[amsat-bb] Noise, distortion and fading on AO-92 L/v downlink

[Paul Stoetzer]

I was not on this particular pass, but I have heard these noises before and
do believe it to be L band radar interference.

73,

Paul, N8HM

On Mon, Dec 24, 2018 at 08:03 Mark L. Hammond <marklhammond at gmail.com>
wrote:

> FWIW, I was on the pass with Ron.  I'll confirm his observations, although
> I can't explain them ;)  On some of the uplinks (but not all!) it sounded
> like the 70cm "radar" noise, sort of.  Jeff KB2M even commented the same.
>
> Anyhow, we'll have more opportunities with future L/v sessions on AO-92
> and can see if it happens again...
>
> Mark N8MH
>
> At 11:18 PM 12/23/2018 -0600, Jerry Buxton wrote:
> >Hi Ron, The downlink is the same radio as the U/v, so from that
> perspective there is no particular reason that the L/v transmit signal
> would be different. The L/v uplink passes through a downconverter with an
> output of the same U frequency as the U/v uplink, directly into the
> receiver. If there was any distortion to the L/v signal it would likely
> occur in the downconverter path, but I haven't heard any other reports of
> problems. The first thing that comes to mind for rapid fading is satellite
> spin, I do not have any telemetry in front of me but if you check that out
> on FoxTelem or the website to see if it is spinning faster than last week,
> that might be a contributor. Noise then, if the satellite downconverter is
> working correctly, is probably on the uplink signals and may be greater
> than normal with the rapid fading. Jerry Buxton, NØJY On 12/23/2018 19:46,
> Ronald G. Parsons wrote: > Last night AO-92 L/v downlink seemed at times
> unusually noisy and distorted with rapid fading. Other I talked to on other
> sats and one ham in ZL land also mentioned it. I have not noticed this on
> AO-92 U/v, at least to this extent. My imagination or fact? > > Ron W5RKN >
> _______________________________________________ > Sent via
> AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available > to all
> interested persons worldwide without requiring membership. Opinions
> expressed > are solely those of the author, and do not reflect the official
> views of AMSAT-NA. > Not an AMSAT-NA member? Join now to support the
> amateur satellite program! > Subscription settings:
> http://www.amsat.org/mailman/listinfo/amsat-bb > >
> _______________________________________________ Sent via
> AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available to all
> interested persons worldwide without requiring membership. Opinions
> expressed are solely those of the author, and do not reflect the official
> views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur
> satellite program! Subscription settings:
> http://www.amsat.org/mailman/listinfo/amsat-bb
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>