[wsjtgroup] Caution Urged in Using High Duty Cycle Digital Modes on Satellites
FYI from the wsjt Group
73, K7TRK
From: wsjtgroup@yahoogroups.com [mailto:wsjtgroup@yahoogroups.com] On Behalf Of Bob McGraw K4TAX RMcGraw@Blomand.net [wsjtgroup] Sent: Tuesday, October 31, 2017 6:05 PM To: Wsjt Subject: [wsjtgroup] Caution Urged in Using High Duty Cycle Digital Modes on Satellites
Satellite enthusiasts planning to try FT8 or MSK144 via satellite are being urged to use caution or possibly to avoid digital modes altogether in light of problems being blamed on the modes’ high duty cycle. Stations have reported problems getting into satellite transponders, even during favorable passes, which were traced to digital-mode signals in the transponder passband.
AMSAT News Service quoted an AMSAT-BB post (full thread) by Matthew Stevens, NJ4Y, who cited his recent experience with FO-29.
“Experimentation isn’t the problem, too much power is,” Stevens said. “It’s bad enough on SSB, worse with CW, and killer on constant duty cycle modes like FT8.” — Thanks to AMSAT News Service
Source: http://www.arrl.org/news/caution-urged-in-using-high-duty-cycle-digital-mode...
73 Bob, K4TAX
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Posted by: Bob McGraw K4TAX rmcgraw@blomand.net
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FYI from the wsjt Group
AMSAT is the original author of this message. It was first released in ANS-295: http://www.amsat.org/pipermail/ans/2017/000989.html
It is good that other news sources picked up on the message. Early reports indicated problems with these modes on the current satellites and discussed them on amsat-bb.
-- 73 de JoAnne K9JKM k9jkm@amsat.org
Recursive email lists? :-)
- Matthew nj4y
Sent from my iPhone
On Nov 1, 2017, at 22:15, JoAnne Maenpaa k9jkm@comcast.net wrote:
participants (3)
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JoAnne Maenpaa
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Matthew Stevens
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Ted