Gary, We have done quite a bit of testing over the last few days and have found several interesting things.
1. Use the Leveler. You can get to it by going to Setup Form -> DSP -> AGC/ALC. Enable it at the 10dB setting. This will help your average power. 2. Try using the Compander at levels around 3. This combined with the leveler really helped us attain higher average power (with peaks up to 130W). Please try this and let us know what you find. Eric Wachsmann FlexRadio Systems > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > Sent: Sunday, February 12, 2006 11:07 AM > To: [EMAIL PROTECTED] > Cc: Eric Wachsmann - FlexRadio; FlexRadio@flex-radio.biz > Subject: RE: [Flexradio] PowerSDR Beta Preview 13 has been Released. > > Eric: I understand all that. Here's the result of an actual experiment I > did this morning. I admit it is just one sample. Take the result > accordingly. > > I tried 5 successive times to break through to CT3MD on Porto Santo Island > on 20 meters with Preview 14. The external wattmeter showed no more than > 45 watts "peak". I switched to Preview 12 and set all the controls to be > the same, then tried again. I broke through the pileup on the first try > with a "59" report. The external wattmeter showed 100 watts "peak". > > I gather that you are saying I am overdriving my PA in the latter case, > but not in the former. Other than that, you imply that I may be > splattering as well. The report didn't indicate that. > > Comments? > Gary > -------------- Original message ---------------------- > From: "Eric Wachsmann - FlexRadio" <[EMAIL PROTECTED]> > > Gary, > > > > After I got this message, I went back and took my measurements again > > using a scope. I am seeing peak power up to ~140W with the AVG power > > around 45W depending on voice characteristics. This is what we were > > targeting with the new ALC. > > > > Why should you be happy with this? Because it is an extremely linear > > ALC that allows you to over drive the heck out of the input without > > having to worry about damaging your transmitter, and without splattering > > all over the band. > > > > > > Eric Wachsmann > > FlexRadio Systems > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > > > Sent: Thursday, February 09, 2006 5:17 PM > > > To: [EMAIL PROTECTED] > > > Cc: FlexRadio@flex-radio.biz > > > Subject: Re: [Flexradio] PowerSDR Beta Preview 13 has been Released. > > > > > > I read the release notes and, yes, I experience exactly what was > > > described: > > > > > > // Note that because the ALC was non-functional > > > // in the last series of releases (since 1.4.5 started), > > > // the output power for inputs which are being overdriven > > > // will be attenuated. As a reminder, on SSB, you will > > > // not get 100W on a bird wattmeter. Something closer to > > > // 30 or 40W is a more reasonable expectation for average > > > // power for most voices/microphones. > > > > > > Now, would someone please explain to me why I still see 100+ watts on > > the > > > peak power meter of the SDR while the external wattmeter peak power > > reads > > > about half that? Also, please tell me why I should be happy with half > > the > > > power I used to put out. I assume the answer will be something like > > "you > > > were overdriving and distorted before, now you are not". The signal > > > reports I got were nothing like that, I might add. > > > > > > Sorry to pose questions which may be obvious to most, but I really > > would > > > like to know. > > > > > > Gary > > >
