Bill,
Congratulations, it sounds like you have achieved success.
Once set the K2 alignment usually remains stable for a long time. If it
ain't broke, don't fix it!
Don W3FPR
On 6/17/2019 10:36 AM, Bill Coleman wrote:
Well, I think I finally got it sorted.
I replaced D1 and D2 on my KAT100. One of the diodes was good, the other was
likely bad since I couldn’t get the SWR bridge to null, but I destroyed it
while extracting it from the board.
New diodes are in machined socket pins, which will make them easy to replace
(or test) later, if need be. SWR bridge calibration went swimmingly.
As for the filter problem, I did a CAL FIL and checked OP1 on LSB and USB, All
four filters on CW and RTTY.
Other than a few minor tweaks, the only thing I ran into was FL1 on CW (which
is a 1.0 filter) was about 200 Hz low. FL3 (0.16) was about 30 Hz high.
After the CAL FIL, the radio sounds normal again. I don’t believe I’ll do a
full alignment.
Thanks for your assistance.
On Jun 12, 2019, at 10:09 PM, Don Wilhelm <[email protected]> wrote:
Bill,
Yes, do the CAL FIL calibration first. If that does not cure anything, then
proceed with the rest of the alignment, but I doubt if that will help much -
the K2 alignment is usually quite stable over time.
The bandpass filter and other alignments are not going to change the
relationship between the SSB filter and the CW filter - only CAL FIL will do
that.
If you still have a problem after the full CAL FIL, you will usually find a
problem in the CW filter bank - like a bad crystal (but that does not happen
often). Reflowing the soldering on the IF crystals on the RF Board may help.
73,
Don W3FPR
On 6/12/2019 8:23 PM, Bill Coleman wrote:
Yeah, this is looking more like a calibration problem.
I’m listening to W1AW code practice on 14.0475. As I cycle through the filters
the S-units are roughly the same through OP1, 0.4 and 0.16. But on the 1.0
bandwidth, it is often 1-2 S-units lower. If I tune about 200 Hz lower, I get
the same number of bars.
I’ll update you when I have a chance to do the calibration.
Bill Coleman, AA4LR, PP-ASEL Mail: [email protected]
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901
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