Hi Julian, I don't remember the reason(...) but i work in USB mode. I will try to work in DATA A mode this week-end and at the same time, recover the reason for the USB mode choice! (i read that somewhere!)
For the ALC, i set the level just before the end of "variation" (if i'm correct, as i'm not in my shack, it should be 4 steady bars and the 5th flashing?) ele Thank you for the info. 73 QRO de Rudolf, HB9ARI Julian, G4ILO wrote: > > hb9ari wrote: > >> Hi Trev, >> >> Since the beginning, i always get the same behavior >> with my K3 #1212 (factory build). I work >> essentially with JT65A mode; as this mode >> is a single tone mode, i've set the modulation >> level just before full ALC and power to 50W >> (for DX only...). At the beginning of a >> JT65A transmit sequence, the power start >> at ~ 25W and go up to ~ 48W in 3 to 5 sec. >> If the PA temperature is at ~ 40 to 46°C, >> the power variation is lower and power >> output start at ~40W; i'm certainly >> wrong, but i've always thought that this >> was related to PA temp and, as i never get >> an output power higher then selected, >> this was not a problem in my case. >> >> What is a problem for me is the transmit >> audio response; i've tried to adjust XTAL filter >> without success; TX EQU compensation >> too. As my VFO working frequency >> is always set to the JT65A "preferred" >> frequency, it's the audio frequency who >> defines the actual output spectrum; >> for some audio values, i get well over 3dB >> output power variations between some >> JT65A instantaneous frequencies; for example, >> with a 45W max power, for somes frequencies, >> level go under 20W; i work with this since more >> then one year and i'm always hoping that >> the AGC of my correspondent can handle >> a "little" ~3dB RF input variation (the QSB >> is generally higher...) >> >> Sorry for this time and bandwidth consuming >> message. >> >> 73 QRO de Rudolf, hb9ari >> >> >> > > Are you not using DATA A for this, Rudolph? If so, you can set the audio > drive for a steady 4 bars in the "ALC" scale and the K3 will adjust the > power for the value selected across the whole range of the audio spectrum > (that you might reasonably want to use.) > > It didn't always work like this, but it has for many months now. Using PSK31 > I can click on a signal anywhere from about 300Hz to 2700Hz, call them and > get exactly the power requested (within reason, of course.) > > ----- > Julian, G4ILO. K2 #392 K3 #222. > * G4ILO's Shack - http://www.g4ilo.com > * KComm - http://www.g4ilo.com/kcomm.html > * KTune - http://www.g4ilo.com/ktune.html > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
