[Boatanchors] SP-600 alignment problem

[Bob Young]

Very quickly: I'm following the instructions in the manual to the letter as far as I can tell, using a URM-25F (.01 uf cap) with frequency counter and an HP 410B for AC voltmeter at approx 20 VAC, first align everything at 455 Kc injecting into pin 2 of V5, finding the peak of the crystal at 0.2 selectivity, (2 peaks, one at 454.70 and one at 455.30) 455.30 is higher in amplitude so I used that one (have tried both). Then put on 3 Kc selectivity, peak all the transformers, peak L-37 on 1.3 kc check BFO, all seems ok. I unhook everything put antenna on and the 0.2 selectivity position is exactly on the line, turn to 3 Kc position and I need to tune up approx 300-400 cpc. (BFO is somewhere in the middle) I've done this repeatedly and come up with the same problem everytime although the amount off will vary a little bit. I've tried lowering the output of the generator thinking I was overloading it and that doesn't seem to work either, how many uV should I be injecting into it? doesn't say in the manual. Any ideas? I have noticed that when I tried a socket extender the whole radio also moved up about 500 cpc on the dial, so just using a wire wrapped around pin 2 of V5.

Bob Young
KB1OKL

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