[Elecraft] Re: Transverter TRN3 and TRN6 setup problems

[Geert Jan de Groot]

On Mon, 9 May 2005 04:01:50 -0400 (EDT)  elecraft-request at mailman.qth.net wrote:
>>After setting up the TRN3 and/or TRN6 parameters in the K2 and returning to
>>normal operation, as soon as VFO knob turned the frequency on the display 
>>go to
>>what seems to a randome one, AND VFO input is ignored (?) as dispaly is
>>"locked".  Other TRN bands (TRN1, 2, 4, 5) work OK.
> I have not seen this problem quite as described, and am running the latest 
> firmware in the QRP configuration with internal tuner.   One thing that 
> might be happening is the initial displayed frequency might be uninitialized 
> so is randomly set out of band.  Try to use the direct frequency input 
> method to set the expected frequency.  (Band- and + together, enter digits).

Having done some experiments over the weekend myself, I definitely
found that the K2 gets confused if you change the RF frequency,
or the IF frequency.

Repeat-by: set TRN1 for 144 MHz, IF 28 MHz. Manual-enter 144.000 MHz,
Change the IF to 14 MHz. Note that the display is now off, and 
the PLL is out of band (and probably out of lock, alas).

Workaround: Manual-enter the start frequency after setting up
a transverter band. Do this on both VFO's!

I don't know what code space we have in the main MCU these days
(this has been a stumbling block from 1.x to 2.x firmware, and AFAIK
code size issues are preventing some other things from being implemented),
but IMHO it would be good if the K2 would auto-reset both VFO's
if either the RF frequency, or the IF settings change.

Geert Jan