K2 Power meter
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This has been beaten over and over I think but I haven't found
anything on it yet: I just got back from the lab at work and used a very well calibrated power meter to calibrate my KAT2 power meter. Now on 40m at home, I set my power control to 5w and tuner to Pout. The tuner now reads 2.9w. Not until I tune the requested power to 8 watts or so does the tuner say I'm putting out 5 watts. Isn't there a way to adjust it so that the requested power matches the tuner output power so that the S/ Power meter reads the right value? That's the most annoying part... Tom ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Tom,
No adjustment is required. In CALP state, the tuner must be working into a 50 ohm load for accurate power readings. If you are connected to an antenna that has a feedpoint impedance other than 50+j0 impedance, you can expect "unexpected" results. When you change the ATU menu to Auto and do a TUNE, the tuner has done its job of providing a 50 ohm match to the K2 and the power out will be as requested. 73, Don W3FPR Tom Campie wrote: > This has been beaten over and over I think but I haven't found > anything on it yet: > > I just got back from the lab at work and used a very well calibrated > power meter to calibrate my KAT2 power meter. Now on 40m at home, I > set my power control to 5w and tuner to Pout. The tuner now reads > 2.9w. Not until I tune the requested power to 8 watts or so does the > tuner say I'm putting out 5 watts. Isn't there a way to adjust it so > that the requested power matches the tuner output power so that the S/ > Power meter reads the right value? That's the most annoying part... > > Tom > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.375 / Virus Database: 270.13.20/2248 - Release Date: 07/19/09 05:57:00 > > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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I calibrated the tuner to a 50 ohm load on CALP. With the tuner tuned
to a non-50 Ohm load, the requested power does not match the output power by any definition of the word. Tom On Jul 19, 2009, at 9:48 PM, Don Wilhelm wrote: > Tom, > > No adjustment is required. In CALP state, the tuner must be working > into a 50 ohm load for accurate power readings. If you are > connected to an antenna that has a feedpoint impedance other than > 50+j0 impedance, you can expect "unexpected" results. > When you change the ATU menu to Auto and do a TUNE, the tuner has > done its job of providing a 50 ohm match to the K2 and the power out > will be as requested. > > 73, > Don W3FPR > > Tom Campie wrote: >> This has been beaten over and over I think but I haven't found >> anything on it yet: >> >> I just got back from the lab at work and used a very well >> calibrated power meter to calibrate my KAT2 power meter. Now on >> 40m at home, I set my power control to 5w and tuner to Pout. The >> tuner now reads 2.9w. Not until I tune the requested power to 8 >> watts or so does the tuner say I'm putting out 5 watts. Isn't >> there a way to adjust it so that the requested power matches the >> tuner output power so that the S/ Power meter reads the right >> value? That's the most annoying part... >> >> Tom >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> ------------------------------------------------------------------------ >> >> >> No virus found in this incoming message. >> Checked by AVG - www.avg.com Version: 8.5.375 / Virus Database: >> 270.13.20/2248 - Release Date: 07/19/09 05:57:00 >> >> ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Tom,
That is exactly what I said. In CALP, if the load is anything other than 50+j0, the power indication will be incorrect. In other words, the requested power may not equal the actual power. When you go to AUTO and do a TUNE, the forward power should be close to the requested power. 