Just worked the last two passes of AO91 and experiencing deep fading.I am using a pair of Gulf Alfa CP yagis and do not normally see fading issues. Any thoughts? Jim KI6WJ
Jim, Glad it wasn't just me. I experienced the same on this last pass of AO-91 and I use the Hy-Gain satellite antennas. 73, Scott, KA7FVV Director - KBARA kbara.orgAlternate Board of Director - AMSAT amsat.org Co-Owner WA7DRE 443.525 System Fusion Repeater Co-Owner KA7FVV 147.320 KBARA Repeater http://www.ka7fvv.net
From: James Brown [email protected] To: AMSAT BB [email protected] Sent: Monday, October 29, 2018 1:46 PM Subject: [amsat-bb] fading?
Just worked the last two passes of AO91 and experiencing deep fading.I am using a pair of Gulf Alfa CP yagis and do not normally see fading issues. Any thoughts? Jim KI6WJ _______________________________________________ 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
Hi Scott!
Good to hear you on AO-91 this afternoon - a benefit of a work-from-home schedule. Easier to take a "smoke break" in the front yard with a radio, than at the office on a balcony with a lot of RF to deal with. :-)
I had fading during the first half of the pass, and not so much after the midpoint. By the time I heard you, I wasn't dealing with fading. Even twisting my Elk around, there were points in the first half of the pass where the fading was still getting in the way.
73!
Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/ Twitter: @WD9EWK or http://twitter.com/WD9EWK
On Mon, Oct 29, 2018 at 9:51 PM Scott Harvey via AMSAT-BB < [email protected]> wrote:
Jim, Glad it wasn't just me. I experienced the same on this last pass of AO-91 and I use the Hy-Gain satellite antennas. 73, Scott, KA7FVV Director - KBARA kbara.orgAlternate Board of Director - AMSAT amsat.org Co-Owner WA7DRE 443.525 System Fusion Repeater Co-Owner KA7FVV 147.320 KBARA Repeater http://www.ka7fvv.net
On 10/29/18 4:56 PM, Patrick STODDARD (WD9EWK/VA7EWK) wrote:
I had fading during the first half of the pass, and not so much after the midpoint. By the time I heard you, I wasn't dealing with fading. Even twisting my Elk around, there were points in the first half of the pass where the fading was still getting in the way.
Interesting that the TXPA current dropped off somewhere between 176,750 and 182,000 (uptime, reset 27).
https://imagebin.ca/v/4KoXhTn5TTlx
--- Zach N0ZGO
That kind of looks like one low current point with a lot of space when there was no telemetry. Could have been just that the reading was taken before the Tx turned on for a beacon in idle mode.
Fading could be due to the satellite just rotating such that the antenna is pointing right at you (or right away from you) or something like that. At least that's what the Technician test (that I've been teaching and VEing) says :-)
On Mon, Oct 29, 2018 at 6:43 PM Zach Metzinger [email protected] wrote:
On 10/29/18 4:56 PM, Patrick STODDARD (WD9EWK/VA7EWK) wrote:
I had fading during the first half of the pass, and not so much after the midpoint. By the time I heard you, I wasn't dealing with fading. Even twisting my Elk around, there were points in the first half of the pass where the fading was still getting in the way.
Interesting that the TXPA current dropped off somewhere between 176,750 and 182,000 (uptime, reset 27).
https://imagebin.ca/v/4KoXhTn5TTlx
--- Zach N0ZGO _______________________________________________ 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
I've seen the fading cycle up and down in time consistently through at least a large part of a pass before with AO-85 and I'm pretty sure that's what it was.
On Tue, Oct 30, 2018 at 5:06 PM Burns Fisher [email protected] wrote:
That kind of looks like one low current point with a lot of space when there was no telemetry. Could have been just that the reading was taken before the Tx turned on for a beacon in idle mode.
Fading could be due to the satellite just rotating such that the antenna is pointing right at you (or right away from you) or something like that. At least that's what the Technician test (that I've been teaching and VEing) says :-)
On Mon, Oct 29, 2018 at 6:43 PM Zach Metzinger [email protected] wrote:
On 10/29/18 4:56 PM, Patrick STODDARD (WD9EWK/VA7EWK) wrote:
I had fading during the first half of the pass, and not so much after the midpoint. By the time I heard you, I wasn't dealing with fading. Even twisting my Elk around, there were points in the first half of the pass where the fading was still getting in the way.
Interesting that the TXPA current dropped off somewhere between 176,750 and 182,000 (uptime, reset 27).
https://imagebin.ca/v/4KoXhTn5TTlx
--- Zach N0ZGO _______________________________________________ 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
participants (6)
-
Burns Fisher -
James Brown -
John Brier -
Patrick STODDARD (WD9EWK/VA7EWK) -
Scott Harvey -
Zach Metzinger