Comments (4)
I have checked with two different mcHFs: I cannot reproduce. Maximum output power is not dependent on CMP level. Of course output power of speech increases significantly when higher CMP levels are set: that is what compression should do. So I need confirmations about an issue here. Please do not check power with power sliders: they are too inaccurate. Best way of watching output is with a dummy load and an oscilloscope.
from uhsdr.
To clarify: output power depends on CMP OFF/ON status, not CMP level set.
At http://d.wojtus.net/mcHF there's a video recording and also voice recording from remote SDR, where I cycle from OFF, then 0..3.....12 and back to OFF. This gives obvious impression of reduced power (please not: at the end of the recording I said by mistake "compression zero", while it was "OFF").
I'll try to add some oscilloscope metering later on.
from uhsdr.
OK, I've made measurement with a scope and I've found that CMP does work perfectly. It's the CMP=OFF state when actual Tx power brutally exceeds PA settings. Video to watch this behaviour here: http://d.wojtus.net/mcHF/mcHF_cmp_power.mp4
Whether this is a bug or not - please decide.
from uhsdr.
You are right. This does not bother much because you can use CMP=0 instead of OFF. So I decide to leave it as it is because it is not trivial to solve.
from uhsdr.
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from uhsdr.