Bob,
Yes I did see your post thanks, but have not yet had the opportunity to
digest your results - but I will.
When you made these measurements, what settings did you use for the 'audio'
Hi-cut and Lo-cut?
My thinking was that I would first look at the SA612's output wile injecting
multiple
Guy, have one (or several) on me for suggesting such a sensible idea :-)
73,
Geoff
GM4ESD
Guy Olinger K2AV
On Sunday, December 12, 2010, at 10:04 AM, Guy Olinger K2AV wrote:
Thank you, Bob.
But you have robbed Geoff of his favorite whipping boy. We will have
to take Geoff out to a pub and
-Kennedy [mailto:gm4...@btinternet.com]
Sent: Sunday, December 12, 2010 6:30 AM
To: Bob Henderson
Cc: Elecraft Discussion List
Subject: Re: [Elecraft] An AGC Story
Bob,
Yes I did see your post thanks, but have not yet had the opportunity to
digest your results - but I will.
When you made
Chen,
It is not really my place to comment on this subject not having a K3 to
measure, but I would like to offer the following thoughts related to the
naughty things you mention.
Whereas measuring the receiver's audio output level vs.the level of a single
signal injected into the antenna input
phase noise signal generators.
73
John
--- On Sat, 12/11/10, Geoffrey Mackenzie-Kennedy gm4...@btinternet.com wrote:
From: Geoffrey Mackenzie-Kennedy gm4...@btinternet.com
Subject: Re: [Elecraft] An AGC story
To: Kok Chen c...@mac.com
Cc: Elecraft Discussion List elecraft@mailman.qth.net
Hi John,
The NPR test is, I agree, certainly a very useful method to expose IMD
problems, but I think that when used as a *diagnostic* tool the requirements
placed on the notch filter's bandwidth limits this method's versatility -
unless one is prepared to build a set of band reject filters
David Gilbert wrote:
Nice program, but it doesn't run with LP-Bridge if I want to have more
than one application (N1MM, CW Skimmer, K3_EZ, etc) interfacing with my
K3. It is fine for simplifying the changing of AGC settings, but not on
the fly during a contest.
I strongly agree.
On 12/10/2010 12:00 PM, elecraft-requ...@mailman.qth.net wrote:
Date: Fri, 10 Dec 2010 03:39:04 -0800 (PST)
From: Barry N1EUbarry.n...@gmail.com
Subject: Re: [Elecraft] An AGC story
To:elecraft@mailman.qth.net
Message-ID:1291981144656-5822793.p...@n2.nabble.com
Content-Type: text/plain
Fred,
For more on the K3 AGC system, please see the excellent study
by Jack Smith, K8OZA at:
http://cliftonlaboratories.com/elecraft_k3_agc_and_s-meter.htm
Careful study of Jack's tables would tend to support your belief that
the K3 could benefit from a higher threshold setting. Comparing
Very interested findings - Fred has a graph of AGC action with AGC
THR=8 labeled figure 3 on http://www.ke7x.com/home/the-k3-agc-story :
That graph is nearly identical to the information that Jack Smith,
K8OZA originally presented two years ago:
Chen,
Imagine that there are three parameters, the current two, plus a
upper threshold, after which the slope becomes 15 (i.e. flat at
S0 to THR, then constant SLOPE until upper threshold and then flat
from there until the front end starts to smoke),.
The AGC is already a three piece
Cady, Fred wrote:
I made some measurements and have posted the results for your perusal
and information at www.ke7x.com.
Very interested findings - Fred has a graph of AGC action with AGC THR=8
labeled figure 3 on http://www.ke7x.com/home/the-k3-agc-story :
So I ask this group: is it
Barry,
Without doing any measurements it may be difficult to say precisely, and
I would think there would be a bit of difference from one K3 to another.
However, there is a quick and easy way to accomplish that - note that
the S-meter increases as the RF gain is reduced. So if you want to
Thanks Don. I just realized that I can do some quick experiments to get my
answer using an XG2's s3/s9 capability and noting audio level increase with
AGC Off and then with AGC On and reducing RF Gain until same audio increase
is accomplished.
An aside to KE7X and W4TV: I too wish we could try
-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Barry N1EU
Sent: Thursday, December 09, 2010 8:11 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] An AGC story
Thanks Don. I just realized that I can do some quick
experiments
As I understand the graphs and operation:
AGC Threshold is the point at which AGC action starts. The higher the AGC
THR number, the higher point at which AGC starts. The highest AGC THR (8)
starts AGC action at S3. That is a pretty low level but any setting less
than THR 8 starts the
On Dec 9, 2010, at 12/99:17 AM, k...@aol.com wrote:
But, since AGC works on every signal in the passband, if there are
two signals - one S9 and the other S3 appearing at the same time,
the S3 signal will disappear because the AGC is knocking down the
S9 signal to an S3 level and
:05 AM
Subject: Re: [Elecraft] An AGC story
On Dec 9, 2010, at 12/99:17 AM, k...@aol.com wrote:
But, since AGC works on every signal in the passband, if there are
two signals - one S9 and the other S3 appearing at the same time,
the S3 signal will disappear because the AGC is knocking
That is why it would be highly desirable to be able to quickly change
AGC settings on the fly, especially when you consider the additional
effect that different band noise has on the optimum AGC profile. I can
understand Elecraft's reluctance to let users mess with the DSP code via
macros,
Dave,
You can *effectively* increase the AGC threshold by 10 dB very quickly -
just turn on the attenuator.
Actually, that is more effective than reducing the RF Gain because it
happens at the receiver input rather than at the IF.
Yes, you can turn the attenuator of the K3 on whether or not
This is exactly what I found useful during the CQ WW CW contest. I did some
500+ QSOs and found that it is easier to listen to the K3 with the
Attenuator on in the 20 m band. In this band this is something I rarely do
with the K2. This discussion on AGC threshold has perhaps told me the reason
OK, but that still doesn't address decay or slope ... parameters I might
want to quickly change dependent upon the amount and type of band noise
(such as when changing to the low bands or when thunderstorms are
active) or the number (not only the level) of signals (pileup or QRM).
I still say
check out K3_EZ
http://home.roadrunner.com/~n2bc/SW.htm
then connect and check out the AGC Setup page
GB 73
K5OAI
Sam Morgan
On 12/9/2010 8:49 PM, David Gilbert wrote:
OK, but that still doesn't address decay or slope ... parameters I might
want to quickly change dependent upon the amount
Nice program, but it doesn't run with LP-Bridge if I want to have more
than one application (N1MM, CW Skimmer, K3_EZ, etc) interfacing with my
K3. It is fine for simplifying the changing of AGC settings, but not on
the fly during a contest.
Dave AB7E
On 12/9/2010 8:18 PM, Sam Morgan
David Gilbert wrote:
OK, but that still doesn't address decay or slope ... parameters I
might want to quickly change dependent upon the amount and type of band
noise (such as when changing to the low bands or when thunderstorms are
active) or the number (not only the level) of signals (pileup
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