73, Don W3FPR Tom Campie wrote: > I calibrated the tuner to a 50 ohm load on CALP. With the tuner tuned > to a non-50 Ohm load, the requested power does not match the output > power by any definition of the word. > > Tom > > On Jul 19, 2009, at 9:48 PM, Don Wilhelm wrote: > > >> Tom, >> >> No adjustment is required. In CALP state, the tuner must be working >> into a 50 ohm load for accurate power readings. If you are >> connected to an antenna that has a feedpoint impedance other than >> 50+j0 impedance, you can expect "unexpected" results. >> When you change the ATU menu to Auto and do a TUNE, the tuner has >> done its job of providing a 50 ohm match to the K2 and the power out >> will be as requested. >> >> 73, >> Don W3FPR >> >> Tom Campie wrote: >> >>> This has been beaten over and over I think but I haven't found >>> anything on it yet: >>> >>> I just got back from the lab at work and used a very well >>> calibrated power meter to calibrate my KAT2 power meter. Now on >>> 40m at home, I set my power control to 5w and tuner to Pout. The >>> tuner now reads 2.9w. Not until I tune the requested power to 8 >>> watts or so does the tuner say I'm putting out 5 watts. Isn't >>> there a way to adjust it so that the requested power matches the >>> tuner output power so that the S/ Power meter reads the right >>> value? That's the most annoying part... >>> >>> Tom >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[hidden email] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> ------------------------------------------------------------------------ >>> >>> >>> No virus found in this incoming message. >>> Checked by AVG - www.avg.com Version: 8.5.375 / Virus Database: >>> 270.13.20/2248 - Release Date: 07/19/09 05:57:00 >>> >>> >>> > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.375 / Virus Database: 270.13.20/2248 - Release Date: 07/19/09 05:57:00 > > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Like I said before, the requested power is nowhere near the power read
by the tuner when tuned to a non-50 ohm load. But I am certain of the calibration of the tuner meter and when it says it is putting out 5 watts, the current draw is about 1.75 amps as I have confirmed with other K2 owners to be the draw at 5 watts. There's some weirdness going on somewhere, that is for sure. Tom On Jul 19, 2009, at 11:12 PM, Don Wilhelm <[hidden email]> wrote: > Tom, > > That is exactly what I said. In CALP, if the load is anything other > than 50+j0, the power indication will be incorrect. In other words, > the requested power may not equal the actual power. > > When you go to AUTO and do a TUNE, the forward power should be close > to the requested power. > > 73, > Don W3FPR > > Tom Campie wrote: >> I calibrated the tuner to a 50 ohm load on CALP. With the tuner >> tuned to a non-50 Ohm load, the requested power does not match the >> output power by any definition of the word. >> >> Tom >> >> On Jul 19, 2009, at 9:48 PM, Don Wilhelm wrote: >> >> >>> Tom, >>> >>> No adjustment is required. In CALP state, the tuner must be >>> working into a 50 ohm load for accurate power readings. If you >>> are connected to an antenna that has a feedpoint impedance other >>> than 50+j0 impedance, you can expect "unexpected" results. >>> When you change the ATU menu to Auto and do a TUNE, the tuner has >>> done its job of providing a 50 ohm match to the K2 and the power >>> out will be as requested. >>> >>> 73, >>> Don W3FPR >>> >>> Tom Campie wrote: >>> >>>> This has been beaten over and over I think but I haven't found >>>> anything on it yet: >>>> >>>> I just got back from the lab at work and used a very well >>>> calibrated power meter to calibrate my KAT2 power meter. Now >>>> on 40m at home, I set my power control to 5w and tuner to >>>> Pout. The tuner now reads 2.9w. Not until I tune the >>>> requested power to 8 watts or so does the tuner say I'm putting >>>> out 5 watts. Isn't there a way to adjust it so that the >>>> requested power matches the tuner output power so that the S/ >>>> Power meter reads the right value? That's the most annoying >>>> part... >>>> >>>> Tom >>>> ______________________________________________________________ >>>> Elecraft mailing list >>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>>> Help: http://mailman.qth.net/mmfaq.htm >>>> Post: mailto:[hidden email] >>>> >>>> This list hosted by: http://www.qsl.net >>>> Please help support this email list: http://www.qsl.net/donate.html >>>> --- >>>> --- >>>> ------------------------------------------------------------------ >>>> >>>> >>>> No virus found in this incoming message. >>>> Checked by AVG - www.avg.com Version: 8.5.375 / Virus Database: 270.13.20/2248 >>>> - Release Date: 07/19/09 05:57:00 >>>> >>>> >>>> >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> --- >> --------------------------------------------------------------------- >> >> >> No virus found in this incoming message. >> Checked by AVG - www.avg.com Version: 8.5.375 / Virus Database: 270.13.20/2248 >> - Release Date: 07/19/09 05:57:00 >> >> Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Don Wilhelm-4
