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What is an appropriate TXDelay to use for a THP 1.5KFX amp
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Doug Seyler
Member ✭✭
I have a THP 1.5KFX amp that I have been using with the 6300 on SSB and it works fine without any TXDelay. However, when I try CW it trips the Pr (reflected power) safety, even with fairly low drive power and a resonant antenna. I suspect that I need to put in a small TXDelay. Any suggestions short of incrementally increasing it until it doesn't trip?
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Answers
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Hi Doug,
the ARRL "TOR" test was for ancient PACTOR and AMTOR digital programs that required a T/R time of 20ms of less. In the "old days" there were many rigs that met this requirement. However recent rigs vary quite a bit in their T/R times. If I remember correctly, a dit at 40WPM = 20ms.
To avoid "hot switching" I would recommend 40ms or greater and see how it works out for your favorite speed and switching circuits.
GL de Ken N9VV
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Doug, you might find this chart interesting. Go to the right hand columns and you will see the ARRL T/R test results for various modern Transceivers;
<URL: http://www.remeeus.eu/hamradio/pa1hr/productreview.htm >
GL de Ken N9VV0 -
I had the same problem with my 6300 and THP. I am using 5 ms TX delay and it works fine. No more Pr errors.0
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Thanks, guys, for all of the help!
Doug WB5TKI
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