[Elecraft] KI6WX Crystal Filter Bandwidth Mod ?

[Don Rasmussen]

George Winship wrote:
>Which one did you choose, the 2.2 or the 2.5 KHZ?
Were you happy with the results?
============================================
George,

I chose the 2.5khz SSB bandwidth for K2 #3312 and
would suggest that to anyone who uses the SSB mode at
all. I was completely unhappy with the pinched audio
during SSB operation of my first K2 (#630) at any BFO
setting. The rig became a "CW only" option here.

With the new crystals in K2 #3312 and the wider KI6WX
bandwidth mod, I find that the BFO frequency can be
fine tuned just as if there were a TONE control for
receive audio on the rig. I use OP1 for midrange, OP2
for enhanced BASS, and OP3 for enhanced TREBLE. The
selectivity is still very good at 2.5khz (measured
using Spectrogram) and the improvement in clarity is
simply amazing.

I find that I'm using the K2 for everything I do now,
and recently reprogrammed my memories to reflect this.
I use the left column for CW (fast AGC) and the middle
column for SSB (SLO agc). 1=7.03c 4=14.03c 7=21.03c,
2=7.23L 5=14.23u 8=21.3u.

The right column is for WARC bands 3=10.1c 6=18.07c
9=24.89c and the "0" memory is for my 10m ground wave
net.

The additonal fidelity on SSB, and the improvement in
frequency stability (credited to another KI6WX mod)
for CW have transformed what was a very strong CW
novelty rig (K2 #630) into one of the best general
purpose HF's I've ever owned. 

73,
de WB8YQJ/6 Don
Carlsbad, Ca. 

gwwa5uih@hotmail.com 
Fri May 30 22:05:05 2003 

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--------------------------------------------------------------------------------

I am going to do this mod when I get the new crystals
and caps. Would
like some feedback from those who have done it. Which
one did you
choose, the 2.2 or the 2.5 KHZ? Were you happy with
the results? If by
chance you have done both, which did you like better
and why?

Thanks in advance.

73,

George, NC5G   K2-2217



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