Hi Bruce:
1. Has anyone come up with a good RF gain control, aka AGC threshold control?
Please, no lectures about how the K1 doesn't need it, or how the RF
attenuator works great.
2. In searching the archives, I found hundreds of posts about the RIT range.
Too many to sort through. Is the mod in the manual the best and simplist for
reducing the RIT range, or was there a definitive posting of a better one?
While I'm at it, is there a drop-in replacement for the RIT control that
has a
center detent?
You'll certainly no lectures from me, pal.
However, here's some info which appears to have worked for one builder:
Date: Sun, 15 May 2005 15:42:01 +1200
From: Ron ZL1TW <[EMAIL PROTECTED]>
To: [email protected]
Subject: [Elecraft] K1 revisited
Hi,
In a recent posting I mentioned I was not happy with the AGC
action of the K1 after pulling it out of retirement for a QRP
Sprint on this weekend.
This is an account of what I consider, improves the set
generally. I claim no originality for the ideas, and any K1
purists or designers might like to switch to the next message
right now! ( Definitely YMMV)
The AGC "problem" of giving a burst of audio when a strong
signal made itself present was cured 99% by altering C31 to 1uf
( from 2.2UF) and replacing C67 with a .22uf cap ( was also
2.2uf) That sped up the AGC action and after using the set in
the first 1/2 of the Sprint last evening, I was more than happy
with the AGC.
However....probably being spoilt by the K2, I found the tuning
rate a tad delicate for my fat fingers, and the RIT action was
gross.
OK.....I know it has a large range so the set can be used in
SPLIT mode....but I doubt I will use that mode on the K1, so I
looked in the Elecraft Reflector listings and dug out a
solution posted on 20 Jul 2001 under the heading "Re: K1 RIT
mod", where the RIT is modified to a logrithmic action that
gives a small range of tuning over about the first 25% of the
controls throw, ( each side) but still retains most of the
original total range.
It was a tight fit getting the parts in and I had to use 1/8w
resistors to obtain a decent fit, but it works fine. Now the
VFO band spread. I was using the 68pf cap for C2, which gave me
a 80khz tuning range. I altered C2 to 47pf and added an extra
turn on L1 , and that gives me a tuning range of 51khz. A wee
bit under the 55khz we are allowed here, but perfectly
acceptable to me.
The second half of the Sprint event is on tonight, and I am
looking forward to joining in with my "re-Vamped" K1 . From
using the set last night, there is certainly nothing wrong with
the K1's receiver. I had forgotten what a fun set it is.
Cheers.......Ron ZL1TW
73,
Tom Hammond N0SS
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