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<p>I have no idea.</p>
<p>Dave<br>
</p>
<div class="moz-cite-prefix">On 7/28/2021 9:39 AM, Ken Sowinski via
evlatests wrote:<br>
</div>
<blockquote type="cite"
cite="mid:d5d125c-284d-8935-adc7-4c52af8c2d8@aoc.nrao.edu">Can
anyone explain why this ancient message just appeared in my
mailbox?
<br>
<br>
Ken
<br>
<br>
<br>
On Fri, 15 Jan 2021, Ken Sowinski via evlatests wrote:
<br>
<br>
<blockquote type="cite">On Fri, 15 Jan 2021, Wes Grammer via
evlatests wrote:
<br>
<br>
<blockquote type="cite"> 30976 MHz is the second harmonic of
15488 MHz, which is one of the L301
<br>
tuning frequencies. A stretch, but was the L301 on any of the
antennas set
<br>
to this frequency during the observation?
<br>
</blockquote>
<br>
Bingo.
<br>
<br>
L301-1: 15488
<br>
L301-2: 11904
<br>
<br>
Irrelevant, but the L302s were: 12036, 13916, 14036, 11916
<br>
<br>
I also note that this is not really new. Rick lodged the same
<br>
complaint in November 2016. At that time the strongest responce
<br>
was seen in ea25 with a few nearby antennas.
<br>
<br>
Ken
<br>
<br>
<blockquote type="cite"> On 1/15/2021 10:42 AM, Ken Sowinski via
evlatests wrote:
<br>
<blockquote type="cite"> On Fri, 15 Jan 2021, Vivek Dhawan
via evlatests wrote:
<br>
<br>
<blockquote type="cite">
<br>
on second (or rather the first real) thought, my
statement is
<br>
false if the firstLO is not a exact multiple of 128.
<br>
</blockquote>
<br>
But the first LO is constrained to be a multiple of 128.
<br>
See my email of a moment ago.
<br>
<br>
<blockquote type="cite"> On Fri, January 15, 2021 10:37,
Vivek Dhawan via evlatests wrote:
<br>
| Ken, Rick,
<br>
| | I believe it cannot be a harmonic of 128, because
any of
<br>
| these falls in a null between subbands, by
construction.
<br>
| | On Fri, January 15, 2021 09:24, rperley via
evlatests wrote:
<br>
| | ... however, I'll note here that no other RFI spikes
were seen in
<br>
the
<br>
| | entire Ka band. So why just this particular
harmonic?
<br>
| | | | Rick
<br>
| | | | On 2021-01-15 11:14, Ken Sowinski wrote:
<br>
| |> On Thu, 14 Jan 2021, rperley via evlatests
wrote:
<br>
| |> | |>> New data, taken Tuesday afternoon,
reveals an unresolved birdie | |>> in
<br>
| |>> Ka-band.
<br>
| |>> Frequency = 30.975 GHz.
<br>
| |> | |> 128*242 = 30976
<br>
| |> | |> That seems pretty close.
<br>
| |> | |> Ken
<br>
| |> | |>> Very strong -- equivalent to a
couple of Jy in 128 MHz width.
<br>
(That's
<br>
| |>> BIG).
<br>
| |>> | |>> Rick
<br>
| |>> | |>>
_______________________________________________
<br>
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