[Elecraft] K3 - RF Board - C238 - AGC change

[N2TK, Tony]

Tnx Andy for the info. I decided against installing the additional caps. I
am using 4.61. The AGC seems to work fine. Will have another chance to check
it at KP2M for the ARRL SSB upcoming contest.

 

73,

N2TK, Tony

 

From: Andrew Catanzaro [mailto:acatan at wi.rr.com] 
Sent: Tuesday, February 05, 2013 9:33 AM
To: tony.kaz at verizon.net; Elecraft at mailman.qth.net
Subject: K3 - RF Board - C238 - AGC change

 

I did the mod shortly after it was described here.  The change in AGC
behavior was not subtle.  Yes it improved copy in pileups when I was the DX.
I found it a bit difficult to cope with, though, because the changes in
audio strength amongst the stations was more than my ears have an appetite
for.  I had some trouble putting up with the loud signals challenging my
ears by the time I had the volume up enough to discern the weak ones.  I
believe subsequent firmware changes have obviated the need for this mod.  I
plan on removing the extra cap. YMMV.  This is only my experience and my
observations. 
 
73,
 
Andy
 
 
                                                                      
Message: 11
Date: Mon, 04 Feb 2013 16:37:20 -0500
From: "N2TK, Tony"  <mailto:tony.kaz at verizon.net> <tony.kaz at verizon.net>
To: "'elecraft'"  <mailto:elecraft at mailman.qth.net>
<elecraft at mailman.qth.net>
Subject: [Elecraft] K3 - RF Board - C238 - AGC change
Message-ID:  <mailto:001801ce031f$d0937fc0$71ba7f40$@verizon.net>
<001801ce031f$d0937fc0$71ba7f40$@verizon.net>
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A year or so ago there was discussion about adding additional caps to C238
to reduce IMD. I believe it was two 1-uf caps. 
 
What was the outcome of that? Did it make a noticeable difference in pileups
or for weak signal detection?
 
Is it a recommended mod?
 
 
 
73,
 
N2TK, Tony