Racal RA-117 Receiver Section: Notes, Layout, Tube List Page: 1 Dwg. Rev.: 2013 Jan 17

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1 Notes Early version retains the 0.- setting on RANGE, along with the accompanying L & C, from the RA-. Later version replaces this with the WIDEBAND Ω setting. Early version takes the socket (SK) off SK00 with a T connector. Later version adds SK00B to feed SK. Some units remove action from the Amp through the following alterations: - (ES) is replaced with a DJ (sharp cutoff) - is shorted Also in the, R may be shorted. Some units have V replaced with a AU. C is mislabeled as C on chassis. Labeling of SK0 and 0 is mixed up between chassis and schematic. Capacitance in microfarads unless otherwise indicated. This is a re-drawing of a scanned version of the manufacturer schematic EC00, obtained from: Some part numbers and values were blurred in the scan, for surety they should be checked against the parts list in the manual, if in question. Drawn 00 Jun by bhilpert. Tube Functions & Types Tube Function Type V(P) V(S) V(K) Type Count Alternate Shield Crystal Osc. 0. S Harmonic Generator 0 S Amp ES - 0 AQ 00 T b Amp " 0 -. AS S Harmonic Mixer AS 0 M V - BE 0 M V Amp 0. ES ECC M V st Mixer 0 0. DJ ECC/ECC M V Amp 0. ECC DJ M V Mixer 0. ECC/ DJ M 0 Amp 0.0 ECC/0 DJ M Buffer. 0 M Osc b Amp " - E0F S Calibrator (A) BE 0 st Amp 0 0. Calibrator (B) 0. Amp 0. Output. & TC Detector & Noise Lim Audio Output AQ 00. S h i e l d Count Audio Line Output 0 -. Short b Audio Preamp " -. Med Clamp Tall Mixer 0. Short th Mixer BE 0. Med Crystal Osc L KC/S C C C CB C TP 0 V L0 L L0 L & th BE SK00A L0 SK 0 L00 L0 SK00B SK0 SK 0 C0 SK00 SK XL00 SK0 C SK0 SK 0 Physical Layout Top View Bottom View POWER S 0 MC/S MC/S - MC/S BAND- PASS AS TP L C V SK V L L L0 SWITCH & AMPLIER GENERATION SK XL L V V TP BE L C C C C C L POWER S L0 T L L L L T AQ ES 0MC/S & ATTENUATOR POWER SUPPLY & Section: Notes, Layout, Tube List Page: Dwg. Rev.: 0 Jan

2 Frequency Mixing Equations = ( SIG) ( nx) = nx SIG = =. SIG = sial frequency nx = an integral multiple of the MC/S Crystal Osc. = frequency = frequency = frequency (output of Mixer) = frequency (output of Mixer) = th frequency (output of th Mixer) Tuning Examples All values in MHz except KHz Dial Equation a b c a b MHz Dial MD.. 0 KHz Dial KD Sial Tuned SIG = 0. + MD st = - SIG Harmonic Amp HA = - (T(MD)+) = - HA..0. =. - KD = th = AERIAL SK 0 MC/S SK ATTEN- UATOR TUNG RANGE TUNE OSC. AMP MEGACYCLES GENERATOR SK 0 MC/S MC/S V MHz st, 0 MC/S ±0. MC/S ±0. MC/S KILOCYCLES MC/S EXT. SK0 - MC/S SK T. / EXT. Buffer. MC/S ± KC/S SK0 SK0 OSC. th V V V,V SK0 KC/S S BANDWIDTH LC / LEVEL st SHORT / LONG, NOTE DETECTOR KC/S SK SK a LEVEL S METER AF LEVEL b NOISE MONITOR GA LEVEL METER b a SPEAKER Ω W mw Section: Block Diagram Page: Dwg. Rev.: 0 Jan

3 AERIAL SK C 0 MC/S ATTENUATOR L L L SA TUNE CA pf C0 C S. RANGE MC/S S. CC.pF C C C M MAX C pf R R R R.F. TUNG C L C L C L C L L R R.F. ATTENUATOR R R R R R S. SB RA CB pf M MAX RB S. R C RB RA K R K CA C R 0K C C R C C.pF C R C R.F. L R C.pF L C 0. L C.pF ES DJ (see Notes) C.pF C0 0 MC/S L L L L C.pF C MEGACYCLES C pf C.pF C.pF C C.pF h R0 K C V bl R0 R C pf R L R C C L L0 C R K C R K C R K TP R V st C pf 0 MC/S resonant circuits in-between. C,,,,0,: pf (trimmer) C,,,,,0: pf (fixed) C L,,,,, pf L og R, C R K C SK CC CA 0pF CB pf OSC. / R R R.K C XL h C pf C 0.00 C pf RA C K pf CA pf R K R 0 Section: Input,, Harmonics Generation Page: Dwg. Rev.: 0 Jan L CA h GENERATION GENERATOR RB L L L h R C K pf CA 0pF CA pf SK C pf TA SUB-CHASSIS MC/S L C0 pf L C pf TO MC/S L C pf C0 L MC/S SK R 0 R R K C R TP h R R C0 pf AS R0 0 L C C R K C0 R C R K h C pf R V R L C C R K C R.K C R V h C pf R C pf resonant circuits in-between. C,,,,,: pf (trimmer) C,,,,,: pf (fixed) L,0,,,,0 L h C R K C

4 C pf C pf g C R0 L 0 MC. MC C pf C0 pf L 0 L0 R0 C 0pF C pf C g C TP R K C R K R V R00A 0 R00 0 C00.pF C0 g R MC/S L0 TRAP, C g C0A C0 L00 TRAP R K C C SK/PL00 RED SK SK/PL00B BLK-WHI C pf - MC/S L0 L0 L0 L C pf L0 C pf C 00pF C pf L0 / th SUB-CHASSIS C pf C pf R.K L GRN PL/SK0 C0 C pf L0 C0A 0pF CA R0 K R L0 C0 pf R R R. MC/S, C C pf pf L0 C R K C 0.00 C L L R K C pf C R RA BE RA th R C 0. R R K C ORG SK/PL SUB-CHASSIS C pf KILOCYCLES C pf PL from MC/S OSC. C0 pf R0 K R C R M R K C R0 C0 pf R K C v C pf R.K R C R0 K a R C0 pf L0 Ω L KHz R 0 L.Ω C pf BE R K C 0. PLUG- R K v R 0 R C pf R M b - EXT. SK0 BRN C pf C 00 KHz R K SK L.Ω C pf EXT T C 0. S00B R C R K C SK0 WHI SK/PL0 WHI WHI PL/SK00A R0.K C0 R0.K R0 R0 K BUFFER R0 C K CA pf C0 SK0 R BLU-GRN K R0 0 C0 I.F. R C C pf KC/S I.F. C SA C 00 C. KC KC. KC KC R.K C 0.0 R XL00 L.MC/S OSC. R 0 BANDWIDTH SB C L L L0 R K C pf C0 C pf SB C 00 C. KC KC. KC KC C 00 C. KC KC. KC KC C 0pF C 0.00 R K R 0K.MC/S SK0 BLU C.pF C.pF XL,Hz XL,0Hz XL,0Hz XL,Hz.MC/S SK C 00 C. KC KC. KC KC SC Section:, Mixers, Filters Page: Dwg. Rev.: 0 Jan R C0 KC/S LC I.F. BANDWIDTH C 00 C SA. KC KC. KC KC C 00 C. KC SA KC. KC KC C 0pF C 0.00 C C CA 0pF 0pF pf L C 00 C L. KC SB KC. KC L KC R K C CA 0pF 0pF C pf C 00 C L. KC SC KC. KC L KC R0 K C CA 0pF 0pF C pf L R RA: R: 0 R: 0 C 00 C L. KC SD KC. KC KC C CA 0pF 0pF C pf C0A pf C C pf SE C 00 C. KC KC. KC KC C 00 C. KC KC. KC KC SE

