So if I slowly turn down the gain on one of your "pro audio" amplifiers and the
gain slope changes but remains a straight line that's distortion?
On 3/7/2017 4:11 PM, Jim Brown wrote:
...
And I'll repeat my previous observation that a signal path with gain that
varies with time or with the
> AGC adjusts the receiver gain, compared to the audio bits, rather slowly
and DOES NOT change the "dynamic range."
Exactly. AGC changes the receiver's gain between two points in time, not
between two signals arriving at the same time.
I believe changing the AGC settings does improve the "mush"
Wes and Ed,
It's important to realize that in the K3 and later Elecraft rigs, all of
this is happening in the digital domain. One thing we learned about DSP
in pro audio is that dynamics processing burns a LOT processor cycles.
DSP SIMULATES the behavior of analog circuitry, but depending on
AGC adjusts the receiver gain, compared to the audio bits, rather slowly and
DOES NOT change the "dynamic range."
If you're listening to a signal and it's too loud for your ears and you turn the
audio gain down 10 dB, does that change the amplitude ratio of any signal you're
listening to?
: [Elecraft] [K3] AGC White Paper
What I get using a relatively flat AGC is automation of my
riding the RF gain control. I don't see how this kind of
automation affects decoder performance. It should help
performance as the decoder has a nearly constant level signal to
work with. Please explain
-
From: Bill Frantz [mailto:fra...@pwpconsult.com]
Sent: 07 March, 2017 13:05
To: e...@w0yk.com
Cc: elecraft@mailman.qth.net
Subject: RE: [Elecraft] [K3] AGC White Paper
What I get using a relatively flat AGC is automation of my
riding the RF gain control. I don't see how this kind of
automation
What I get using a relatively flat AGC is automation of my
riding the RF gain control. I don't see how this kind of
automation affects decoder performance. It should help
performance as the decoder has a nearly constant level signal to
work with. Please explain.
Thanks - Bill AE6JV
On
...@mailman.qth.net] On Behalf Of Bill
Frantz
Sent: 05 March, 2017 23:17
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] [K3] AGC White Paper
Thanks Al. A very useful paper.
Now to use SLP=15 for digital, where I want the AtoD to not have
to deal with a big range, while using something with more
Brian,
The effect of reducing the RF Gain is *about* the same as increasing the
AGC threshold. Not quite, but that is a simplistic way of looking at it.
73,
Don W3FPR
On 3/6/2017 6:13 PM, Brian Hunt wrote:
I noticed that your AGC curves were made with the RF gain full max. I rarely
Jim,
I am competitive mainly when I go on expeditions and operate from semi
rare countries like 8Q7 or 6V7 or CT3. Finding clear run frequency from
there is not a problem. On the other hand carrying extra box and using
big screen there is a problem. Therefore P3 for me is not justifiable
Is there a way to simulate different agc settings by generating sine wave
CW signals and varying the relevant parameters?
I'd like to write some code to allow for straightforward observation of the
phenomena we are discussing and various assumptions about the input signals
to be tested.
It
I noticed that your AGC curves were made with the RF gain full max. I rarely
operate that way. I usually turn the RF gain down to where the noise peaks are
barely kicking the S-meter. By doing so, is it fair to say I'm moving the curve
to the right? I.e, a higher signal amplitude before the
On 3/6/2017 2:29 PM, Don Wilhelm wrote:
Actually it responds to the integral of all the signals in the
passband, but if there is a single stronger one it will predominate.
In truth, depending on the AGC *attack time constant* the AGC system
responds to the *instantaneous peak voltage* of all
ctor
Subject: [Elecraft] [K3] AGC White Paper
I spent a little bit of time this weekend and put together yet another K3 AGC (YAKA)
"white paper" to put some measurements and discussion of the results down in
the hope that others may benefit. Maybe it'll help folks understand AGC better
I think about it as follows:
THR: The signal level at which AGC action begins. Lower number = lower
signal level where AGC begins.
SLP: Wayne is an EE and I'll bet he views SLP as the degree of gain
compression in the AGC system. Thus, higher SLP values mean a higher
amount of
On Mon,3/6/2017 11:42 AM, Igor Sokolov wrote:
This is really a great idea wich is if ever implemented would make me
finally purchase P3.
Igor,
While it's a nice idea, it may or may not be possible to implement. BUT
-- we're both pretty active contesters, and I wouldn't dream of working
a
On Mon,3/6/2017 11:29 AM, Don Wilhelm wrote:
This is often referred to as "AGC Pumping".
Yes, BUT -- there is distortion associated with AGC action, and that
distortion is what is perceived as "mush."
[Remember that the fundamental definition of distortion is "anything in
the output that's
Eric,
Thank you. This is really a great idea wich is if ever implemented would
make me finally purchase P3.
I am sure Elecraft is listening.
73, Igor UA9CDC
06.03.2017 12:29, Erik Basilier пишет:
Al, your paper looks very helpful for the situation when the concepts need
to be studied. After
Wes is correct. Let me say it in a slightly different way.
The AGC simply reduces the gain of the receiver - and it will respond
mainly to the strongest signal in the passband. Actually it responds to
the integral of all the signals in the passband, but if there is a
single stronger one it
hold. exhale.
again.
Al W6LX
From: Wes Stewart <wes_n...@triconet.org>
To: elecraft@mailman.qth.net
Sent: Monday, March 6, 2017 10:19 AM
Subject: Re: [Elecraft] [K3] AGC White Paper
In Al's very nicely done paper he has this par
In Al's very nicely done paper he has this paragraph:
"The purpose of Automatic Gain Control (AGC) is to reduce the range of the
signals seen by the sensitive stages in the receiver. The AGC stage is
designed to vary its gain depending on the input signal; stronger signals
get less
Very nice report - thanks!
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog: http://la3za.blogspot.com,
LA3ZA Unofficial Guide to K2 modifications:
http://la3za.blogspot.com/p/la3za-unofficial-guide-to-elecraft-k2.html
--
View this message in context:
Very nice Al Thanks.
73,
Fred KE7X
From: Elecraft <elecraft-boun...@mailman.qth.net> on behalf of Al Lorona
<alor...@sbcglobal.net>
Sent: Sunday, March 5, 2017 10:50 PM
To: Elecraft Reflector
Subject: [Elecraft] [K3] AGC White Paper
I spent
Al, your paper looks very helpful for the situation when the concepts need
to be studied. After one has a reasonable understanding of the concepts, the
stituation that comes up now and then is wanting to change some of the AGC
parameters in the K3. I don't know about others, but I tend to forget
Thanks Al. A very useful paper.
Now to use SLP=15 for digital, where I want the AtoD to not have
to deal with a big range, while using something with more
dynamic range for voice/CW.
73 Bill AE6JV
On 3/6/17 at 9:50 PM, alor...@sbcglobal.net (Al Lorona) wrote:
I spent a little bit of time
I spent a little bit of time this weekend and put together yet another K3 AGC
(YAKA) "white paper" to put some measurements and discussion of the results
down in the hope that others may benefit. Maybe it'll help folks understand AGC
better by demystifying some of the K3 idiosyncrasies. I hope
26 matches
Mail list logo
