From: <richard.dodson_at_email.protected>
Date: Mon, 17 Aug 2009 14:07:13 +0800

Hi

  I am sure you guys know the system best .. but - as Hayley is saying
I think - there is detectable phase coherence (i.e. common to both
frequencies) for the data at Ceduna, but it is rapidly (timescales on
the order of ten seconds) varying about 1 radian. Thus I don't think
it is thermal (as that should just be a random phase spread, not a
wander (correct?)).

 I note that V255 and V257 look pretty good.

        Richard

>>Below is a copy of the email I sent to Jim and Simon last Friday. I think
>it's quite possible that there are very short phase jumps that could cause
>the loss of gain at the high frequencies in the Ceduna data. But since the
>phase is very stable long term at the lower frequencies (S band), then the
>phase must quickly return to the maser standard (on a time scale short
>relative to the correlator averaging time).

>As I see it the problem is not big phase jumps but low-level, rapid
>fluctuations.
>
Received on 2009-08-17 16:07:34