I believe you mentioned the same, or similar problem, on AMfone.net, back around January/February 2010, when you still had the 5000 and were running version 1.16 or 1.18.
Pete, wa2cwa http://www.manualman.com On Wed, 14 Dec 2011 22:47:57 -0500 "Brett Gazdzinski" <brett.gazdzin...@verizon.net> writes: > I think that is it. > I was listening to guys with very strong signals running class E > rigs and it > was very noticeable, yet on the homebrew receiver they sound fine. > It was only under modulation, and I think they push the positive > modulation > quite high. > > What as the problem with early versions of psdr and the agc working > off the > audio? > I don't remember having any problems with AM reception on the old > version. > > Brett > N2DTS > ----- Original Message ----- > From: <manual...@juno.com> > To: <flexradio@flex-radio.biz> > Sent: Wednesday, December 14, 2011 3:16 PM > Subject: Re: [Flexradio] grunge on rx audio.. > > > > Running here PSDR V 2.2.3 with Flex 5000. The only time I > occasionally > > hear some type of peak distortion or "muddy"-type distortion on 75 > meters > > is when listening to strong AM signals operating "class E" type > rigs. I > > don't hear on it on broadcast AM, commercial SW AM, or amateurs > running > > current transceivers or even most boatanchor rigs. I also don't > hear when > > listening to AM transmissions on 40 or 20 meters. 160 antenna is > down so > > no opinion there. > > > > On 10 meters AM, I generally shun away from being too judgmental > on > > "quality" AM reception, since, besides fading and other > atmospheric > > anomalies, many I've heard and/or worked are not using current > state of > > the art type transceivers, but old drifty boatanchors, converted > CB rigs > > and trashy CB linears, modified commercial rigs, modified > commercial FM > > rigs, or cobbled together old electronic car parts. > > > > Maybe, since DTS, EMS, AEX, and myself all live in the Northeast, > maybe > > the AM reception problem, at least on 75, is more localized. > > > > Pete, wa2cwa > > http://www.manualman.com > > > > > > > > On Wed, 14 Dec 2011 12:48:23 -0500 W1AEX - Rob > <w1aex.f...@cox.net> > > writes: > >> Which version of PSDR are you using Brett? Version 2.2.3 fixed a > very > >> > >> big issue with AM reception (AGC tracking the sideband energy > rather > >> > >> than the carrier energy) that was present in all the previous > 2.x.x > >> > >> versions and the later 1.x.x versions. That being said, I do > notice > >> what > >> sounds like peak distortion on some strong signals when using the > AM > >> > >> mode. I do not hear it when listening with other conventional AM > >> receivers that I use. Adjusting the AGC-T slider in PSDR doesn't > >> seem to > >> stop it, but I wonder if adjusting the variables in the DSP > AGC/ALC > >> > >> setup tab might address it. The "max gain" and "attack" values > might > >> be > >> a good starting point for experimentation. Curiously, I never > hear > >> that > >> distortion with PSDR when listening to strong signals on the AM > >> broadcast band, so it may have something to do with selective > fading > >> and > >> the way PSDR deals with it. > >> > >> As Tim may have been inferring with his question, the "peak > >> distortion" > >> phenomenon is not present on those signals when listening in SAM > >> mode. > >> Unfortunately, some of the older AM transmitters being used are > not > >> > >> perfectly stable and tend to move a few Hz when modulated. The > SAM > >> detector warbles now and then with those stations as it tracks > them > >> on > >> peaks. It's most notable on 10 meter AM where there's a > >> multiplication > >> factor being applied to the VFO in the older transmitters. So, > at > >> this > >> point, I find that I switch back and forth between AM and SAM to > see > >> > >> what seems to work best with different stations I run into. I'd > be > >> curious what others may have noticed when operating AM or when > SW > >> listening in the AM or SAM modes. > >> > >> 73, > >> > >> Rob W1AEX > > > > _______________________________________________ > > FlexRadio Systems Mailing List > > FlexRadio@flex-radio.biz > > > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > > Knowledge Base: http://kc.flexradio.com/ Homepage: > > http://www.flexradio.com/ > > > _______________________________________________ > FlexRadio Systems Mailing List > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > Knowledge Base: http://kc.flexradio.com/ Homepage: > http://www.flexradio.com/ > _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
