DB2OS Good idea to increase the dynamic range of the tpx. For me it needs some fiddling as I had the tpx noise 2 - 3 dB above the noise (after the 4 dB reduction).
Now the tpx noise sunk into the background noise and hence .. e.g. peak of the CW beacon now is ca. 18-19 dB and it was around 24-25 dB above the noise early this morning.
I support the remark from PY2SDR, in a sense that -given the tpx worst case requirements, as summarized in the Es'hailSat lecture in Geneva- with 95cm at the EoC, 60cm in the peak and 70-75cm dish sizes 'elsewhere' tpx noise must at least equalize with the background noise (preferably 1 - 2 dB more, but that is a matter of 'taste') .
But I reckon that is part of the 'fine tuning' of all parameters. At least I experienced no surprises : -) Thanks for the pro-active information!