How do I set the AGC on my loose coupler receiver? :-) I'm old, but
I've never used the RF Gain on my K3.
73,
Fred K6DGW
- Northern California Contest Club
- CU in the Cal QSO Party 1-2 Oct 2016
- www.cqp.org
On 10/28/2015 6:19 PM, Bob McGraw - K4TAX wrote:
Don is absolutely correct.
As
Back in 1923, in order to receive a signal, the following adjustments
must be made and possibly repeated to get the optimum performance (not a
simple matter and easily upset): The input coil (inside box) is adjusted
to resonate at the desired receiving frequency using the two tap
selectors on
Although I hadn't noticed it before, I would say that design in the K2
is more about stability and DC offsets than anything to do with pick up
of the BFO. The balanced demodulator and last two crystals deal with that.
The old, basically AM sets, used high level, unbalanced detectors. That
David,
I do not understand your logic.
Let's divorce the AGC from the product detector for a moment. The K2
takes the input to the AGC circuit from the IF and converts it to a
frequency that is removed from the IF signal. The AGC circuit produces
a DC voltage that is used to control the
Don is absolutely correct.
As many may know, I do assist hams with issues associated with many
different products here and elsewhere. The biggest issue I encounter is
the ham that says " well somebody told me to blah blah blah blah
..and it would work best". In many cases, nothing
Hi guys
Old topic from a Old Newbie. I have been fooling around with PSK 31 and I
have it set up and working but I do have a question. Do most ops using
this mode turn off the AGC and then ride the RF gain control because of the
stronger signals in the band pass killing off the weaker
Lee,
I do not turn off the AGC, but instead use the filters to isolate the
signal of interest with the Width and Shift controls in the event that a
strong signal is monopolizing the waterfall.
Yes, you can do it your way, but I believe my way will allow you to copy
weaker signals easily.
I only work PSK on occasion. I do work a lot of RTTY tho...like V73D on 10M
about 5 min ago. I never turn AGC off on any mode. Never understood why anyone
would want to but I've only been licensed for 57 years, so maybe I missed something.
On 10/27/2015 3:32 PM, Leroy Buller wrote:
Hi
What Don says, plus if you're using a sound card interface (any flavor)
to decode the digital, keep the LIN OUT low (mine is set to 1, zero is
off) THEN keep the audio as light as possible (driver software) into the
computer decoder. What you want is to NOT let the sound card AGC get
When I was using a SignaLink, I used the RF gain control to keep
strong signals from overloading the input to the computer. I
would also use the Shift and Width controls to isolate a signal,
and got a 250 Hz filter to help. Dropping the RF gain control
until the band noise almost disappeared
I also run with no AGC... It makes a major difference in how the data
is copied...
--
Thanks and 73's,
For equipment, and software setups and reviews see:
www.nk7z.net
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I do run a fair amount of PSK-31 and much enjoy the same. In that
regard I always run AGC-F. For selectivity, in dealing with strong
signals in the midst of weak signals, I shift the passband and tighten
the bandwidth as needed.RF gain is always adjusted based on band
noise such that
I run the K3 with AGC-Off in all digital modes and rely on the roofing/DSP
filters to edge out really strong signals. Most of the time the software
will compensate in pulling the weak signals out of the mud a lot better
than your rig making them louder.
I would suggest playing with each setting
On Tue,10/27/2015 3:50 PM, Wes (N7WS) wrote:
I never turn AGC off on any mode. Never understood why anyone would
want to but I've only been licensed for 57 years, so maybe I missed
something.
I started three years before you, so maybe I remember more from back
then. :) In those older days,
ber 27, 2015 6:02 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 - PSK31 - AGC/No AGC
On Tue,10/27/2015 3:50 PM, Wes (N7WS) wrote:
> I never turn AGC off on any mode. Never understood why anyone would
> want to but I've only been licensed for 57 years, so maybe I missed
> some
Yes but...
Those receivers didn't have product detectors and BFO leakage into the AGC
detector was an issue.
.On 10/27/2015 6:01 PM, Jim Brown wrote:
In those older days, it was quite common for CW ops to turn down the RF gain
and turn up the AF gain. In effect, this more or less
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