[evlatests] More Q-band oddities

[Michiel Brentjens]

On 11/01/2011 02:08 PM, Michiel Brentjens wrote:
> 7C is understood now: its bandpasses show the failure to reset from 3bit mode to 8 bit mode.
>
> - Michiel

Same for 23AC, except that 23AC only show the per-subband delay, not the strongly sloping  linear band passes.

- 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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