Re: Progress toward New Zealand VLBI
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From: <brett.reid_at_email.protected>
Date: Fri, 22 Apr 2005 22:47:01 +1000
('binary' encoding is not supported, stored as-is)
Hi Chris,
On Fri, 22 Apr 2005 20:37:53 +1000 (EST) Chris Phillips wrote:
>Hi Steve,
>
>A couple of questions:
>
>- Were you using the NZ rubidium on the 14m?
Yes. Then we switched the 14m back from the rubidium to a common 5 MHz
synch (maser) and the fringes on the 5 Jy source were just a little stronger.
>- Did you do a test of the phase stability of the Rubidium compared
>to Hobarts masers?
Yes. First off the rubidium 10 MHz drifted 36 degrees in 5 minutes. Then
after a few slight twists of a trim pot the phase drifted only 180
degrees over 2 or more hours. This was viewing both 10 MHz waveforms on a
dual trace cro. No jitter was visible.
regards,
Brett.
Brett Reid
Observatory Manager, Radio Telescopes
University of Tasmania
School of Mathematics and Physics
phone + 61 3 6248 5285
email brett.reid_at_utas.edu.au
web http://www-ra.phys.utas.edu.au/~breid/
Received on 2005-04-22 22:47:29
Date: Fri, 22 Apr 2005 22:47:01 +1000
('binary' encoding is not supported, stored as-is)
Hi Chris,
On Fri, 22 Apr 2005 20:37:53 +1000 (EST) Chris Phillips wrote:
>Hi Steve,
>
>A couple of questions:
>
>- Were you using the NZ rubidium on the 14m?
Yes. Then we switched the 14m back from the rubidium to a common 5 MHz
synch (maser) and the fringes on the 5 Jy source were just a little stronger.
>- Did you do a test of the phase stability of the Rubidium compared
>to Hobarts masers?
Yes. First off the rubidium 10 MHz drifted 36 degrees in 5 minutes. Then
after a few slight twists of a trim pot the phase drifted only 180
degrees over 2 or more hours. This was viewing both 10 MHz waveforms on a
dual trace cro. No jitter was visible.
regards,
Brett.
Brett Reid
Observatory Manager, Radio Telescopes
University of Tasmania
School of Mathematics and Physics
phone + 61 3 6248 5285
email brett.reid_at_utas.edu.au
web http://www-ra.phys.utas.edu.au/~breid/
Received on 2005-04-22 22:47:29