 uf +V 0 m b P RF module FO nd utotuner filments FO /relys odultor 0m L 0uF 0 Sidetone detector nd RF filter isble +V 0uF I BN N Odd/even z.x00 kz.x0 kz rbon mike bis 0. E F G B L sidetone mike 0 0 P P NT Rer view of trnsmitter chssis Rx,, pole sub connectors pole sub connector P,P P connectors Gry: not connected ollins L VF Trnsmitter hssis wiring nd power supply y 0 / kb N/R

7 0uF 0 0uF 0m /0. + V m= Q. T k 0uF k 0 k P rbon ike 00 Ω R k k 0u k Q. N u 0 k k 0u k Q. T 0uF L OULTOR sept 0 kb 0m= 0 T 0 k Q / Q SP x R uf OE meter k (+) : T T +V m= g Sidetone Output into 00Ω P +0V k R uf m= plte k.u 0k k n n p eter NT Sidetone detector p p p + V n p p FO V 0 k V k k V. z V V n P.. z in steps of 0.z 0 0 Xtls P.. z LFO 0 Xtls P +V.. z in 0 steps of 0kz Reverse sequence 00k V 0 n k P 0u k k k k k 0 k V 0 0 k P V k k 0k k 00 V V 00 n R. R +V.Ω V V.V /0. PG 0V 0. V.Ω,,0 n.c..v +V RG. z Filter freq.. Lo Bnd i Bnd. FO Xtl freq Position tuning shft (degrees) z Lo Bnd i Bnd.. LFO Xtl freq.00.. Position tuning shft (z) Testpoint Pin on pin connector P (LFO nd mplifier) Pin on pin connector P (FO nd tuning) ollins L RF odule / /0 kb R

AN/ ARC-73 or 51X-2B + 17L7. ARC73 Interconnections kb. Instrumentation unit 344B-1. Receiver 51X-B2. Transmitter 17L-7(A)

AN/ ARC-73 or 51X-2B + 17L7. ARC73 Interconnections kb. Instrumentation unit 344B-1. Receiver 51X-B2. Transmitter 17L-7(A) N/ R or XB + L ir bnd trnseiver, built by ollins Rdio o. N/R Rdio set,.z, 0 hn, 0z step, 0 preset,, 0 W, V t mps, jor omponents: T, R nd 0. N/R Rdio set,.z TX, 0.z RX, 0z steps,, 0 W, V t mps, jor omponents: