HF Multicoupler Build

Picked this up several years ago on eBay and finally got around to working on it recently. It's a straight R-1051, no suffix letter, with the 100 Hz only selectable between 000, 500, and Vernier. I first learned about this receiver while in the Navy in ETA Comm school Great Lakes back in 1977 and worked on them while in the Navy aboard the USS San Jose AFS-7 (1981-1984). This one was a little rough, looked as though it had been dropped and there is a dent in the rear where the Antenna connector is but it still seems to function. Problem is it had really crappy sensitivity and an incredible amount of noise on every frequency. Injecting a signal made no difference. It didn't matter how much signal I applied the noise level stayed there, it didn't quite as signal level was increased. This is where I speculated the noise was probably coming from the synthesizer, which in the end proved to be a correct assumption.


Despite my suspicion the problem was the synthesizer I started with the RF Amp just because I wanted to get into it anyway. Disassemble was easy and very straight forward, just follow the directions in the Repair of AN/WRC-1 and R-1051/URR 2N Modules publication NAVSHIPS 0967-034-2000. Above pictures show the assembly with the RF Strips removed. The ckt board showing in the 4th picture is not used in the receiver, this board is only used in the T-827 Exciter. The strips were very easy to remove. I checked continuities of the coils and the values and leakage for all the capacitors, all checked good on all strips. Next I cleaned up the contacts on the strips and then set them aside for reassembly and continued disassembly of the RF Deck.


Above shows Inner Assy and Turret removed. Couple different shots of the removed assy above. Came out just as the 2N manual described. it was really very clean and in good shape on the inside. Next, removal of the 10 and 100KHz turret assy.


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