[evlatests] P-Band

[Charles Kutz]

For the interim we can power down the EVLA P-Bands for that observation 
if we do not have the "fix" in at that time.

Chuck

Craig Walker wrote:
> There is going to be a VLBI observation of the methanol maser on October 
> 31 (GB063A) using Y1.  The exact frequency of the maser is 6668.5192 
> MHz.  The observation will also observe continuum sources using the 
> frequency range 6621-6699 MHz.  Is the "6.7" GHz signal in those bands?
> 
> Craig
> 
> 
> 
> Claire Chandler wrote:
>> They may not affect overall power levels but 6.7 GHz coincides with 
>> the methanol maser frequency and we may have upcoming observations at 
>> this frequency that would be affected.
>>
>> Claire
>>
>> On Thu, 11 Oct 2007, Charles Kutz wrote:
>>
>>> The P-Band receivers in antenna 11 and 21 have been turned back on.
>>> These units generate strong C-Band RFI at ~ 6.7GHz in antenna 11 and,
>>> ~6.7GHZ and ~6.9GHz in antenna 21. We are working on the root cause and
>>> the solution.
>>> We are in the process of documenting other observed occurrences in other
>>> EVLA antennas. These signals are there and may be a nuisance only. These
>>> "birdies" should not have a large impact on observations since they are
>>> low enough in power that they do not affect leveling in the T304 and are
>>> CW signals that appear to be very stable in frequency.
>>>
>>> We are working on it.
>>>
>>> Chuck
>>>
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> 
>