[time-nuts] 5061a now look at wrong freq A1 fault
hbonhorst at freenet.de
Sat Feb 27 07:07:13 UTC 2010
I fully agree to John's instructions. TvB should have the manual on his web
site. If peeking is correct, check for phase alignement as well. Did you
replace the capacitor C49 about 10 uF on Synthesizer board? If it did not
fail, it will soon and start eating traces of PC board. If you need further
assistance or spare parts from Germany do not hesitate to contact me
Von: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] Im
Auftrag von John Miles
Gesendet: Samstag, 27. Februar 2010 05:38
An: Discussion of precise time and frequency measurement
Betreff: Re: [time-nuts] 5061a now look at wrong freq A1 fault
I think the best policy re: initial setup of the 5061A is to follow the
manual. There are clear instructions on how to set the beam current and
second harmonic indications and tune the OCXO to find the central peak. If
it is locked but not exactly at 5 MHz, either your C-field is grossly off,
or (more likely) you are tuned to a side peak. But the beam current should
be verified before worrying about that.
-- john, KE5FX
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of Dott. Alfredo Rosati
> Sent: Friday, February 26, 2010 7:36 PM
> To: J. L. Trantham; time-nuts at febo.com
> Subject: Re: [time-nuts] 5061a now look at wrong freq A1 fault
> the problem was in the syinthesizer board A1 , the xtal oscillator
> 12.63 was to much aging and was at the limit of pll , now I fixed this
> board , now the 12.63 signal is clear and loocked , before was
> very noisy .
> But seeme there are more problem , the signal now is very close to
> 5MHZ but there are some difference from my rubidium and my Z3805a
> The 5 MHZ now is near 5 x 10-10 .
> Now I need to ascertain , if there are more fault , or because I have an
> high performance tube , I need a degausser ??????
> I will continue to study .
> all suggestion will be appreciated
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