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

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Gavin Stafford
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1 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: T, R nd 0. The R rdio set onsists of: R prt OLLINS nr R (XB) reeiver, T (L) trnsmitter, 0 (U) ontrol unit nd T ( 0E) dul shokmount The R will trnsmit/reeive t: L Trnsmits on.... z in 0kz steps ( 0 hnnels) L Trnsmits on.... z in 0kz steps ( 0 hnnels) = IL version R XB() Reeives z in 0kz steps ( 0 hnnels) The ontrol pnel hs internl moveble endstops for both minimum nd mximum frequeny : IN stop t 0 or z, nd X. stop t. of. z. The reeiver hs two outputs. One for udio with speeh filter of 00z 00z, the seond output is for NV signls like VOR or LO with full bndwidth of 0z to kz. The trnsmitter hs rbon mirophone 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 squelh udio B E F G L N Not onneted Reserved for GlideSlope Frequeny ontrol pnel Reeiver XB Trnsmitter L() P P V~ 0 Nv lok mute Blue pins on P White pins on P 0 P +V NT Rer view of trnsmitter Rx udio Side tone LO rely isble 0 udio out ntenn Pushtotlk Instrumenttion unit B ike in +V +V 0 V~ Rer view of reeiver R Interonnetions 0 kb

2 VF ontrol Pnels U,,,,, or 0/R The U pnel hs two independent wire frequeny ontrol swithes, one for X reeiver nd one for the L trnsmitter. Swith 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 0 N X X X X X X X X X X X X X X 0 0 Pin nr on U ontrol pnel Rx Z selet 0 B Frt. z selet E F G Odd z 0 kz 0 00 kz L 0 Even z Extended N 0kΩ Squelh pot 0 Ω Vol.pot top power swith to Vol.pot wiper gnd Vol pot old il lmps gnd il lmps gnd Pink re not essible Green re 0. Rx only essible in U or Frtionl z ontrol lines E,F,G, (sme ode 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 onneted to ground for odd z line to Rx Pin resp. pin P onneted to ground for.x0 z Lline to Rx Pin resp. pin P onneted to ground for.x z line to Rx Pin resp. pin P onneted to ground for even z Nline to Rx Pin 0 resp. pin P X onneted to ground for extended z pin onnets to ground when seleted nd freq=,,0,, or z pin onnets to pin when powerswith is ON Positions mrked X bove re onneted to ground in the ontrol pnel Postions not mrked X re interonneted in the ontrol pnel nd not to ground. U hs extr outputs for Glideslope reeiver hnnel seletion when freq=0 or 0.xx m U hs extr outputs for E trnseiver hnnel seletion when freq= 0.xx m

3 RF PLIFIER IXER VR IF PLIFIER 0 z V z V V V x 0= 0 hnnels 0 IXER TP TP TP TP nf z 00k n FO.. z in steps of z Ω 0 0 k Filter freq..v TP 0k 0k 00 k 0 0 Xtls V 0 00 Os/doubler kz Filter freq. FO Xtl freq 0 LFO Xtl freq Position tuning shft (degrees) Position tuning shft (degrees) Even z odd z x x 0 = 0 hnnels z steps 0. z steps +V luth luth k k 00k k TP LO hnnels < z z steps 0 / + z 00kz steps 0 / 0kz LO enble Ω R? T* 0 k T* k 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 0uF V~ 00z +V + 0 Ω x uf 0 Ω +V.V~. mute tuning 0 Ω squelh XB VF REEIVER ( R) 00 kb V~ 0 Ω F V V V V V V Testpoint odule onnetor pole RF subfrme onnetor X onnetor on front in onnetor X Not onneted 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 0p 0p 00k 0k 0n k uf k m 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 0 uf TP n 00k TP 0.u N0 (V ) URL LEVEL 0p 0k nf 0z/ 0z/0z / 0z VOR LO LO VOR Speeh Filter 000z k TP +V Vpp 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 reeiver overs 0. z in 0 kz steps, 0 hnnels Input Sensitivity uv ntenn impedne Ω. Output 00mW into 00 Ω (Vrms) The reeiver is double superhet, with one RF stge.

. z in 0kz steps ( 0 Xtls) In totl x 0 x = 0 hnnels seond IF 00kz fixed The Xtls of the seond LO re used twie: one 00kz below the first IF signl, nd in seond turn of the seletor t 00kz bove the first

Fig. Trnsfer funtion of the 00kz mehnil filter on linlin sle. The G voltge on TP with squelh djusted t uv is..v t 0dBm input nd V t 0dBm input. T output.

