[Elecraft] K3 Hardware Updates

[Joe Planisky]

Now doggonnit, let's get our stories straight!

Ron D'Eau Claire says:

> ... if you add the resistors and diodes and do not
> change the timing, the VFO may become unstable,

Eric Swartz says:

> There is no downside to making this h/w mod, even if you do not enable
> the menu option.

Am I missing something, or are these two statements contradictory?   
Maybe Wayne can be the tie-breaker :-)

73
--
Joe KB8AP



On Aug 23, 2009, at 4:08 PM, Ron D'Eau Claire wrote:

> 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
>