[Boatanchors] SP-600 alignment problem

[Bob Young]

Bob It's a JX-26, my manual says to set it to 455 peak all the IF's at
3khz selectivity position with AVC off, then turn to 0.2 khz
selectivity position and find the resonant frequency of the crystal by
running the generator up and down near 455 till you find a peak, once you find the peak keep
it there (mine's 455.3) then put it back to 3.0 position and again peak
the IF's, this is what gave me the trouble I had two peaks I just tried
peaking the IF's at the 0.2 position and it came out pretty good but
need to fool with it a little more, thanks,



Bob

> Date: Thu, 7 May 2009 14:56:59 -0400
> From: rbethman at comcast.net
> To: youngbob53 at msn.com
> CC: hammarlund at mailman.qth.net; boatanchors at mailman.qth.net; anchor at ec.rr.com
> Subject: Re: [Boatanchors] SP-600 alignment problem
> 
> Bob,
> 
> WHICH SP-600?
> 
> With all the different variants, there are different things to be done.
> My manual says to set to MAN not AVC when doing the alignment.  Also 
> says to set signal Gen to 455Kc.
> 
> A lot of variables!
> 
> "Al Parker" <anchor at ec.rr.com>  is the "keeper" of the "keys"!
> 
> Bob - N0DGN
> 
> Bob Young wrote:
> > 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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> -- 
> Bob - NØDGN
> 
> 

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