4 XB VF REEIVER IL nme R / R The reeiver overs 0. z in 0 kz steps, 0 hnnels Input Sensitivity uv ntenn impedne Ω. Output 00mW into 00 Ω (Vrms) The reeiver is double superhet, with one RF stge. The RF stge is tuned with fourfold vrible pitor 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 hnnels seond IF 00kz fixed The Xtls of the seond LO re used twie: one 00kz below the first IF signl, nd in seond turn of the seletor t 00kz bove the first IF signl. The result is 00kz signl tht is filtered in ollins mehnil filter. The trnsfer funtion on liner sle is shown below. On log sle, the pssbnd ripple is db, the signl is 0dB down outside 0 0 kz. Fig. Trnsfer funtion of the 00kz mehnil filter on linlin sle. The G voltge on TP with squelh djusted t uv is..v t 0dBm input nd V t 0dBm input. T output. The reeiver hs widebnd output for the VOR signls (0z nd kz) or LO signls ( 0 nd 0z). This output is not squelhed nor lipped. Three ontts re vilble tht lose to ground on the T hnnels (0. z), one n be used to slow down the G response, nother to selet horizontl (VOR/LO) or vertil (omm.) ntenn Squelh nd udio The squelh tube is ontrolled by the G voltge. The udio stge hs shrp speeh 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. Spehfilter response on loglog sle Front onnetor X pin novl onnetor is used in onjuntion with n externl VOR/LO deoder like the ollins B Instrumenttion Unit. Rer onnetor X pin P onnetor with one ox input for the ntenn signl. onnets to the remote ontrol pnel nd power soure. Power supplies, filments The X ws vilble with either input ( V/00z) or only input. The only differene is the power supply module ll filments re in prllel in the version, but in the version they re onneted series/prllel. ohm dropper resistor is mounted in the min hssis to redue the.v to x. =.V. The supply hs despiker to blok 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 impedne, insted of k s speified by ollins. Lod ws 00k s speified. G utomti gin ontrol is fst for the ommunition signls, but must be slow for nvigtion s the modultion frequeny is low, 0z for the VOR, 0z or 0z for LO. This is done utomtilly when pins nd on the novl soket X on the front re interonneted. +V Ω k k 0u N k x N0 0 k 0 n k espiker N.V You n mil me t.k.bouwknegt t home.nl PWR SUPPLY Type B uF 0u

The FO rystls re in z steps, the 0 LFO rystls hve 0 kz steps. The LFO nd FO signls re mixed, nd multistge tuned filter selets the rrier signl from the result.

5 R (ollins L) Trnsmitter tuning ehnil Tuning Unit The mehnil tuning system is the bkbone of the RF module of the L. It onsists of Vd motor, two eletromehnil luthes nd to trnsfer motion to the rystl seletor shfts of the high frequeny osilltor (FO) nd the low Frequeny osilltor (LFO). The FO rystls re in z steps, the 0 LFO rystls hve 0 kz steps. The LFO nd FO signls re mixed, nd multistge tuned filter selets the rrier signl from the result. The vrible pitor (vro) 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 vro. iroswith S is on the vro shft nd fores the motor to skip the unused hlf turn. iroswith S is on shft with twie the speed, nd used to selet LoBnd or ibnd. In ibnd, the lst two positions ( nd z) re skipped. In Lo Bnd, the LFO frequeny is deresing with inresing trnsmit frequeny, while in i Bnd, the LFO frequeny is inresing with inresing trnsmit frequeny. Rely ner the LFO rystls reverses the sequene in the Lobnd se. The rystls of the FO re used twie: one bove the frequeny (Lo bnd), nd one below the frequeny (i Bnd). Over the whole Lo + i bnd, the vro of the tuned filters mkes only hlf turn. So, the FO rystl seletor mkes turns for 00Ω The rely onnets TU pins vi the rer plug to the ontrol pnel, depending on the SS / S mode. When P is left open, norml mode is seleted ( sme frequeny for reeive nd trnsmit). When P is onneted to ground (ul hnnel mode) then the trnsmit frequeny is z bove the reeive frequeny for the first olumns in the tble below, or z lower in se of the lst olumns. The ontrol pnel llows 0 (Rx) only for, so ll trnsmit z bove the reeive frequeny. The oding of the z swith S is s follows. X mens no onnetion (tht output is open.) Exmple: in norml mode, with line onneted to ground in the ontrol pnel, the motor stops when both TU pins nd re open, i.e. t,, nd et z. m 0 > z 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 hnnels z steps 0. z steps luth S 0 0 luth 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 onnetor Pin of P Pin on P Rer side onnetor +V relys S Ω 0 0 / + z z steps 00kz steps 0 / 0kz S Norml ul hnn & & 0 & 0 & Tble rely llowed m TU Pins used in ul hnn mode X X X X & B X X X X X X X & Pin on P Rer side onnetor X X X X 0 Exmple: ontrol set t z dul hnnel > reeive, Trnsmit t 0 z

6 N /R Trnsmitter ( ollins L) Power supply nd hssis wiring V~ +V 0 +V NV ute Rx V 0. fn Full sle ( 0 ) Q,Q SP k x N uf 0 T 00V= uf 0u/ 0u uf 0W kz 0 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 Power Supply odule 0 V~ k Q +V ll relys 00Ω R ( T/R swith) 0 R R0 0 b Q + m / mv +V k 00k 00k k k 0 uf 00V= 0 0V 0k +0V 0m k 0 b uf +V 0 m P RF module FO nd utotuner filments FO odultor 0m L 0uF 0 Sidetone detetor 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 hssis Rx,, pole sub onnetors pole sub onnetor P,P P onnetors Gry: not onneted 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 0 Trnsmit 0 k k 0 0u R k Q. N u 0 k k 0u k Q. T 0uF 0m= 0 L OULTOR sept 0 kb T 0 + V k Q / Q SP x R uf OE meter (+) : T T m= g Sidetone Output into 00Ω P +0V +V k R uf m= plte k.u 0k k n n n p eter NT Sidetone detetor p p p 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 sequene 00k V 0 n k P 0u k k k k k +V 0 k V 0 0 k P k k V k 0k 00 RG V V 00 V R n. R +V V.V /0. PG 0V V.Ω,,0 n...ω 0..V. z Filter freq. z Lo Bnd i Bnd. Lo Bnd. i Bnd. FO Xtl freq. LFO Xtl freq Position tuning shft (degrees) Position tuning shft (z) Testpoint Pin on pin onnetor P (LFO nd mplifier) Pin on pin onnetor P (FO nd tuning) ollins L RF odule / /0 kb R

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

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