I also noticed this, but on 40m and I think on 20m. No 80m antenna this weekend. Would not have connected it with the K3 but for your note.
Rich NU6T On 11/8/2010 5:34 AM, Luis V. Romero wrote: > All: > > In SS this weekend, I noticed something "new" with my K3: > > When attempting to transmit a low power tune signal (I'm set for 10 watts > out on tune) below, say 3.520, the power out and swr meters begin to > oscillate wildly. Going above 3.520, everything looks and works normally. > > If I key the transmitter using the TUNE function (press and hold XMIT), then > sweep the VFO below 3.520, the rig transmits fine at any power level but > does not receive (see below) until I move the vfo, whereupon it starts the > oscillation again. > > Listening on the receiver, when I tune below 3.517.70, the receiver stops > hearing anything on the band and what sounds like distorted voice audio from > a local Broadcaster is heard. I have a 50kw AM Broadcaster 5 miles away on > 970kHz, BTW, its their audio that I'm hearing. Its completely > unintelligible, but I can correlate that it's the same audio when they stop > modulation or go to commercials. Immediately when passing 3.517.70 going up > in the band, the receiver returns to normal amateur band reception, and the > distorted audio goes completely away. I have made a recording in case > Elecraft wants to hear what this sounds like. > > Tested this on SSB and CW, and find that the change to distorted voice audio > happens at 3.517.70 on cw, 3.519.30 on LSB and 3.516.30 on USB. This switch > point appears consistent, as I have repeated it several times. I don't have > the NB or NR on, and turning these on don't change the result. > > This is with K3 # 3192 using the recalled beta firmware version 4.18. I > have not noted this issue before, but to be honest, I don't often use the > low end of 80m in the course of my normal operation. I came upon this while > looking for stations in SS CW this past weekend. > > Anybody else seen this behavior? > > I don't know if this has anything to do with the issues experienced with > 4.18, but I thought I would report it to make sure all the information is > out there. > > I too have found that the transmit audio parameters that I normally used > with 4.14 now sound a bit distorted with 4.18. I ALWAYS install EVERYTHING > ( check all the boxes) on a firmware update, not just the portions that have > changed, as suggested by Eric in his previous email. I have a direct RS232 > connection from a "real" com port on my computer, through a data switch > between my MicroKeyer II and said com port that I use to delegate what > serial connection sees the radio's com port. > > I will be backrevving to 4.14 tonight, but kept 4.18 installed for SS CW. > The new APF, although rather ringy, was extremely useful in grabbing 15m ESP > QRP signals during SS CW. > > I think it's a great first effort by Lyle. I'm sure further tweaking will > ensue and as everything in the K3, it will just keep getting better. > > -lu-w4lt- > K3 # 3192 > > ______________________________________________________________ > 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 > > ______________________________________________________________ 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
