Re: [Elecraft] How to get SWR

2016-09-24 Thread Matt Zilmer iPhone
All diode-based SWR bridges have significant error at lower power levels. I suggest the use of 3W or higher for TUN PWR. 73! -Matt Always store beer in a dark place. - R. Heinlein [iPhone] > On Sep 24, 2016, at 04:02, Holger Schurig wrote: > > Okay, figured it

Re: [Elecraft] How to get SWR

2016-09-24 Thread w4sc
Holger, Glad you solved the problem. For “TUNE” hold, I have my KX2 is set to a fixed level (3 Watts) by the TUN PWR menu entry. So the power level issue was masked in my setup. I don’t know what minimum power level is required for an accurate SWR reading, and ATU tuning. The designers may

Re: [Elecraft] How to get SWR

2016-09-24 Thread Holger Schurig
Okay, figured it out. I don't have a real dummy load, but a BNC terminator with 50 Ohm. This one is rated for only 0.5W, which I used as PWR setting. The SWR bargraph (while TUNE is active) start to appear when I use a TX power of 0.4W ... 0.5W. However, the SWR display (e.g. "6.6-1") in the

Re: [Elecraft] How to get SWR

2016-09-23 Thread w4sc
The commands are being sent too close together. Place a minimum 100ms delay between the SWH16 and following DS command. Do not send any other commands until after second SWH16. Four macros were setup to allow “manual” delay between commands. I don’t see a direct way to allow a

Re: [Elecraft] How to get SWR

2016-09-23 Thread Walter Underwood
I think we’ve hit the limit of my knowledge on this. Sorry. wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Sep 23, 2016, at 1:14 PM, Holger Schurig wrote: > > Hi Walter, > > btw, thanks for all your input! > > > I tried the

Re: [Elecraft] How to get SWR

2016-09-23 Thread Holger Schurig
Hi Walter, btw, thanks for all your input! I tried the swr_sweep.py program from this discussion and here I still get only the DS output that doesn't tell me anything: WRITE: MN023; WRITE: MN023;MP001; WRITE: SWH16; WRITE: FA0001400; WRITE: FA; READ: FA0001400; WRITE: FA0001400;

Re: [Elecraft] How to get SWR

2016-09-23 Thread Walter Underwood
I worked on some Python code to do this, but programming the KX3 was pretty flaky. It is easy to get out of sync with the commands and responses. Also, the radio needs varying and undocumented amounts of time to respond to different commands. The program you first linked to is a little more

Re: [Elecraft] How to get SWR

2016-09-23 Thread Holger Schurig
Hi Walter, I'm not going to learn NodeJS, npm, gulp and JavaScript to get the SWR out of my KX3 :-) I'd rather learn in a generic way how to get the SWR. I however checked out the source, and in wizkers/oem/radio/www/js/app/instruments/elecraft/driver_frontend.js it does in this.tune =

Re: [Elecraft] How to get SWR

2016-09-23 Thread Walter Underwood
I recommend the Wizkers app. It is portable across several kinds of computers. 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

[Elecraft] How to get SWR

2016-09-23 Thread Holger Schurig
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