During my activation of EA2/NV-092 yesterday afternoon, I managed to ask for modulation reports and got comparative reports from 3 stations in EA of my transmission with and without the Speech Processor (SP).
The reports were given while I was transmitting on 40m band LSB with 5 W into an inverted vee endfed wire about 21.5 m long with its appex about 7m high. Since the antenna was endfed and there was a very short length of coax (less than 1m) from the 9:1 unun to the FT-817ND, I was speaking really close to the antenna wire,so the distance from the Speech Processor unit and the hand mike to the antenna wire was about 1m or possibly less.
Nobody reported RFI problems either with or without the SP connected. However, 3 different chasers told me they were copying me better with the SP OFF
One of these 3 chasers said that not only the quality of my audio was better without the SP, but also the signal on the S-meter was stronger without SP
A second chaser, right after this first, subscribed what the first one had said and finally a third chaser said he could copy me nothing with the SP ON and perfectly OK with the SP OFF.
The pile up was huge and the temperature too low to spend more time asking for reports and doing other tests, so I just left the SP OFF and kept working the pileup.
I have checked the SSB MIC gain in my FT-817ND (menu #46) and it’s 90. Is this too much? I don’t know. I think that’s something I’ve never changed since I bought 2nd hand the rig back in 2009 or so…
The 2 tunable trimmers inside the SP box are like this. Again, I’ve never changed them:
These reports were really a surprise because it’s just the contrary of what Jorge EA2LU told me when we made our first test in a local QSO on 10m SSB a few days ago.
We’ll have to investigate this further and run some more tests.
Problem is that being in a summit in winter is not the most attractive test lab I can think of…