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
