Ron D'Eau Claire wrote:
For CW signals the solution was easy. One added a hard limiter to the
audio channel. If a really strong signal was encountered without warning, it
was clipped of at some preset maximum volume (below the threshold of pain,
hopefully). Most operators used the limiter at
to back to back diodes (this is
best done with a resistor in series to smooth the response.
David
G3UNA
From: Fred Jensen [EMAIL PROTECTED]
Date: 2007/03/13 Tue AM 06:52:30 GMT
To: Elecraft Reflector elecraft@mailman.qth.net
Subject: Re: [Elecraft] AGC Independent S-Meter?
Ron D'Eau Claire
Lots of good info about AGC, but I'm thinking a lot of it is not that
useful today.
In the old days, it sounds like you HAD to turn the AGC off for things
to work right. That's no longer the case and our operating habits can,
and have, changed.
In my case, I leave AGC on 100% of the time. I'll
, March 12, 2007 11:56 PM
To: elecraft@mailman.qth.net
Subject: RE: [Elecraft] AGC Independent S-Meter?
Dr Megacycle wrote:
Well, I have late 1950s Hammarlund HQ170 whose S-meter works just
fine with the AGC/AVC turned on or off. As far as I have been able to
ascertain, the S-meter functions
Dettinger
Sent: Monday, March 12, 2007 10:56 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] AGC Independent S-Meter?
For CW signals the solution was easy. One added a hard limiter to the
audio channel. If a really strong signal was encountered without warning, it
was clipped of at some
Describing the background was intended to put the AGC discussion in context
and show why AGC and S-meters are so closely integrated. A receiver with an
S-meter is just a sensitive, selective RF voltmeter. Without AGC that
voltmeter has a very limited useful range. That's why S-meters didn't
appear
In a message dated 3/13/07 7:29:41 AM Eastern Standard Time,
[EMAIL PROTECTED] writes:
Can those of you who turn AGC off tell me why?
The band sounds better that way, IMHO.
What does it do for you
that the AGC doesn't?
All of this is IMHO, from a 99%-CW operator with amateur-only
@mailman.qth.net
Sent: Sunday, March 11, 2007 11:41 PM
Subject: RE: [Elecraft] AGC Independent S-Meter?
Sandy,
As far as I know, there is no direct relationship between the strength of
a
signal and receiver AGC.
My AD8307 power meter can measure signal strengths directly off an antenna
Sandy - You wrote:
Circuitry wise, an AGC/AVC free S-meter is an oxymoron! Can't
have one
without the other.
Well, I have late 1950s Hammarlund HQ170 whose S-meter works just
fine with the AGC/AVC turned on or off. As far as I have been able to
ascertain, the S-meter functions
Dr Megacycle wrote:
Well, I have late 1950s Hammarlund HQ170 whose S-meter works just
fine with the AGC/AVC turned on or off. As far as I have been able to
ascertain, the S-meter functions identically with or without the AGC/
AVC turned on. It was designed to do so.
For CW signals the solution was easy. One added a hard limiter to the
audio channel. If a really strong signal was encountered without warning, it
was clipped of at some preset maximum volume (below the threshold of pain,
hopefully). Most operators used the limiter at all times in case a huge
] AGC Independent S-Meter?
As I typically leave the AF gain at maximum and use the RF gain control to
set
the listening level (Better signal to noise ratio.) the S-meter is not too
useful. Also with the AGC turned off the S-meter is not operational.
Anyone have any ideas for an AGC independent S
Darrell,
Certainly a meter could be devised to indicate the strength of the signals
making it through the IF filter - you have the correct points in mind - all
you have to do is tap in at the input of the IF amplifier and then amplify
the signal(s) and drive whatever circuits you want (even a
In a message dated 3/11/07 12:24:04 PM Eastern Standard Time, [EMAIL PROTECTED]
writes:
Anyone have any ideas for an AGC independent S-meter?
Here's what I've used for 40+ years:
Ears
--
I have never really understood the fascination with AGC and S-meters in ham
radio for CW. For AM
]
To: elecraft@mailman.qth.net
Sent: Sunday, March 11, 2007 4:37 PM
Subject: Re: [Elecraft] AGC Independent S-Meter?
In a message dated 3/11/07 12:24:04 PM Eastern Standard Time,
[EMAIL PROTECTED]
writes:
Anyone have any ideas for an AGC independent S-meter?
Here's what I've used for 40+ years
On March 11, 2007 04:16 pm, Sandy W5TVW wrote:
Circuitrywise, an AGC/AVC free S-meter is an oxymoron! Can't have one
without the other.
Why not?
--
Darrell Bellerive
Amateur Radio Stations VA7TO and VE7CLA
Grand Forks, British Columbia, Canada
___
Sandy,
As far as I know, there is no direct relationship between the strength of a
signal and receiver AGC.
My AD8307 power meter can measure signal strengths directly off an antenna
if called upon to do that, it goes down to -80 dBm (about S-8) with no other
amplification. This is strictly a
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