Yes It took me several tries to find the spot, I only had success when I
began only moving it in tiny increments I was not getting anywhere with
1/4 or 1/8 turn adjustments, and you should leave it a few minutes on
each try when mine finally did lock is started at a little over 10MHz
and then dipped down 300 - 400 Hz below and wander around a bit down
there, and I was ready to turn it off and tweak it again when it started
back up and went across 10MHz and then it wandered back and forth across
the 10MHz line before it finally locked. I just ran across another
reference to that C245
http://www.febo.com/pipermail/time-nuts/2013-January/073442.html.
What I was referring to as the frequency control board does look like it
would be mounted over the DB9 connector. The two that I just got do not
have this board installed on the pictures link I posted it is at the
center of IMGP2309_m and IMGP2310_m. At
http://ko4bb.com/dokuwiki/doku.php?id=precision_timing:fe5680a_faq there
is a short comment about this card under "Electronic Frequency Control
(EFC)" beyond that I do not know anything about the function of this card.
Paul.
On 2/23/14 6:01 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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