[evlatests] New (?) RFI in Ka-band

Ken Sowinski ksowinsk at nrao.edu
Fri Jan 15 12:41:21 EST 2021


On Fri, 15 Jan 2021, Vivek Dhawan wrote:

> Ken, Rick,
>
> I believe it cannot be a harmonic of 128, because any of
> these falls in a null between subbands, by construction.

I don't think so.  The L302s are not restricted to multiples of
128 MHz.

> On Fri, January 15, 2021 09:24, rperley via evlatests wrote:
> | ... however, I'll note here that no other RFI spikes were seen in the
> | entire Ka band.  So why just this particular harmonic?
> |
> | Rick
> |
> | On 2021-01-15 11:14, Ken Sowinski wrote:
> |> On Thu, 14 Jan 2021, rperley via evlatests wrote:
> |>
> |>> New data, taken Tuesday afternoon, reveals an unresolved birdie in
> |>> Ka-band.
> |>> Frequency = 30.975 GHz.
> |>
> |> 128*242 = 30976
> |>
> |> That seems pretty close.
> |>
> |> Ken
> |>
> |>> Very strong -- equivalent to a couple of Jy in 128 MHz width.  (That's
> |>> BIG).
> |>>
> |>> Rick
> |>>
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