[R-1051] Frequency Standard Module

[Steve Hobensack]

Paul

I have six modules. Five of them work. None of them have the same circuitry. It seems like there are lots of revisions and upgrades, so it takes time to reverse engineer the board. This unit in question has no rf coupling transformers. It is all ceramic trimmers and cap/resistance tuned circuits! I'm guessing it  was made in the late seventies since there is also a pair of 14 pin dip ic's in the temperature bridge. Fair Radio still sells frequency standard modules. They seem to be repair depot discards. It's really a crap shoot on those.

Regards

Steve N8YE
 

> Date: Tue, 30 Dec 2014 17:08:52 -0500
> From: paulswedb at gmail.com
> To: r-1051 at mailman.qth.net
> Subject: Re: [R-1051] Frequency Standard Module
> 
> Steve
> The modules are quite old so lots can go wrong in the regenerative
> dividers. Heck how did they ever work in the first place? Black magic.
> That said The ceramic caps do oxidize with age and essentially when you
> adjust them they can go totally to heck with noisy spots. If possible
> obtain replacements I think ceramics are still around and they need to be
> new. NOS essentially can have the same issue.
> I have also seen the coils disintegrate. But that would not cause the issue
> you are describing.
> Good luck in the New Year.
> Regards
> Paul
> WB8TSL
> 
>(snip)