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Can anyone tell me if there is something I can do in the
existing GNU software which will limit the output of a TX daughter board to a
preset maximum? We are using the LFTX daughter boards. We are running the TX output to an amp that will boost the
signal up to ~8 watts, and are already using the gain settings to adjust the TX
output. The problem is that voice transmission has a lot of spikes on
things like ‘p’ and ‘c’ sounds or blowing into the microphone.
To prevent blowing the amp we have had to adjust our TX gain such that the
spikes stay below ~170mV (peak-to-peak). With this we are only getting
about 2-3 watts PEP on normal speech. We would like to allow more gain –
getting us closer to 8 watts – and just “clip” the spikes to
protect the amp. I know this can be done in hardware between the USRP and amp,
but would rather do it in software if possible. Brian Johnson Kutta
Consulting Inc. Work:
602-896-1976 Cell
: 623-451-9417 |
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