5 R0,.K C R K R 0K C R 0pF R K R.M R K Terminal Strip - - audio cap - - GND - limiter - audio out - source - gain dest. - dest. - meter Level - gain manual - C - bfo - - filament - out - meter+ S Level - meter S Level st I.F. R 0 C C 0pF 0pF L C 0. R K C wh-og R K L R K R K RA wh-.k Modification to circuitry. Simplifies wiring and eliminates one pole on SYSTEM switch. (bh / 0. Implemented on Unit N0.) b See Notes SHORT -vi L S LONG C0 NOTE C0 C pf 0pF CA.0 F E C00 0pF CH. R C R K R R C R K C0 R.K R C 0pF R K R bfo C0 pf SYSTEM S.L R L R C C 0pF 0pF L R.K I.F. C 0. R K C 0. RA K C0A L C0 0. R K C C R K C C pf L CA CB 0pF 0pF L KHz. SK SK R0A K R0 K / GA R K C C pf C0 0pF R K C0 0. I.F. DETECTOR C 0. a R K C 0pF a R.K R K R.K R K C 0pF L C0 pf R K C 0. R M C 0. C b R.M C0 R K NOISE R.M wh -vi bu-wh bu S OFF C R M R M SYSTEM CH. S.R CH. S.R CB pf AF LEVEL CA pf AF GA SHORT RA K C0 0pF S a b LONG POWER SUPPLY / R CA.0 T RA K R0A.K R0B R.M R K C0A 0. C R.K AMPLIERS RA K See Notes C AQ, CA CB b C 0. R.K R K R0 0 C 0. R 0 T RA K R 0 C 0 CA 0. CB 0 RA K F E RB M RC M AF LEVEL S METER LEVEL HEADPHONES SPEAKER S bk -bk bu-wh wh-bk og-bk RA.K See Notes R K RA K C0A PS/A METER S M RA mw Ω W Section: Amp, Detector, Audio, Page: Dwg. Rev.: 0 Jan

6 C0 C POWER S F A.V R W C V V 00V 0V 0V V V V 0 C CH. F 0mA C R 0 W C 0. C RA W CH. A CH. D CA CA V CA L0 S.L S.R S.L H.T. ADAP. Section: Power Supply Page: Dwg. Rev.: 0 Jan L C R of K C L C h R C R h C R K h C 0. L C 0. C C V C V C C 0. L C C C 0. V V CA V L 0 C C L C g C R K g CA C C CA 0. CA CA T RL CA Dial st st POWER SUPPLY / CH. S.L C 0. S bfo C0 MUTE - -bn -bu -og -gy -bu vi L C0 C0A C & th & th S B C0 L C - T EXT S00A C CA R0A K v C0A C - - -bk -wh -wh GEN C?

7 Paper Capacitors Resistors Resistors C Voltage Qty >=0V R P Qty R P Qty 0.00µF 0V / / 0.00µF 00V / K / µf 0V / K / µf 00V / K / µf 00V / K / 0.0µF 0V / K / µf 0V / K / 0.µF V K / 0.µF 0V / K / 0.µF V / K / 0.µF V 0 / K / µf V / K / 0 / K / Electrolytic Capacitors 0 / K / C Voltage Qty 0 / µf 0V 0 / K / µf 0V / K / 0µF V / 0K / µf 0V / 0K / 0 / K / Mica Capacitors C Voltage Qty K / M /? K /.M /?.K /.M /.K /.M / Ceramic Capacitors / M / C Voltage Qty /?.K / Power Resistors?.K / R P Qty.K / WW.K / 0 WW WW WW is in / mixer subchassis System Switch (viewed from bottom of chassis) to - L R -gy to audio to HT ADAP -bk -bn to XTL CAL STD-BY R fm relay -bu to diode to to Mixer fm HT ADAP to - -wh -og -og L L R R System Switch Unit N0 (viewed from bottom of chassis) -vi fm detector bias fm GA to - to audio L R -bn STD-BY R fm relay -wh -bu to to Mixer fm HT ADAP to - -og -og L R -gy -bk to HT ADAP to XTL CAL to diode to - to audio STD-BY R fm relay fm detector bias fm GA System Switch simplified to eliminate two poles (viewed from bottom of chassis) L L R to Mixer fm HT ADAP to - R to HT ADAP to XTL CAL to bias fm GA -vi L R fm detector Section: Component Tallies Page: Dwg. Rev.: 0 Jan