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<div class="moz-cite-prefix">I think there is a misunderstanding
here. When I was referring to small jumps of 0.5 Hz (perhaps
larger in the 10/6m band) I was referring to the behavior of the
TCXO when it is enabled. If you have enabled the external clock
input then the TCXO is no longer involved in providing a 10 Mhz
reference to the fpga. If your GPSDO is not locking properly then
you are switching back and forth between your GPSDO providing the
10 Mhz reference, and no 10 Mhz reference. When there is no 10 Mhz
reference then the 122.88 Mhz VCXO is just free running, which can
easily be 30 to 40 Hz off. Hopefully an adjustment to your signal
level will fix the locking problem.<br>
<br>
John<br>
AC0ZG<br>
<br>
On 5/17/2013 11:28 PM, H.A.Meijer wrote:<br>
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<div class="moz-cite-prefix">Hi,<br>
thanks for your thoughts about the freq jumps from the 10MHz
osc.<br>
You are talking about "just 0,5 Hz' but my Hermes is jumping 30
to 40 Hz when on 10/6 mtr and with transverters (MF=28MHz) use.<br>
This is very annoying and for me not the so called "high
performance" I'm looking for.<br>
<br>
I did change the R141 and still see that is has some locking
problem to my external 10MHz, now and then.<br>
I will do some measurements at that circuit, maybe my 10MHz
level is to low..<br>
<br>
Bert<br>
<br>
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