Of course Robert, the ATU was OFF. My typing error. Any measurements made with it ON would be meaningless.
73 Stewart G3RXQ On Wed, 4 Nov 2009 07:14:43 -0600, Robert Naumann wrote: > After reading your table and comments again, I'm also curious why you are > using the antenna tuner in these measurements? > > Shouldn't the internal ATU be OFF in order to evaluate the SWR meter? > > With the tuner on, the K3's SWR meter is showing the results of the tuner > doing it's job - no? I would hope that the K3 SWR meter would read different > in this case. > > > -----Original Message----- > From: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Stewart > Sent: Wednesday, November 04, 2009 2:45 AM > To: Elecraft Reflector > Subject: [Elecraft] K3 SWR Accuracy - reprise > > Hi, > Now traffic on the new K3 Macro functions has somewhat died down, > I would like to raise again the issue of the K3's SWR measurement > accuracy. > > I did some tests using dummy loads and a LP-100 meter as follows. > > The dummy load is a precision 100W one which I measured with a VNA > and has a VSWR of <1.03 from 1 to 30 Mhz. To simulate a 2:1 VSWR > I used another dummy load (not quite as good) in parallel. > > The K3 output was from ANT1 using the internal ATU. The ATU was > automatically tuned to 1:1 on all bands. > The results I got for 2:1 VSWR are as follows:- > > LP-100 K3 > 160 1.99 1.8 > 80 1.99 1.8 > 60 1.99 1.8 > 40 1.95 1.8 > 30 1.97 1.6 > 20 1.97 1.4 > 17 1.97 1.3 > 15 1.96 1.2 > 12 1.96 1.5 > 10 1.96 1.4 > > As can be seen my K3 SWR indication consistently under reads. > However, it really gets bad on 20,17 & 15. > > From previous replies I understand that this under reading would > be compensated for in the firmware, sometime in the future . > > Is this still on the list of problems to be addressed ? > > 73 > Stewart G3RXQ > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
