Hi Folks,
Well... aren't I the last person in the flexshpere to discover that
dropping filter to 100hz and lowering AGC-T to 95 or below does wonders
to dig out weak CW sigs.
That should be in the manual!
Cheers
Dave.
___
FlexRadio Systems
Hi All,
There have been discussions over the years about AGC in good
old analog recevers as compared to AGC in modern receivers that
use DSP for the final filters and the AGC.
It is not obvious what kind of testing one should perform to find
out whether an AGC design is good or not so good. I
In fact it tracks, I hope it's intended to do so.
73 de Ignacio, EB4APL
El 17/12/2010 23:12, Steven L Hess wrote:
Is the AGC-T setting supposed to track with the bandstack info?
Steven
___
FlexRadio Systems Mailing List
FlexRadio@flex-radio.biz
On Fri, Dec 17, 2010 at 2:24 PM, EB4APL eb4...@cembreros.jazztel.es wrote:
In fact it tracks, I hope it's intended to do so.
Yes.
AGC-T is set for the current band conditions and I know that at my
QTH, conditions on any particular band seem to be moderately
consistent but vary substantially
] On Behalf Of Mark Lunday
Sent: Saturday, July 10, 2010 11:56 PM
To: 'Gerald Youngblood'
Cc: flexradio@flex-radio.biz
Subject: Re: [Flexradio] AGC pumping?
Thanks Gerald et al. Turning off the NB did the trick.
So..because the NB operates over the entire bandwidth..I don't fully
understand why
To: 'Gerald Youngblood'
Cc: flexradio@flex-radio.biz
Subject: Re: [Flexradio] AGC pumping?
Thanks Gerald et al. Turning off the NB did the trick.
So..because the NB operates over the entire bandwidth..I don't fully
understand why that would make the noise floor jump due to strong adjacent
signals
It is logged in the developer's bug tracker as DE 82
-Tim
---
W4TME
FlexRadio Systems Internet Systems Admin.
Tune in Excitement
On 7/11/2010 8:12 AM, Kevin Hobbs wrote:
I believe this problem is well known as it was discussed with Bob at the
Flex Dinner in Dayton ... I am pretty sure that I
SDR 1.18.5 (have not had time to upgrade yet), F3K.
IARU HF championship. I notice that with a lot of strong signals, it seems
to be overwhelming the AGC. I have the preamp off, ACG settings don't seem
to matter and neither does the AGC-T setting. The symptom is that the
background noise seems
Mark,
AGC operates only on the final filtered bandwidth so pumping from other
signals does not make sense. Do you have the noise blanker turned on? That
might do it since it operates on the entire bandwidth.
Gerald
Gerald Youngblood, K5SDR
President and CEO
FlexRadio Systems(TM)
13091 Pond
FM06be
wd4...@arrl.net
http://wd4elg.blogspot.com
http://wd4elg.net
From: Gerald Youngblood [mailto:ger...@flex-radio.com]
Sent: Saturday, July 10, 2010 7:39 PM
To: Mark Lunday
Cc: flexradio@flex-radio.biz
Subject: Re: [Flexradio] AGC pumping?
Mark,
AGC operates only on the final
[mailto:flexradio-boun...@flex-radio.biz] On Behalf Of Drax Felton
Sent: Sunday, March 28, 2010 6:36 AM
To: 'Dudley Hurry'
Cc: flexradio@flex-radio.biz
Subject: [Flexradio] AGC and Digital Modes
I thought he was referring to HDR calibration. No, I'm not going anyplace
near the Flex calibration
Thanks to everyone who responded to my question.
I did the experiments with the dummy load, etc - that was really interesting
and fun. It totally made the whole thing clear in my mind - I guess I learn
best by seeing things.
The community here sure is great - what a great bunch of helpful
Hi All,
someone from you did testing your receiver to two tone In Band IMD, as
testing ARRL Lab. in extended report?
You may take a look result of the small home testing:
http://forum.cqham.ru/download.php?id=34163
This was checked for SDR-1000, and I do not know what will be a result
for
Hi Dale,
Sorry to take so long getting back..
I also like the AGC-T very much. Here's the problem as I see it.
