[R-1051] 5 mhz standard

[Jan Skirrow]

Hi Jerry ...

The crystals they used were temperamental and can go into some odd modes 
when the temperature of the oven is off, or just because they are 
getting old. High precision crystal were quite a work of high tech at 
the time!

I found that some of them required some time at the operating 
temperature before they'd "click" into the correct frequency. I was 
fortunate in finding a bunch of used modules from which I was able to 
salvage replacements for a couple I had that couldn't be tricked into 
working properly. I also found that defective ovens were not uncommon.

Be sure the oven is working correctly. The little thermistor thing they 
use to sense temp can be defective. If it is, the oven might never come 
on, or stay on all the time. I was never able to find an exact 
replacement for the thermistor they used - but I think something could 
be made to work. There are several different versions of these modules - 
some much newer than others.

Good luck! These babies are a %^$# to repair, but worth the effort.

73, Jan

Jerry Barnish wrote:
> Gentlemen:
>  
> I just found this web page today. I acquired an R1051B
> recently and found the 5mhz standard is not adustable..It is
> 170hz off frequency.
>  
> I would like to get it to where it is supposed to be.
> Having no idea how to fix  it and no schematics as of yet,
> does anyone have advice?
>  
>  
> Jerry WB2CAK
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