Title: Power output down, red (TX) light flashing
Post by: S58J on 24. September 2019, 06:45:53
Hi
Together with Marko, S54AM we are struggling to identify the erratic behaviour of his mcHF. They appeared suddenly after years of normal use, after latest FW upgrade.
The simptoms:
Power ON procedure - OK
Receiver - OK
Transmit - OK (with nominal power) for a couple of seconds than power goes down and RED (TX) LED is flashing maybe another 2 seconds after end of TX.
When restarting (Power OFF / ON) the simptoms start to repeat as listed above.
Any idea?
Kind regards
Janez, S58J |
Title: Re:Power output down, red (TX) light flashing
Post by: DL8EBD on 24. September 2019, 06:57:10
Janez, maybe a starting point:
Look in the menu "Debug/ Exper. Settings" under "VSWR Protect.threshold". You can set this to "Off" if there is a SWR limit set.
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Title: Re:Power output down, red (TX) light flashing
Post by: S58J on 24. September 2019, 08:17:28
Hi Thomas
Thanks for your proposal. Before doing that I have to tell you that the same thing happens with dummy load (SWR 1:1.0) connected.
Kind regards
Janez, S58J |
Title: Re:Power output down, red (TX) light flashing
Post by: DF8OE on 24. September 2019, 08:21:13
SWR detection is very poor. Additionally there is no way to match an outdoor antenna if output power is reduced at bad SWR. I do not see any sense in powering down at bad SWR so I never activated this setting. I am nearly sure you should do it, too.
vy 73
Andreas |
Title: Re:Power output down, red (TX) light flashing
Post by: S58J on 24. September 2019, 11:35:22
Thank you Thomas, thank you Andreas.
Your proposal solved the problem! We can close this thread.
Marko, S54AM also send you both a big thank you.
Kind regards
Janez, S58J |
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