[time-nuts] FE-5680A sweep range setting

Ed Palmer ed_palmer at sasktel.net
Sun Feb 23 22:33:57 EST 2014

I also have a 5680A with that strange little board.  On a hunch, I 
disconnected the orange wire and injected a DC voltage into the main 
board.  It caused the frequency to change.  I don't know if it's the 
C-field control or another mechanism, but the result is the same.


On 2/23/2014 4:01 PM, Simon Lyons wrote:
> OK ... I have C245 on the middle board, same as you. Tweaking it and ...
> Hmmm, it does affect the range (twitchy is an understatement!) but 
> still no lock. To be continued....
> Now by the 'frequency control board' do you mean the board that 
> overlaps the top of the D-Sub connector? I have been at a loss to 
> understand this section. There is all sorts of silicon on it but no 
> inputs of any kind. Just a 5V supply and a single analog output of 
> 1.99V on the orange wire. I'm baffled, so if you know what this board 
> is doing, please tell!

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