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

[Dave Parker]

I have no idea.

Dave

On 7/28/2021 9:39 AM, Ken Sowinski via evlatests wrote:
> Can anyone explain why this ancient message just appeared in my mailbox?
>
> Ken
>
>
> On Fri, 15 Jan 2021, Ken Sowinski via evlatests wrote:
>
>> On Fri, 15 Jan 2021, Wes Grammer via evlatests wrote:
>>
>>>  30976 MHz is the second harmonic of 15488 MHz, which is one of the 
>>> L301
>>>  tuning frequencies. A stretch, but was the L301 on any of the 
>>> antennas set
>>>  to this frequency during the observation?
>>
>> Bingo.
>>
>> L301-1: 15488
>> L301-2: 11904
>>
>> Irrelevant, but the L302s were: 12036, 13916, 14036, 11916
>>
>> I also note that this is not really new.  Rick lodged the same
>> complaint in November 2016.  At that time the strongest responce
>> was seen in ea25 with a few nearby antennas.
>>
>> Ken
>>
>>>  On 1/15/2021 10:42 AM, Ken Sowinski via evlatests wrote:
>>>>   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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