Hi Larry
Thanks for the reply.
My QSE V10 signals are all getting through to the output multiplexer. I've managed to raise the multiplexer inputs to around 400mV pk-pk and that has made a big improvement to the QSE output.? The spurs I mentioned before are not visible - suspicious but not complaining!
In parallel with that I've increased the attenuation on the PA input reducing the PA drive by about 10dB.? Long term, if this works, I'll change the preamp.to give less gain.
With those changes I've just had a 5&5 contact on SSB with a station in Kent (I'm in Edinburgh).? Conditions were not good but I got through OK with about 10W on 40m. He commented that the audio was very good except that it was very bassy which fits with what I'm seeing on the SDRPlay/SDRUno.? Ive tried to alter the audio by using the equalisation option.? It sets up fine but I don't think it's doing anything.
The noise is still there on TX although a lot smaller in proportion because I'm using a bigger drive signal.
I don't have any filter in the connection from QSE to PA.
I would like to raise the 400mV signal into the multiplexer.? I tried changing the scaling in
arm_scale_f32(float_buffer_L_EX, 20, float_buffer_L_EX, 2048); //Scale to compensate for losses in Interpolation??
I changed 20 to 40 and higher but it didn't seem to make any difference.? As they say it was worth a try!
I would like to raise the 400mV to probably 1.5V or even more.
Once I maximise the output of the QSE I'll reduce the PA preamp gain.
Thanks?
Harry? GM3RVL
