Re: [Flexradio] PowerSDR 1.18.1 AGC-T lag
It's not a problem. It is just the AGC itself. AGC changes in AGC-T are just following the AGC rate. Carl Moreschi N4PY 121 Little Bell Drive Bell Mountain Hays, NC 28635 - Original Message - From: "Jack Haverty" To: "Bob McGwier" Cc: Sent: Monday, June 22, 2009 5:55 PM Subject: Re: [Flexradio] PowerSDR 1.18.1 AGC-T lag Bob, I think you're on to something. With AGC at slow, medium, or long, there is a noticeable lag. It may be different length of time within those three, my ears aren't calibrated enough to say for sure. With AGC at fast or fixed, there is no perceptible (to me) lag. In all cases, any lag occurs only when sliding the cursor from left-to-right. There is no lag going right-to-left in any setting. Someone emailed me to say that the same behavior also happens with his quad-core machine, so I conclude it's not my CPU. I'm not sure that this is a problem or is the intended behavior. It's most noticeable when you've had the AGC set for strong signals, and slide it right to bring up a weak one. Can blow your ears off if you're not careful... I'm used to it now so I just move the cursor slowly and let it catch up. I usually use the medium setting. 73, /Jack On Mon, 2009-06-22 at 16:38 -0400, Bob McGwier wrote: What is your AGC setting , SLOW or LONG? Try medium. Bob N4HY Jack Haverty wrote: > I've loaded PSDR 1.18.1 and it seems to work fine - Flex-3000, 3GHz > single-core PC, sampling 96KHz 512 buffers. NR in particular seems to > be much more effective even though I thought 1.18.0 was good. > > One change I've noticed between 1.18.1 and 1.18.0 is that the AGC-T > behavior seems to lag when you move the control slider - i.e., there is > a fraction of a second lag until the audio output changes. This is on > USB, 20m, with only NR and SR active. > > If I have a certain level of background noise in the speaker, then drag > the AGC-T to the right, the noise stays the same and then increases > maybe a 1/4 second later. With 1.18.0 it used to be essentially > instantaneous. > > Anybody else observe this behavior? It's not really a problem, but I'm > wondering if it's an indication that my CPU isn't fast enough. The > Computer-% reading doesn't change much as I do this, hovering in the > 25% > range all the time. > > Jack K3FIV > > ___ 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.flex-radio.com/ Homepage: http://www.flex-radio.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.flex-radio.com/ Homepage: http://www.flex-radio.com/
Re: [Flexradio] PowerSDR 1.18.1 AGC-T lag
Bob, I think you're on to something. With AGC at slow, medium, or long, there is a noticeable lag. It may be different length of time within those three, my ears aren't calibrated enough to say for sure. With AGC at fast or fixed, there is no perceptible (to me) lag. In all cases, any lag occurs only when sliding the cursor from left-to-right. There is no lag going right-to-left in any setting. Someone emailed me to say that the same behavior also happens with his quad-core machine, so I conclude it's not my CPU. I'm not sure that this is a problem or is the intended behavior. It's most noticeable when you've had the AGC set for strong signals, and slide it right to bring up a weak one. Can blow your ears off if you're not careful... I'm used to it now so I just move the cursor slowly and let it catch up. I usually use the medium setting. 73, /Jack On Mon, 2009-06-22 at 16:38 -0400, Bob McGwier wrote: > What is your AGC setting , SLOW or LONG? > > Try medium. > > Bob > N4HY > > > Jack Haverty wrote: > > I've loaded PSDR 1.18.1 and it seems to work fine - Flex-3000, 3GHz > > single-core PC, sampling 96KHz 512 buffers. NR in particular seems to > > be much more effective even though I thought 1.18.0 was good. > > > > One change I've noticed between 1.18.1 and 1.18.0 is that the AGC-T > > behavior seems to lag when you move the control slider - i.e., there is > > a fraction of a second lag until the audio output changes. This is on > > USB, 20m, with only NR and SR active. > > > > If I have a certain level of background noise in the speaker, then drag > > the AGC-T to the right, the noise stays the same and then increases > > maybe a 1/4 second later. With 1.18.0 it used to be essentially > > instantaneous. > > > > Anybody else observe this behavior? It's not really a problem, but I'm > > wondering if it's an indication that my CPU isn't fast enough. The > > Computer-% reading doesn't change much as I do this, hovering in the 25% > > range all the time. > > > > Jack K3FIV > > > > > ___ 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.flex-radio.com/ Homepage: http://www.flex-radio.com/
Re: [Flexradio] PowerSDR 1.18.1 AGC-T lag
What is your AGC setting , SLOW or LONG? Try medium. Bob N4HY Jack Haverty wrote: I've loaded PSDR 1.18.1 and it seems to work fine - Flex-3000, 3GHz single-core PC, sampling 96KHz 512 buffers. NR in particular seems to be much more effective even though I thought 1.18.0 was good. One change I've noticed between 1.18.1 and 1.18.0 is that the AGC-T behavior seems to lag when you move the control slider - i.e., there is a fraction of a second lag until the audio output changes. This is on USB, 20m, with only NR and SR active. If I have a certain level of background noise in the speaker, then drag the AGC-T to the right, the noise stays the same and then increases maybe a 1/4 second later. With 1.18.0 it used to be essentially instantaneous. Anybody else observe this behavior? It's not really a problem, but I'm wondering if it's an indication that my CPU isn't fast enough. The Computer-% reading doesn't change much as I do this, hovering in the 25% range all the time. Jack K3FIV -- (Co)Author: DttSP, Quiktrak, PowerSDR, GnuRadio Member: ARRL, AMSAT, AMSAT-DL, TAPR, Packrats, NJQRP, QRP ARCI, QCWA, FRC. "You don't need to see the whole staircase, just take the first step.", MLK. Twitter:rwmcgwier Active: Facebook,Myspace,LinkedIn ___ 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.flex-radio.com/ Homepage: http://www.flex-radio.com/
[Flexradio] PowerSDR 1.18.1 AGC-T lag
I've loaded PSDR 1.18.1 and it seems to work fine - Flex-3000, 3GHz single-core PC, sampling 96KHz 512 buffers. NR in particular seems to be much more effective even though I thought 1.18.0 was good. One change I've noticed between 1.18.1 and 1.18.0 is that the AGC-T behavior seems to lag when you move the control slider - i.e., there is a fraction of a second lag until the audio output changes. This is on USB, 20m, with only NR and SR active. If I have a certain level of background noise in the speaker, then drag the AGC-T to the right, the noise stays the same and then increases maybe a 1/4 second later. With 1.18.0 it used to be essentially instantaneous. Anybody else observe this behavior? It's not really a problem, but I'm wondering if it's an indication that my CPU isn't fast enough. The Computer-% reading doesn't change much as I do this, hovering in the 25% range all the time. Jack K3FIV ___ 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.flex-radio.com/ Homepage: http://www.flex-radio.com/
