[Premium-Rx] Collins 651-S1 optical encoder replacement

[NA NA]

Al,

There is an original 651S-1 optical tuning assembly for sale on eBay right now. I have purchased items from him in the past with and he is a reliable seller. That being said, I had problems with erratic tuning of my 651S-1 when first purchased several years ago and found that the end play of the shaft was critical for proper operation.  I installed several very thin shims on the shaft at the back of tuning assembly which cured the problem. 

I did purchase a COPAL RMS20-250-201-1 encoder to experiment with if that fix didn't work. This type is used on some Yaesu equipment. It has a fairly short shaft but that could be easily extended with a coupler if the original 651S-1 mounting standoffs were used and a plate made to mount the new encoder.

So far the original is still working fine, so I haven't had to try this out.

Les


> 
>     On February 6, 2018 at 12:56 PM Al via Premium-Rx <premium-rx at mailman.qth.net> wrote:
> 
>     I am looking for a replacement encoder for the Collins
>     651-S1. Bourns, etc part.
>     Al
> 
>     Sent from my iPad
> 
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