Hi Larry: Thanks for your message and suggestions. I changed out the PS with another SEC 22 A version, and the symptoms persist. Please keep in mind that the symptoms also persist when running only 5W. I do appreciate the input as to the fact that a heavier PS is required than the typical 20 or 22A capacity version.
Brian K7RE Larry Loen wrote: > Brian Kassel wrote: > >> Hi Jim: >> >> Thanks for the note. Let's see if I can describe to you what I >> see. After even a short transmission of, say, 5 seconds, running >> something like 5W, the frequency of the received PSK-31 signal slowly >> moves to the left on the waterfall display of my MixW program >> traveling about the width of a typical PSK-31 signal in about 2-3 >> seconds. There seems to be no greater frequency shift running 50W >> for periods up to 1 minute duration. I am not sure if my TX >> frequency is varying. I can't tell by ear at this point on another >> receiver. I have a frequency counter, and can measure the TX >> frequency on CW if that will provide any insight. The PS should have >> no voltage sag at this low power level. I use it for other >> projects. It is a commercial switching supply SEC 1223. Since I >> didn't really suspect the PS, I haven't as yet done any measurements. >> on it. I certainly appreciate any assistance you can provide. >> >> Brian K7RE >> Jim Lux wrote: >> >> > > As far as I can tell (and, sample of one notwithstanding, I think I > have a lot of hours with the rig) this is a new symptom. > > I have had various problems, but never a shift in frequency between > transmit and receive whether the rig was on for hours or just turned > on, at least not so far as I could ever tell. > > Do check the power supply, though. And, check the rating. A peak > rating is worthless. You need about a Astron 35 amp supply or better > to run this thing. I ran an Astron 20 (simple math said it worked, > but 20 was a peak rating) and it wasn't enough. But, it also wasn't > easy to detect. In my case, it fooled me by acting like QSK when it > was really just intermittently cutting out. > > > > Larry WO0Z > > > > > _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
