From: <David.Jauncey_at_email.protected>
Date: Tue, 26 Apr 2005 12:55:20 +1000

Dear Brett,

Thanks for your e-mails. In regard to the "drift" of the NZ Rubidium I
still have a couple of concerns, as your 180 degree (= pi radians)
"drift" in 2 hours corresponds to 200 pi radians in 2 hours, or about 2
pi radians per minute at 2 GHz.

Your thoughts/comments would be most welcome.

Cheers and many thanks for spending so much time working with Steven and
the Kiwis,

Dave

-----Original Message-----
From: owner-vlbiobs_at_atnf.csiro.au [mailto:owner-vlbiobs_at_atnf.csiro.au]
On Behalf Of Brett Reid
Sent: Friday, April 22, 2005 10:47 PM
To: Phillips, Chris (ATNF, Marsfield)
Cc: vlbiobs_at_atnf.csiro.au; stingay_at_astro.swin.edu.au
Subject: Re: Progress toward New Zealand VLBI

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 2005-04-26 12:55:38