[evlatests] modcomp-free, Jun 26.

[Vivek Dhawan]

Rick:  From 18:46 to 18:46 the amplitudes gradually waned - but there
is no hint of any short drops the like of which you saw on Sunday;

i.e. the CMP losing its time is _not_ the cause of the short drops.

Also, the fringe rates did not accelerate (much) and are not so high
as to cause the amplitude drop, so that probably means a pointing
error - the antenna positions stopped updating, as you said.

for item 3: yes, 10s averaging, I should have said..

Rick Perley wrote:
>    Vivek:
> 
>    For item (2), did the 0.4 second amplitudes exhibit the pulsations I 
> saw -- or were they relatively unaffected by the time error?
> 
>    For Item (3), were the data taken with 10 second averaging, so the 
> fringeless behavior is due to the phase winding?

> Vivek Dhawan wrote:

>> 1. 18:25 to 18:45 - L band, many sources over a patch of sky about
>>     20x20 deg. Phases are flat (on each scan) and very clean, no hint
>>     of dropouts. (0.4s integration)
>>
>>     There is still a large dependence of phase with sky position,
>>     with W/E signature, only on VLA baselines. I have not tried to
>>     fit anything, but it seems clear that the ~1m baseline offset
>>     between E/VLA persists.
>>
>> 2. At 18:46 at the start of a scan the phases went loopy on VLA
>>     antennas: high rates for one scan, then fringes gone for the
>>     rest of the time. EVLA-EVLA baselines still good.
>>
>> 3. The sysstart scan on 3C84 at X-band was also fringeless on
>>     VLA antennas; EVLA-EVLA stayed good.
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>