Most modern radios implement AGC as an active feedback control system
which maintains signal level at the set point the op picks by juggling AF
and RF gain. The operative words are
, May 11, 2008 1:57 PM
To: [EMAIL PROTECTED]; flexradio@flex-radio.biz
Subject: Re: [Flexradio] AGC
Hi Dale,
Sorry to take so long getting back..
I also like the AGC-T very much. Here's the problem as I see it.
Most modern radios implement AGC as an active feedback control system
which maintains
Hi Rob,
I made some dynamic range measurements at two AGC-T settings, with the
intent of determining to what degree the audio gain compression changes
as a function of AGC-T. I used the Elecraft XG2 signal generator which
enables switching between 1 uV and 50 uV (~34 dB)
With AGC-T = 95:
50
PROTECTED]
To: [EMAIL PROTECTED]; flexradio@flex-radio.biz
Sent: Sunday, May 11, 2008 1:56 PM
Subject: Re: [Flexradio] AGC
Hi Dale,
Sorry to take so long getting back..
I also like the AGC-T very much. Here's the problem as I see it.
Most modern radios implement AGC as an active feedback
for years
to be quite.
If you get blasted with these settings on SSB, you have a problem somewhere.
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Robert Dennison
Sent: Sunday, May 04, 2008 11:53 PM
To: flexradio@flex-radio.biz
Subject: [Flexradio] AGC
: [Flexradio] AGC
Rob,
One of the great things about PowerSDR is that you can so easily adjust
the AGC threshold to accomodate band conditions. Remember though, the
lower the AGC-T setting number, the less the AGC will be compressing the
audio gain, therefore, the greater the audible difference
Sheesh,
Just got my ears blasted out by a S9++ sig. Was listening to a QSO one
side was about an S5 he was answered by a guy with an S9++ sig mebbe
-70dbm--. I mean it hurt! Now I thought one of the ideas of AGC was to
keep that from happening! Am I wrong?? I as far as I could tell the AGC
Hi all,
First I want to say that my SDR1K linked to N1MM only by vCOM performed
flawlessly in CQWWCW. Never let me down at all. In fact, I stopped in
the middle of the contest to put up an antenna more worthy of the SDR...
Still a long ways to go...
Two issues came up in my mind. Band
I would like to query the digital mode users regarding the AGC setting.
I'm currently running PowerSDR 1.9.1 beta (original SVN), DXLabs
Commander interfaced via VComm to a test version of Multipsk using VAC
4.07. I
currently have the AGC set to MED, and I notice that when a strong PSK
signal
Jon,
If the signal is in your passband (which I presume it is, since you
see it in the interface) then you can either use the application's
audio filters to limit the width of the passband or narrow down SDR's
passband to eliminate the offending signal from the display of the
radio's
I guess that I narrow the SDR bandwidth to match the bandwidth of the
signal that I am trying to copy... Therefore only the desired signal has
change to grab the AGC.
Works great for narrow band digital signals but less well when there is
a CW carrier inside the SSB pasband.
AL, K0VM
.
Van: [EMAIL PROTECTED] namens Tim Ellison
Verzonden: zo 20-5-2007 5:26
Aan: Lee A Crocker; Flexradio
Onderwerp: Re: [Flexradio] AGC and Constant Volume???
Lee,
For a point of reference, what RF gain value did you end up with using
the method listed below?
-Tim
with it on for example 10
Lee
- Original Message
From: Tim Ellison [EMAIL PROTECTED]
To: Lee A Crocker [EMAIL PROTECTED]; Flexradio FlexRadio@flex-radio.biz
Sent: Saturday, May 19, 2007 11:26:13 PM
Subject: RE: [Flexradio] AGC and Constant Volume???
Lee,
For a point of reference, what RF gain value
-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Lee A Crocker
Sent: Sunday, May 20, 2007 3:42 AM
To: Tim Ellison; Flexradio
Subject: Re: [Flexradio] AGC and Constant Volume???
Peter has it correct, it varies according to band and time of day, and it is
set up by ear. Mine usually
and played them back, I occasionally get comments on how quite
the band must be at my QTH ;)
Mike
W5CUL
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Lee A Crocker
Sent: Sunday, May 20, 2007 5:42 AM
To: Tim Ellison; Flexradio
Subject: Re: [Flexradio] AGC
A Crocker'; Tim Ellison; 'Flexradio'
Subject: RE: [Flexradio] AGC and Constant Volume???
