[evlatests] RFI birdie in Ka-band

[Rick Perley]

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.


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?
> |>
> |>
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