[Elecraft] K3 Hardware Updates

[Ron D'Eau Claire]

Well, it shouldn't hurt to do the mod, but I agree with David if you can't
find any noise.

The reason 3.24 is required is that it provides a menu entry for changing
the bus timing as described in the procedure. A slightly different timing is
required for stable operation once the diodes and resistors are added. 

If you try to load the firmware and change timing without adding the
resistors and diodes, or if you add the resistors and diodes and do not
change the timing, the VFO may become unstable, making un-commanded QSYs.
(On my K3 they were in 100 Hz steps.) 

The default timing in all the firmware, including 3.24 and up, is correct
for K3's that do not have the diodes and resistors added, so you need do
nothing after upgrading your firmware if you haven't added the parts. Your
K3 will continue to work FB just as always. 

A revised mod procedure will be posted Monday to make that point clear. 

Ron AC7AC

-----Original Message-----
In a recent message, Roy Morris <w4wfb at carolina.rr.com> wrote ...
>
>Now that my K3s have v. 3.25 firmware,
...
>  While I have access to the PCB, why not go ahead and install the VFO 
>tuning noise reduction mod even though I do not experience noise during 
>VFO rotation on 6, 10, and 60 meter bands.  You might say "if it ain't 
>broke, don't fix it".

The mod notes for the VFO Tuning Noise Reduction do say, in bold type..

"IMPORTANT:  You must complete the modification as described below 
before using firmware version 3.24 or later. Failure to do so will 
result in erratic behavior of your K3."

That seems to imply that even if you don't notice to be broke, it may 
be.

73
-- 
David G4DMP
Leeds, England, UK
------



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