Hi guys,
I think I found part and maybe most of the reason for my AGC issues. I
finally dug out my XG1 signal generator and did the level calibration.
It seems to affect more than just the S-meter levels
When I set up my radio I would never use the RF gain as a volume control. I
set the RF gain so that the band noise is just audible on any goven band, and I
have no trouble with the AGC. In my rig I have the SDR feeding an outboard 3
channel stereo mixer so I can listen to several radios at
A Crocker
Verzonden: za 19-5-2007 14:50
Aan: Flexradio
Onderwerp: Re: [Flexradio] AGC and Constant Volume???
When I set up my radio I would never use the RF gain as a volume control. I
set the RF gain so that the band noise is just audible on any goven band, and I
have no trouble with the AGC
Lee,
For a point of reference, what RF gain value did you end up with using
the method listed below?
-Tim
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Lee A Crocker
Sent: Saturday, May 19, 2007 8:51 AM
To: Flexradio
Subject: Re: [Flexradio] AGC
I have really been playing with a lot of settings on my SDR-1000 since
getting it back from service repairs over a week ago. One thing that eludes
me is getting a constant volume output with varying signal levels. The
symptoms I experience is the rx audio going into distortion when the signal
What version of PowerSDR are you using?
-Tim
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Steve Kallal
Sent: Friday, May 18, 2007 10:28 PM
To: 'Flex-radio Reflector'
Subject: [Flexradio] AGC and Constant Volume???
I have really been playing
: [Flexradio] AGC and Constant Volume???
What version of PowerSDR are you using?
-Tim
___
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
I followed the setup in the knowledgebase today and set up my SDR according to
this article. http://kb.flex-radio.com/article.aspx?id=10323cNode=2J5R0E
When I set my SDR to
II. Audio Tab In PowerSDRTM
1. Software: Buffer = 1024
The audi pops in and out totally breaking up. My CPU on the
:[EMAIL PROTECTED]
radio.biz] On Behalf Of KQ8RP
Sent: Saturday, April 14, 2007 4:36 PM
To: [EMAIL PROTECTED]
Subject: [Flexradio] AGC and Other Optimized Receiver Settings
I followed the setup in the knowledgebase today and set up my SDR
according to this article. http://kb.flex-
radio.com
D44 Card set up 96K/2048
- Original Message -
From: FlexRadio - Eric [EMAIL PROTECTED]
To: 'KQ8RP' [EMAIL PROTECTED]; [EMAIL PROTECTED]
Sent: Saturday, April 14, 2007 5:40 PM
Subject: RE: [Flexradio] AGC and Other Optimized Receiver Settings
What soundcard are you using? It is likely
/Duo and 2gig ram.
AGC set to MED and RF set to 77. Preamp set to High (Mediocre antenna).
WA4CM
- Original Message -
From: FlexRadio - Eric [EMAIL PROTECTED]
To: 'KQ8RP' [EMAIL PROTECTED]; [EMAIL PROTECTED]
Sent: Saturday, April 14, 2007 5:40 PM
Subject: RE: [Flexradio] AGC
: [Flexradio] AGC and Other Optimized Receiver Settings
D44 Card set up 96K/2048
- Original Message -
From: FlexRadio - Eric [EMAIL PROTECTED]
To: 'KQ8RP' [EMAIL PROTECTED]; [EMAIL PROTECTED]
Sent: Saturday, April 14, 2007 5:40 PM
Subject: RE: [Flexradio] AGC and Other Optimized Receiver
I don´t see any difference whichever figure I enter in the AGC slope, 0
to 10 dB. My SDR 1000 shows constant audio output with RF input levels
going down to -75 dBm, then it decreases according to the input level.
This is not affected by the Slope setting.
