[Elecraft] P3 and Centering the Display

[K5MWR]

As an example of how you can set up markers, span and center frequency.

#MKA1;#MFA+00014077000;#MKB1;#MFB+00014078000;#SPN000050;#CTF+00014077750;

73,Dave K5MWR


On 12/7/2016 9:22 AM, Sean Logghe wrote:
> I was wondering if anyone has come up with a macro that will (reliably) move
> the P3 to a frequency (K3 VFO A) and center that frequency on the display?
>
>   
>
> I have a P3 w/ SVGA. I am using the latest firmware(MCU 1.60; SVGA 1.34;
> FPGA 1.04). I am testing macros using the latest P3 utility(1.16.3.15)
> Command Tester. (FYI - I live in Fixed Tune Mode.)
>
>   
>
> Consider the following scenario: Three macros that each move (FA) to 2.5
> MHz, 5.0 MHz, and 10.0 MHz respectively and then center the display (#CTF or
> #CTF 0 or #RCF 0 or #FXT0;#FXT1; or even just an FA again).
>
>   
>
> (And yes, I do have more useful needs for this, but this seems like a simple
> example.)
>
>   
>
> Execute them one after the other.
>
>   
>
> After each macro, I am always left with the Frequency Cursor at the left
> edge of the P3 display which is the desired frequency and now defined as the
> P3 "Center Frequency" as displayed in the middle of the top edge of the
> display (this is also the frequency indicated at the left of the top edge of
> the display, the "Lower Frequency Limit").
>
>   
>
> If I execute the same macro a second time I am centered on the display just
> fine. The breakdown seems to occur if I am commanding a new frequency which
> is not within some range of the current P3 display. IE. - Going from 2.5 MHz
> to 5.0 MHz fails but from 2.706 MHz to 2.5 MHz works.
>
>   
>
> (Bulletin! - Extensive (!) testing has shown that the 2.5 MHz macro will
> work properly if the starting frequency is in the range of 100KHz - 2.999
> MHz; the 5.0 MHz macro will work properly in the starting frequency range of
> 4.800 - 5.999 MHz; and the 10 MHz macro will work properly in the starting
> frequency range of 9.000 - 22.999 MHz.)
>
> I think that (from K3 relay noises) those boundaries coincide with some band
> filter switching. I have no idea what that means.
>
>   
>
> I have tried every command combination that I can think of to no avail.
>
>   
>
> Breaking the macro into separate components works fine.
>
>   
>
> But it would be nice to accomplish this without having to execute two
> separate macros.
>
>   
>
> Of course the internal programming of the P3 is a black box to me, but the
> behavior suggests that it may be a timing issue for the macro execution. It
> is as if, after executing the FA command, the centering commands are still
> seeing  the previous frequency and falling back on the default behavior of
> parking at the left edge of the display whenever it thinks that it is being
> commanded out of the range of the current P3 display. Even though it isn't.
>
>   
>
> But that may just be a fantasy I have created in my own mind!
>
>   
>
> I am happy to entertain any suggestions. Keep in mind that the manual would
> make you think that several options should work just fine but the execution
> isn't so copacetic. You might want to try things out with the Utility's
> Command Tester. Maybe my understanding of what should be possible needs
> realignment.  ;)
>
>   
>
> Or perhaps I should just resign myself to the reality that it doesn't work
> the way I want it to and move on!  :)
>
>   
>
> Thanks for any hints or tips.
>
>   
>
> Sean
>
> KB2CKN
>
>   
>
>   
>
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