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

[Ken Sowinski]

On Fri, 15 Jan 2021, Vivek Dhawan via evlatests wrote:

>
> on second (or rather the first real) thought, my statement is
> false if the firstLO is not a exact multiple of 128.

But the first LO is constrained to be a multiple of 128.
See my email of a moment ago.

> On Fri, January 15, 2021 10:37, Vivek Dhawan via evlatests wrote:
> | Ken, Rick,
> |
> | I believe it cannot be a harmonic of 128, because any of
> | these falls in a null between subbands, by construction.
> |
> | 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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