Re: [Elecraft] KAT2 and CALS
Phil, If the SWR after a TUNE is not low enough for your tastes, just try doing it again, it often finds a better match. There is also the ALT setting which uses a more refined algorithm, but takes longer. It may also be that the load is outside the range of the KAT2 on some bands - while the KAT2 has a wide matching range, it does have its limits. Very high impedance loads do give it difficulty. You can try adding or subtracting some feedline (1/8 wavelength at a time for the band having difficulty) to see if you can produce a better compromise antenna system input impedance. 73, Don W3FPR Phillip Heller wrote: So I've completed the KAT2, so far so good. I get C55 to 003 +/- 2 (bounces back and forth). R1 set per DL1 calculation, R2 set with matching wiper resistance. CALS reports 1:1 on 80 and 40, though from 30 through 10 it reports from 1.1:1 to 1.9:1 respectively. The documentation says not to expect 1.0:1 on the higher bands, though 1.9:1 does seem pretty high. Any ideas? --phil ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.176 / Virus Database: 270.10.12/1911 - Release Date: 1/23/2009 7:28 AM ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] KAT2 and CALS
I was actually referring to the SWR calibration step near the end of Power Calibration in the build document, which is against the 50 ohm dummy load. However, it's really of no concern now, as I re-calibrated today against a different dummy load using a known accurate SWR meter and got 1.0:1 on all but 10m (where I got 1.1:1). Thanks for the reply! --phil On Jan 24, 2009, at 8:29 AM, Don Wilhelm wrote: Phil, If the SWR after a TUNE is not low enough for your tastes, just try doing it again, it often finds a better match. There is also the ALT setting which uses a more refined algorithm, but takes longer. It may also be that the load is outside the range of the KAT2 on some bands - while the KAT2 has a wide matching range, it does have its limits. Very high impedance loads do give it difficulty. You can try adding or subtracting some feedline (1/8 wavelength at a time for the band having difficulty) to see if you can produce a better compromise antenna system input impedance. 73, Don W3FPR Phillip Heller wrote: So I've completed the KAT2, so far so good. I get C55 to 003 +/- 2 (bounces back and forth). R1 set per DL1 calculation, R2 set with matching wiper resistance. CALS reports 1:1 on 80 and 40, though from 30 through 10 it reports from 1.1:1 to 1.9:1 respectively. The documentation says not to expect 1.0:1 on the higher bands, though 1.9:1 does seem pretty high. Any ideas? --phil ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.176 / Virus Database: 270.10.12/1911 - Release Date: 1/23/2009 7:28 AM ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] KAT2 and CALS
So I've completed the KAT2, so far so good. I get C55 to 003 +/- 2 (bounces back and forth). R1 set per DL1 calculation, R2 set with matching wiper resistance. CALS reports 1:1 on 80 and 40, though from 30 through 10 it reports from 1.1:1 to 1.9:1 respectively. The documentation says not to expect 1.0:1 on the higher bands, though 1.9:1 does seem pretty high. Any ideas? --phil ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
