I see that there is a 5061 on epray with the usual evasive statement to the
effect that the seller is completely ignorant except it turns on. Is the Cs
tube liable to be OK? If so, I feel competent to fix anything else that does
not call for esoteric or exceedingly rare parts :-)
I just don't want the incredible expense of a new tube, if available at all,
or else having to resell without lying by omission (a tactic I occasionally
find on epray)
Thanks!
Don
----- Original Message -----
From: "v. Bonhorst" <[email protected]>
To: "'Discussion of precise time and frequency measurement'"
<[email protected]>
Sent: Saturday, February 27, 2010 12:07 AM
Subject: Re: [time-nuts] 5061a now look at wrong freq A1 fault
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
offline.
Hubert, DB7ME
-----Ursprüngliche Nachricht-----
Von: [email protected] [mailto:[email protected]] 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: [email protected] [mailto:[email protected]]on
Behalf Of Dott. Alfredo Rosati
Sent: Friday, February 26, 2010 7:36 PM
To: J. L. Trantham; [email protected]
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
i5uxj
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