[evlatests] RFI birdie in Ka-band

[Ken Sowinski]

On Thu, 17 Aug 2023, Rick Perley via evlatests wrote:

> My tuning setup did not include this well-known super-birdie.  The bottom 
> frequency I used was 30476 MHz.
> The 'new' birdie is much weaker than the 29440 MHz one.

Iy would be instructive to look at the LoIfSetup.  When was
this done and what was the project name?

Ken


> On 8/17/23 11:43 AM, Vivek Dhawan via evlatests wrote:
>>  The 30976 is not seen in the most recent RFI sweep.
>>  There is a very strong 29440 = 128*230.
>>
>>  These might depend on how the LOs are set, and might
>>  be leaking into the IF(s) not at the sky frequency.
>>
>>  look here:
>>
>>  http://www.vla.nrao.edu/astro/RFI/Jul23_A/RFI_Ka.pdf
>>
>>  On Thu, August 17, 2023 11:33, Sergio Garza via evlatests wrote:
>> |  It might be useful to contact Chenoa Tremblay about birdies. I believe
>> |  COSMIC SETI has several recorded instances of birdies in their data
>> |  which could add to this thread.
>> | 
>> |  Sergio
>> | 
>> |  On 8/17/23 11:25 AM, Rick Perley via evlatests wrote:
>> |>  I find a fairly strong 'birdie' in Ka-band -- at 30.976 GHz. This is
>> |>  the 242nd multiple of 128 MHz.  Don't know if this is relevant ...
>> |> 
>> |>  No other birdies are seen in this band.
>> |> 
>> |>  Any ideas?
>> |> 
>> |> 
>> |>  _______________________________________________
>> |>  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
>> |
>>
>>
>>  _______________________________________________
>>  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
>
>