Does the radio do this (FT8 40M) same into a dummy load?
Can you measure power with an external power meter (if you are not already doing this)?
Can you measure DC supply current going into the radio on 40M vs other bands during FT8 transmit mode?
Dave
On Thursday, June 10, 2021, 10:08:33 AM MDT, <n3rsy@...> wrote:
Trying to get 10 watts for FT8 for 40m.
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I can get 10 watts for FT8 on 20m.
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I can get 10 watts with other modes on 40m.
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Using a 20m/40m OCF antenna.
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Using a creative labs USB sound card with a REM/DATA cable, also tried a Sabrent USB sound card with same results.
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SWR is 1.6, and ALC is 0 for 40m, so it shouldn't be pulling back on power.
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The most I can get is 6.6 watts for 40m.
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On 20m I can get 9.9 watts with an swr around 2.3.
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Any ideas?
