[Premium-Rx] Collins 651S-1 - it's alive!

[Al Klase]

Hi Nick,

Glad to here you got that set playing.  I'm always amazed how assembly 
errors like that can linger for decades, and jump out an bite you in the 
butt.   I'm also impressed by the reliability of these things.  I'm 
guessing it's 40 years old.

You inspired me to pull mine off the shelf, and hook it up.  I'm 
listening to the gang on 3885 as I type.  I need to figure out exactly 
what this is.  It has the green vacuum-florescent displays, FM detector, 
and appears to have the remote option.

An amazing radio for 1971.  Of course, the same money would have bought 
a Porsche 911-S.

VY 73,
Al

On 5/30/2019 3:26 PM, Nick England wrote:
>   Thanks for all the suggestions and encouragement.
> Tacking wires onto the A14 board and scoping showed that the 10's of MHz
> counter was counting OK, just putting 00 onto the backplane. While checking
> out if the problem was with the other boards connected to these two bits, I
> discovered that those two lines were shorted together somewhere in the
> multi-layer backplane. Luckily the short wasn't in buried lines, but a
> teensy solder bridge hidden under a support bar and too small to see
> without lots of magnification - who'd have thunk it!
> Now I have a receiver that goes up to 29.9999 MHz instead of just 9.9999
> And removing/inserting cards cleared up my LSB/ISB issue, so all that's
> left is fixing the meter lamp.
>
> An interesting discovery was that the DFCE card is labeled "PROPERTY OF
> 651S-1 ENGR. GRP." - I wonder what the story is on that......
>
> Again, many thanks for the helpful replies to my request for advice.
>
> Cheers,
> Nick England K4NYW
> www.navy-radio.com
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-- 
Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/