The KAT3 cannot be completely removed from the circuit. When it is in "BYPASS" it uses very small L/C values to attempt to compensate for its own strays. There is not an actual bypass relay.
73, Wayne N6KR On Nov 4, 2009, at 6:10 AM, Stewart wrote: > 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 ______________________________________________________________ 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
