[evlatests] 1830 MHz birdie?

[Vivek Dhawan]

Hi guys,

I can take a look at L band today after test/maint is
done. will let you know. Does FRM need to be moving for
the purported signal to be seen or we just don't know yet.

We did a recent sweep for checking if the operator's
webcam made any RFI. I attach a plot from mar 11, pink=
webcam on, green = off,unplugged. the 1830 is about  1.5-2MHz
wide. stuff at 1785 is a mystery.


On 3/25/21 1:39 PM, Rob Long via evlatests wrote:
> Could this possibly be related to the L-band issue we have on ea22? We 
> know there is a huge interference from the FRM drive on ea22. I don't 
> think servo has been able to investigate yet.
>
> Rob
>
> On 3/25/2021 1:00 PM, rperley via evlatests wrote:
>> In some recent observing at L-band, an ubiquitous RFI spike was 
>> seen.  It is:
>>
>> - at 1830.0 MHz
>> - is seen on most, if not all antennas
>> - was present in every one of the 14 databases I have, all of which 
>> were taken at night
>> - seems to be spectrally unresolved
>>
>> It looks like an internal (or nearby) birdie.
>>
>> Can anybody suggest an origin?
>>
>> Rick
>>
>> _______________________________________________
>> evlatests mailing list
>> evlatests at listmgr.nrao.edu
>> https://listmgr.nrao.edu/mailman/listinfo/evlatests
>
> _______________________________________________
> evlatests mailing list
> evlatests at listmgr.nrao.edu
> https://listmgr.nrao.edu/mailman/listinfo/evlatests

-------------- next part --------------
A non-text attachment was scrubbed...
Name: L7.png
Type: image/png
Size: 13406 bytes
Desc: not available
URL: <http://listmgr.nrao.edu/pipermail/evlatests/attachments/20210325/87887c8e/attachment.png>