[evlatests] New (?) Ka-band birdie

[Rick Perley]

Dan:

     Only the short baselines see this -- it's A configuration at a high 
frequency, so the fringe-winding is very effective in reducing it.

     However -- important new information has been found.  The same 
birdie was seen in Q-band!  That is, the RFI line was seen in the same 
SPW, (#4) in the same channel (#49).  The frequency of course is 
different.  So it seems to have something to do with the IF frequency, 
not the RF.

     Rick

On 11/17/2016 09:14 AM, Dan Mertely wrote:
> Hi Rick.  Was that on all baselines, or was it seen
> "favoring" certain baselines?  TNX.
> -Mert
>
> On 11/16/2016 3:52 PM, Rick Perley wrote:
>>      In data taken in both B and A configurations, I find a strong (>
>> 500 Jy in 2 MHz channelwidth) birdie at:
>>
>>      30976 = 242*128 MHz.
>>
>>      So it looks like a harmonic of 128 MHz ... but ... there are *no*
>> other birdies visible in the entire 8 GHz width (30.5 through 38.5 GHz).
>>
>>      I can't find this in my old spectral sweeps.
>>
>>
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