On Feb 13, 2006, at 10:33 AM, Jim Harris wrote:
My K2/100 (S/N 4787) is about 10 months old. My
question is at what point, or ever, should all the
initial alignments be repeated? There are several
reasons for asking the question other than electronic
components simply drifting a bit with age.
Old tube-type rigs required this every year or so, because the heat
aged the components. Modern components and equipment are much better
and don't get nearly so hot.
1. Recently I've noticed when it is initially turned
on the received frequency is about 100 hz high judged
by the pitch of people's voices that I know. After
20-30 minutes they drift to near exact frequency.
I had this sort of problem before I installed the PLL and BFO
stability mods. Your K2 may be recent enough to have come with these
modifications.
2. When initially turned on and transmitting right
away I've had reports of distortion like I'm crowding
the mike.
Ditto the above.
3. When doing the initial alignment I had a terrible
time with zero beating due to bad hearing. A frequncy
counter finally helped solve that to some degree.
The K2 is never going to be a precise frequency meter. Due to the
nature of the tuning mechanism, it could have an error as large as 30
Hz. I wouldn't sweat a re-calibration unless you find it to be a kHz
or two off.
4. I did not use spectrogram as it seemed confusing
and my radio seemed to play well enough without it.
It is still equal to or better than my IC746Pro.
Programs like spectrogram can really help to adjust the filters
accurately.
I just hate to fix it if it's not broke. But, I'm
wondering if I could squeeze a little more performance
out of it. I hate to have my K2 on the bench for 2-3
days and not be able to use it. Well, what does
everyone say. Go for it or not?
Thanks for the help and bandwidth.
Wait until you want to make a mod or some other change. Enjoy it in
the meantime.
Bill Coleman, AA4LR, PP-ASEL Mail: [EMAIL PROTECTED]
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901
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