I have now repeated the test with my 2 tone external source, and get similar results to the microphone "Wurlo" test. The PEAK signal amplitude is influenced by the Compression (Clipping ?)....
Approaching the anniversary of the product release, it's 'bout time the SSB transmit side of the K3 was sorted out. Brings back memories of the KSB2 saga ! 73 Stewart G3RXQ On Tue, 29 Apr 2008 03:46:46 -0700 (PDT), G4ILO wrote: > > > Stewart G3RXQ wrote: > >> My PEAK power is down by about 50% as measured on an 200MHz >> oscilloscope when the COMP is set to 0. This can't be right.. >> > I don't have your measuring equipment, Stewart, but something doesn't seem > right to me either. > > The power output doesn't seem consistent even when you don't change the > settings. With MIC=60 CMP=0 and PWR=12.0 if I "aaalo" into the mic, my > average reading power meter normally shows about 1W. But sometimes it holds > at 2W or even 3W and sometimes a bit less. I have also observed the meter > steady at say 2W then after about a second drop back to 1W, even though I > haven't changed the pitch or tone of my "aaaa...". I realize this is not a > scientific test, but I don't believe that there is that much difference > between my consecutive repetitions of "aaalo." > > I need CMP=20 to get a reasonable average level on speech. Without any > compression the talk power is too low. Even my FT-817 with 5W pep output can > manage an average of 1W on speech and it doesn't have a speech compressor. > > After doing these tests I connected the antenna again and the power meter on > the MFJ tuner was showing a low reading. I put the PM20 back and sure > enough, the power was low. No control on the radio was changed. I twiddled > the power control down and then back up to 12.0 and full power was restored. > Go figure. > > ----- > Julian, G4ILO K3 s/n: 222 K2 s/n: 392 > G4ILO's Shack: www.g4ilo.com > Zerobeat Ham Forums: www.zerobeat.net/smf _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
