[Elecraft] How to get SWR

[Walter Underwood]

I recommend the Wizkers app. It is portable across several kinds of computers.

http://www.wizkers.io/ <http://www.wizkers.io/>

In the KX3, you get the SWR by fetching the display characters, then translating them to numbers. Kind of messy.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Sep 23, 2016, at 10:12 AM, Holger Schurig <holgerschurig at gmail.com> wrote:
> 
> Hi ho,
> 
> I want to programmatically get the SWR, or at least an approximation of the
> SWR via the serial cable.
> 
> I found an old application kx3swr.py (http://robert.butera.org/?p=380), but
> somehow this one returned always 0.0 as SWR back, which I didn't really
> believe. Basically the program does this:
> 
> select ATU menu: MN023;
> turn ATU to bypass: MP001;
> turn menu off: SWT09;
> set frequency: FA ... ;
> wait a bit
> turn TUNE button: SWH16;
> wait a bit
> get VFO data: DS;
> try to decipher it
> release TUNE button: SWT16;
> 
> However, my KX3 with firmware 2.38 always returns DS@@@@@>>@; as response.
> Even when I do the steps manually. Did this change with some recent
> firmware update, or did I miss something important?  Only when outside of
> TUNE I get some value, e.g. DS14³60°00.
> 
> 
> Also, dear Elecraft, in the K3&KX3 Programmers manual you wrote in the BG
> command description "CWT, SWR, and CMP readings not yet available". How
> long is "not yet" going to take?  :-)
> 
> Or, dear Elecraft, maybe you implement the RM command like the Kenwood
> TS850 or TS870 ...  (I have found them used in the hamlib source).
> 
> 
> 73, Holger
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