Make sure you have no equalizing in the audio output somewhere (that is
important for any transceiver, btw). Also check the SSBA and SSBC
options in the menu, maybe the selected compression ratio is not ideal
for FT8. See KSB2 manual regarding "PowerControl and ALC".
You could test this with one of the many function generators available
as an app on your smartphone.
This does not explain the band dependency, though. Maybe 80/40 are tuned
good enough to easily achieve the power levels, while the upper bands
are a bit more fragile to produce full output, if not tuned 100% correctly.
73/55 Gernot DF5RF
Am 03.12.2019 um 09:22 schrieb Markku Siipola:
I have started to use my K2 for FT8, with the KIO2 digital interface
and the SSB-module. My sound card is connected to the hear phone and
microfon connections. Software WSJT-X, JTAlert and DXLab commander.
On 80m and 40m all is ok, but not on the higher bands. For example on
20 m, the power is reduce very much for certain LF frequences. I
tested this by using the TUNE function in WSJT-X and changing the TX
frequence.
LF Power
400 7
500 3
600 3
700 4
800 7
900 7
1000 7
1100 7
1200 7
1300 4
1400 2
1500 1 <---
1600 1 <---
1700 2
1800 3
1900 5
2000 7
The same problem is also on the remaining high bands
What can be wrong?
73 de SM5FLM
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