[evlatests] Circularly polarized reflected lunar emission {External} {External}

[Ken Kellermann]

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. 
Ken

Sent from my iPad

> On Nov 13, 2023, at 7:50 PM, David Schafer via evlatests <evlatests at listmgr.nrao.edu> wrote:
> 
> 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.
> 
> Dave
> 
> -----Original Message-----
> From: evlatests <evlatests-bounces at listmgr.nrao.edu> On Behalf Of Rick Perley via evlatests
> Sent: Monday, November 13, 2023 5:02 PM
> To: evlatests at listmgr.nrao.edu
> Subject: [evlatests] Circularly polarized reflected lunar emission
> 
> Our lunar observations often show reflected terrestrial RFI at certain times and frequencies.
> 
> 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 --
> 448 MHz.  The channelwidth was 1 MHz.
> 
> Three channels showed remarkably strong emission (at about 1 Jy level):
> 
> 437, 438, and 439 MHz.  No other frequencies showed anything. The typical rms noise is about 20 mJy.
> 
> 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.
> 
> Does anybody have any ideas?
> 
> Rick
> 
> 
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