As the principle designer of the K1, I just love these AGC circuitry
discussions, and thought I'd better put in my 2.5 cents.
The K1's present AGC circuit, being AF-derived, is a compromise between
attack time and recovery time. This topic has been the subject of
scholarly efforts by Haward,
the K1's AGC just the way it is ... for
now :-)
- Keith KD1E -
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of wayne burdick
Sent: Wednesday, April 05, 2006 4:06 PM
To: Elecraft Reflector
Subject: [Elecraft] Re: K1 AGC time constant [and how to radically
]
To: Elecraft Reflector Elecraft@mailman.qth.net
Sent: Wednesday, April 05, 2006 1:05 PM
Subject: [Elecraft] Re: K1 AGC time constant [and how to radically improveK1
AGC]
As the principle designer of the K1, I just love these AGC circuitry
discussions, and thought I'd better put in my 2.5 cents
I think what Ron and I were shooting for was not a really fast AGC but more
of a Not-so-gosh-darned slow AGC.
Wayne...doesn't 9 to 15 seconds for the S-meter to drop seems excessively
long to you? Especially for a QSK rig.
When I changed C31 from 2.2 to .22 the hang time seemed to approximate
Tom,
The selected part really is 2.2 uF, which provides a long enough AGC
hold time to prevent annoying leading-edge effects during slow CW copy.
If you mostly listen to much faster CW, you can certainly drop the
value.
In any case, the decay time will be roughly proportional to the
On Apr 5, 2006, at 9:59 PM, Rick Dettinger wrote:
It wouldn't be to difficult to put a panel mount RF Gain pot in place
of the
AF Gain control.
I agree that this would be possible, but I'm not sure how many K1
owners would want to make this tradeoff. I use the AF GAIN control
constantly.
I want to change C31 on my K1 RF board to 1uF at the same time I change my
tuning rate to 150 khz. C31 is an electrolitic capacitor as supplied,
however, in looking thru the K1 and K2 parts lists, I find only non
electrolitic capacitors for 1uF. Does it matter for C31? This seems to be
the
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