If this is normal, what this entry
Ken N9VV wrote:
On the front panel, select AGC CUSTOM and try again. The AGC system is
explained in the new 1.8.0 Users Manual on pages 95-96
Slope (dB): Slope changes the rate at which gain increases with
decreased signal. If you have the Slope set to 10 dB and the signal
gets weaker by
Under AGC...the Attack, Decay and Hang are greyed out on mine...how can
I gain access (ie adjust the AGC)
also what is a definition of the slope
thanks
steve
kw5tx
___
FlexRadio mailing list
FlexRadio@flex-radio.biz
Hi Steve,
On the front Console panel select CUSTOM and that will un-grey the
options on SETUP -- DSP -- AGC settings.
--
AGC (PDF page 95-96 of the 1.8.0 manual)
The settings control the AGC Custom setting on the front panel.
Slope (dB): Slope
Can anyone suggest some good Custom AGC settings. I'd like the loud stations to
be reduced and the weak stations to be quickly made louder. I'm not pleased
with mine which are:
Slope=4, Max Gain=80, Attack=7, Decay=18, Hang=30, Hang Threshold=middle of
bar.
-- next part
. Should
be a highly recommended read (required) for all Flexers.
-K6KDK
- Original Message -
From: Gerald Capodieci [EMAIL PROTECTED]
To: flexradio@flex-radio.biz; [EMAIL PROTECTED]
Sent: Sunday, December 17, 2006 3:34 PM
Subject: [Flexradio] AGC and Other Optomized Receiver Settings
:[EMAIL PROTECTED] On Behalf Of Chuck Mayfield
Sent: Monday, December 18, 2006 10:16 AM
To: [EMAIL PROTECTED]
Subject: Re: [Flexradio] AGC and Other Optomized Receiver Settings
I tried searching the TT site using various combinations of the
(un-specific) cite you made.
For us other dummies, would
Here is an article by Sinisa YT1NT which describes how
the Orion AGC works and how to set it up. The Orion
is close to the SDR in the way the RX works. The
Orion uses a single conversion RX through a roofing
filter before demodulation to 11 khz and then sending
that signal to a DSP unit.
The
I. M-Audio Software Changes
1. DMA buffer to 1024
2. Codec Sample Rate: Uncheck the Rate Locked box and the
Reset Rate When Idle box.
3. Variable Signal Levels: Outputs= -10dBv, Ins1= +4, Ins2= +4,
Ins3= -10
In upper left hand corner of the PowerSDR main screen click the
with.
Edwin Marzan
AB2VW
From: [EMAIL PROTECTED] on behalf of Gerald Capodieci
Sent: Sun 12/17/2006 6:34 PM
To: flexradio@flex-radio.biz; [EMAIL PROTECTED]
Subject: [Flexradio] AGC and Other Optomized Receiver Settings
I. M-Audio Software Changes
1. DMA buffer
] On Behalf Of Gerald Capodieci
Sent: Sunday, December 17, 2006 6:34 PM
To: flexradio@flex-radio.biz; [EMAIL PROTECTED]
Subject: [Flexradio] AGC and Other Optomized Receiver Settings
I. M-Audio Software Changes
1. DMA buffer to 1024
2. Codec Sample Rate: Uncheck the Rate Locked box
, December 17, 2006 3:34 PM
Subject: [Flexradio] AGC and Other Optomized Receiver Settings
I. M-Audio Software Changes
1. DMA buffer to 1024
2. Codec Sample Rate: Uncheck the Rate Locked box and the
--etc.etc.etc..
___
FlexRadio
: [Flexradio] agc slope
I am getting an unhandled exception message whe I try and change the slope
setting for the agc. Seems to have started after svn 686. Any help would
be appreciated.
Thanks,
Dave-W4DWG
___
FlexRadio mailing list
FlexRadio@flex
I am getting an unhandled exception message whe I try and change the slope
setting for the agc. Seems to have started after svn 686. Any help would be
appreciated.
Thanks,
Dave-W4DWG
-- next part --
An HTML attachment was scrubbed...
URL:
8:35 PM
To: FlexRadio@flex-radio.biz
Subject: [Flexradio] agc slope
I am getting an unhandled exception message whe I try and change the
slope setting for the agc. Seems to have started after svn 686. Any
help would be appreciated.
Thanks,
Dave-W4DWG
-- next part
You need to set the gain for CW. On the DSP setup tab, if you have
Block LMS checked, dial down the gain to single digits.
Bob
N4HY
[EMAIL PROTECTED] wrote:
Tnx Eric and Gerald for your prompt response.
