[evlatests] More Q-band oddities

[Michiel Brentjens]

7C is understood now: its bandpasses show the failure to reset from 3bit mode to 8 bit mode.

- Michiel

On 11/01/2011 01:58 PM, Michiel Brentjens wrote:
> ** [2011-11-01 Tue 13:51] More Q-band oddities
>
> The antenna 7 Q-band system showed a couple oddities over the past
> weekend. First, the PDIFs of channel 7R behaved erratically, being
> sometimes piece-wise constant, and showing sharp excursions at other
> times. It varied by 20 - 40%. These variations were also present in
> the visibilities and were fully corrected after applying the PDIFs
> with AIPS task TYAPL. This smells like a problematic receiver.
>
> During the 3C454.3 observation after sunset, the delays of IF 7C were
> usually around 0.4 ns, but sometimes briefly jumped to 2.9 ns. The delay
> subsequently returned to its previous value. This occurred several
> times.
>
> The delay of 23AC was 80 (A) ns and 40 (C) ns at the first scan, but
> settled at a reasonable value from the second scan onwards.
>
> - Michiel
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