[evlatests] Ant11 4 meter problems #2

[Dan Mertely]

PPS:  Given what I found, would you still like to
have the H/V polarizations swapped at the input to
the 74 MHz box?

-Mert


Dan Mertely wrote:
> At Chuck's request, I just went out and traced the
> ant11 4m RF path from the external X-dipole feedlines,
> through the feedcone bulkhead, to the 74 MHz box, out
> the 74 MHz box to the LOIF rack input bulkhead, and from
> the LOIF rack input bulkhead to the T301 4/P converter
> module.  *All RF cabling appears correct* as shown in
> the attached Gerry Petencin drawing from 1998(with my EVLA mods).
> 
> The only (minor) thing I saw wrong was that the inside,
> feedcone bulkhead type N connector was about 1.5 turns
> loose.  I tightened it.   This check and adjustment was
> done between 11:30 and 12:15 today.
> 
> -Mert
> 
> 
> Ken Sowinski wrote:
>> On Thu, 9 Aug 2007, Ken Sowinski wrote:
>>
>>> The Flukes are not set right, so all the VLA antennas are not
>>> coherent with eVLA antennas.  There might be even more wrong
>>> with VLA antennas.
>>
>> This occured when using the default frequency for 4 meters
>> because the wrong value was entered in the data base.
>> In addition the alternate input switches were not being
>> set for 4 meters; the fix for this has been commited.
>>
>>> The working EVLA antennas seem to be polarized at random.
>>> 11, 17 and 26 are in one state;
>>> 18, 19, 21, 23 are in the other.
>>> Without a clearer majority I am not willing to say which group
>>> is correct.
>>
>> There is now some evidence that the group including 11, 17 and 26
>> are wrong.
>>
>> About 15 minutes of data were taken for Rick with everything
>> owrking so that he can provide a summary of what works and
>> what does not.
>>
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