[Hammarlund] Hammarlund SP-600 IF output versions and mods

[Richard Knoppow]

----- Original Message ----- 
From: "Al Parker" <anchor at ec.rr.com>
To: "R-390-List" <R-390 at mailman.qth.net>; 
<Hammarlund at mailman.qth.net>
Sent: Friday, May 03, 2013 2:43 PM
Subject: Re: [Hammarlund] Hammarlund SP-600 IF output 
versions and mods


> (I thought this went to the list ystdy, but didn't)
>
> hi Charles, et al,
>     I don't presently have a late model (after ~s/n 
> 17,000) which has factory disc ceramics and/or the ver. 3 
> IF output.
>     I do have an SP-600-JX-28, which is an even later 
> (apparently) version, with disc ceramics, and a different 
> method of construction.  It uses many terminal boards 
> rather than much point to point wiring, and also has a 
> different manner of developing AVC voltage.  That makes 
> the take-off of the IF signal to the IF output jack a bit 
> different, maybe Version 4 (or V.5, as the SP-600 VLF is 
> different yet, I think).
>     The JX-28 takes the IF signal for AVC before the BFO, 
> so the BFO can be used with AVC.
>     Mine -28 is presently not giving as much AVC voltage 
> as it should, in my opinion, and I haven't figured just 
> why yet.  There were only 100 of these made, so not a lot 
> of heads can get together to figure out glitches.
>     I've att. a .pdf file for Charles with the diagram(s), 
> if anyone else would like it, let me know directly.
> 73,
>
> Al, W8UT
> www.boatanchors.org
> www.hammarlund.info
>

     I would like a copy of the circuit.  I know these 
receivers exist but have never seen a schematic.
     How much AVC voltage are you getting and how much do 
you think you should be getting?  Also, where are you 
measuring and what sort of meter are you using?


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com