If you set a level offset for high mode and want to generate a signal, the level changes on switching on.
For example:
My setting: leveloffset high output -2.3
If I switch to high output mode and set a frequency of 500MHz and a level of -30dBm it's changing to -30.3dBm at switching on.
If I use -20dBm and switch on, ot changes to -7.3dBm.
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Klaus, DL5KV