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<p class="MsoNormal"><span style="font-size:11.0pt">I think I sent this to Rick only yesterday:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">The AMISR incoherent scatter radar operates over 430–450 MHz, so this would be pretty close to their band centre.</span><span style="color:#212121">
</span><span style="font-size:11.0pt">They’re pretty powerful as well.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Robert<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">evlatests <evlatests-bounces@listmgr.nrao.edu> on behalf of Sergio Garza via evlatests <evlatests@listmgr.nrao.edu><br>
<b>Date: </b>Monday, November 13, 2023 at 7:36 PM<br>
<b>To: </b>evlatests@listmgr.nrao.edu <evlatests@listmgr.nrao.edu><br>
<b>Subject: </b>Re: [evlatests] Circularly polarized reflected lunar emission {External} {External}<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:11.0pt">Would it be a possibility this is a lunar reflection of PAVE PAWS Radar
<br>
Systems and similar anti-ballistic missile early-warning systems?<br>
<br>
Taiwan and China have their own versions but they're all based on and <br>
similar to US military/Raytheon's system. Many of these systems have <br>
frequency ranges between 420 - 450 MHz and pointed at the horizon and <br>
higher.<br>
<br>
Here's some specifications for PAVE PAWS:<br>
</span><a href="https://spp.fas.org/military/program/track/pavepaws.htm"><span style="font-size:11.0pt">https://spp.fas.org/military/program/track/pavepaws.htm</span></a><span style="font-size:11.0pt"><br>
<br>
Here's the original environmental report with extra details although the <br>
system (I believe) has since been upgraded:<br>
<br>
</span><a href="https://apps.dtic.mil/sti/tr/pdf/ADA088320.pdf"><span style="font-size:11.0pt">https://apps.dtic.mil/sti/tr/pdf/ADA088320.pdf</span></a><span style="font-size:11.0pt"><br>
<br>
There are several other and various systems around the world, all of <br>
which always on. Presumably if this is the case, there are other <br>
frequency ranges that reflect at different lunar orientations as well.<br>
<br>
Sergio<br>
<br>
<br>
On 11/13/23 6:08 PM, Ken Kellermann via evlatests wrote:<br>
> Dave is correct. At any given time it is not unlikely that some amateurs could be using this band for EME communication especially on a weekend and more especially when the moon is near perigee. However the BW for any individual signal would be only about
3 KHz for SSB and much less for CW or digital modes. Amateur TV is allowed in this band but that would normally be line of sight. I don’t think TV EME is feasible from any amateur station.<br>
> Ken<br>
><br>
> Sent from my iPad<br>
><br>
>> On Nov 13, 2023, at 7:50 PM, David Schafer via evlatests <evlatests@listmgr.nrao.edu> wrote:<br>
>><br>
>> The band 430MHz - 440MHz is allocated by the ITU for radio amateur operation and I recall this band being fairly popular for Earth-Moon-Earth (Moon Bounce) communication. I do not know about the possibility of these amateur stations being active most or
all of the time. This type of communication certainly operates in a bandwidth << 1MHz.<br>
>><br>
>> Dave<br>
>><br>
>> -----Original Message-----<br>
>> From: evlatests <evlatests-bounces@listmgr.nrao.edu> On Behalf Of Rick Perley via evlatests<br>
>> Sent: Monday, November 13, 2023 5:02 PM<br>
>> To: evlatests@listmgr.nrao.edu<br>
>> Subject: [evlatests] Circularly polarized reflected lunar emission<br>
>><br>
>> Our lunar observations often show reflected terrestrial RFI at certain times and frequencies.<br>
>><br>
>> The data taken November 4 shows quite a spectacular example of this. I've looked, on a single ten-minute scan, for reflected circularly polarized emission in the frequency bands: 288 -- 352 MHz, and 384 --<br>
>> 448 MHz. The channelwidth was 1 MHz.<br>
>><br>
>> Three channels showed remarkably strong emission (at about 1 Jy level):<br>
>><br>
>> 437, 438, and 439 MHz. No other frequencies showed anything. The typical rms noise is about 20 mJy.<br>
>><br>
>> This is not local RFI -- it has to originate 'somewhere on earth'. Although I haven't yet checked every scan, the evidence strongly suggests it is on most of the time.<br>
>><br>
>> Does anybody have any ideas?<br>
>><br>
>> Rick<br>
>><br>
>><br>
>> _______________________________________________<br>
>> evlatests mailing list<br>
>> evlatests@listmgr.nrao.edu<br>
>> </span><a href="https://listmgr.nrao.edu/mailman/listinfo/evlatests"><span style="font-size:11.0pt">https://listmgr.nrao.edu/mailman/listinfo/evlatests</span></a><span style="font-size:11.0pt"><br>
>><br>
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>> evlatests mailing list<br>
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> _______________________________________________<br>
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