Running SVN 652 (problem is not there when I go back to 1.6.2.).
Dialed in
:[EMAIL PROTECTED]
radio.biz] On Behalf Of [EMAIL PROTECTED]
Sent: Tuesday, August 22, 2006 5:40 PM
To: FlexRadio@flex-radio.biz
Subject: [Flexradio] AGC
Tnx Eric and Gerald for your prompt response.
Running SVN 652 (problem is not there when I go back to 1.6.2.).
Dialed in Gerald's settings
:[EMAIL PROTECTED]
radio.biz] On Behalf Of [EMAIL PROTECTED]
Sent: Tuesday, August 22, 2006 4:46 PM
To: FlexRadio@flex-radio.biz
Subject: [Flexradio] AGC
Have I done something wrong. Now my AGC seems to have no effect on CW.
The signals increase and decrease in volume in relationship
Tnx Eric and Gerald for your prompt response.
Running SVN 652 (problem is not there when I go back to 1.6.2.).
Dialed in Gerald's settings on custom AGC and still the same.
Seems as if no AGC action taking place.
While at it ... my NR on CW makes it almost uncopiable ... but thought I read
PROTECTED]
Cc: flexRadio@flex-radio.biz
Sent: Thursday, December 08, 2005 9:51 PM
Subject: Re: [Flexradio] AGC an gain since V.1.4.5. prev 1
Martin and all:
The new agc is 3/4 implemented. The fast attack portion is just a
dummy calculation while I figure out why I cannot do what Phil says he
Since Power SDR V1.4.5 prev. 1 I don't get full gain when in receive-mode
even when I set the max-gain setting to 100dB. When no antenna is connected
there should be no '''AGC-Voltage''' so the receiver should work with full
gain. The audible noise floor should be the same when fixed-gain and agc
A Suggestion for improving the usefulness of the SDR-1000's AGC system
I wonder how many other SDR users are bothered by the way the Signal
Strength meter operates. For example, the S-meter does not reflect the rate
of agc decay or agc hang time as it should. If the AGC delay or AGC Hang
]
radio.biz] On Behalf Of Eric Wachsmann - FlexRadio
Sent: Monday, November 07, 2005 2:38 PM
To: 'Alan Davis'; FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] AGC suggestion
Alan,
I agree that we need to have some sort of RF Gain control on the front
panel. It remains to be seen whether
SDR1000 AGC
During my time as a ham I have spend a lot of time working on AGC systems. I
tend to be rather passionate about the subject since in my opinion the AGC
system can either make or break a receiver.
Over the past 12 months I've experimented with different controls and
algorithms in
I used Phil's AGC code in the VB radio and found it very smooth and restful
to listen to, especially over a period of hours. I was able to switch back
and forth for comparison with the standard system and Phil's was definitely
a winner.
I also used a two detector system back in the 70's, when
Phil,
thank you very much for the AGC paper. That is exactly what I would like
to see integrated in the PowerSDR software. As Bob G4BBY already wrote,
the characteristic also reminds me of the Plessey SL621.
73 Bodo DJ9CS
I want to thank Phil for his fantastic analysis. The dual detector was
what my mind was missing. It is the right question and the right
solution.His block diagram is perfect. I have asked him for his VB
code and will look to implement this.
Bob
Title: Message
I also am having
trouble getting to the linked pdf document
Pete,
N3EVL
Peter J. ThompsonPrincipal Software EngineerAuthentica,
Inc.781 487 2600 X 260Fax 781 290
0424[EMAIL PROTECTED]Authentica is the leading provider
of Enterprise Rights Management (ERM) solutions.Our ERM
-
From:
[EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Pete Thompson
Sent: Thursday, August 11, 2005
12:34 PM
To: FlexRadio@flex-radio.biz
Subject: [Flexradio] AGC Document?
I also am having trouble getting to
the linked pdf document
Pete, N3EVL
Peter J
: Thursday, August 11, 2005
1:41 PM
To: 'Pete Thompson';
FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] AGC
Document?
I sent the pdf to the two folks that were
having trouble downloading. If people are still having trouble viewing
the document, we could probably talk Eric Ellison into hosting
70 matches
Mail list logo
