[evlatests] P-Band

[Craig Walker]

Do you have a more accurate frequency than "6.7 GHz"?  It is likely to 
be outside the band of interest in which I imagine it can be ignored, 
but I wanted to raise this flag just in case.

Cheers,

Craig


Charles Kutz wrote:
> 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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>>
>>


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