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 [email protected] 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 [email protected]. 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 [email protected]. 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 [email protected]. 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