I just realized something that may be throwing it off - I installed the
Elecraft 4:1 balun inside the rig and hard wired it to ANT 2 on the tuner after I'd done the bridge null - is it possible that that has thrown off that null and I am not actually getting a 50 ohm load to the front end? I'll have to redo that tonight and report back. Thanks for the help so far. Tom On Sun, Jul 19, 2009 at 11:12 PM, Don Wilhelm <[hidden email]> wrote: > Tom, > > That is exactly what I said. In CALP, if the load is anything other than > 50+j0, the power indication will be incorrect. In other words, the > requested power may not equal the actual power. > > When you go to AUTO and do a TUNE, the forward power should be close to the > requested power. > > > 73, > Don W3FPR > > Tom Campie wrote: > >> I calibrated the tuner to a 50 ohm load on CALP. With the tuner tuned to >> a non-50 Ohm load, the requested power does not match the output power by >> any definition of the word. >> >> Tom >> >> On Jul 19, 2009, at 9:48 PM, Don Wilhelm wrote: >> >> >> >>> Tom, >>> >>> No adjustment is required. In CALP state, the tuner must be working >>> into a 50 ohm load for accurate power readings. If you are connected to >>> an antenna that has a feedpoint impedance other than 50+j0 impedance, you >>> can expect "unexpected" results. >>> When you change the ATU menu to Auto and do a TUNE, the tuner has done >>> its job of providing a 50 ohm match to the K2 and the power out will be as >>> requested. >>> >>> 73, >>> Don W3FPR >>> >>> Tom Campie wrote: >>> >>> >>>> This has been beaten over and over I think but I haven't found >>>> anything on it yet: >>>> >>>> I just got back from the lab at work and used a very well calibrated >>>> power meter to calibrate my KAT2 power meter. Now on 40m at home, I set >>>> my power control to 5w and tuner to Pout. The tuner now reads 2.9w. Not >>>> until I tune the requested power to 8 watts or so does the tuner say I'm >>>> putting out 5 watts. Isn't there a way to adjust it so that the requested >>>> power matches the tuner output power so that the S/ Power meter reads the >>>> right value? That's the most annoying part... >>>> >>>> Tom >>>> ______________________________________________________________ >>>> Elecraft mailing list >>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>>> Help: http://mailman.qth.net/mmfaq.htm >>>> Post: mailto:[hidden email] >>>> >>>> This list hosted by: http://www.qsl.net >>>> Please help support this email list: http://www.qsl.net/donate.html >>>> ------------------------------------------------------------------------ >>>> >>>> >>>> No virus found in this incoming message. >>>> Checked by AVG - www.avg.com Version: 8.5.375 / Virus Database: >>>> 270.13.20/2248 - Release Date: 07/19/09 05:57:00 >>>> >>>> >>>> >>>> >>> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> ------------------------------------------------------------------------ >> >> >> No virus found in this incoming message. >> Checked by AVG - www.avg.com Version: 8.5.375 / Virus Database: >> 270.13.20/2248 - Release Date: 07/19/09 05:57:00 >> >> >> > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Tom,
If the balun was in the circuit when you did the null, the result will be WAY off. The tuner must be looking into a good 50 ohm load when adjusting for the null. 73, Don W3FPR Tom Campie wrote: > I just realized something that may be throwing it off - I installed the > Elecraft 4:1 balun inside the rig and hard wired it to ANT 2 on the tuner > after I'd done the bridge null - is it possible that that has thrown off > that null and I am not actually getting a 50 ohm load to the front end? > I'll have to redo that tonight and report back. > > Thanks for the help so far. > > Tom > > On Sun, Jul 19, 2009 at 11:12 PM, Don Wilhelm <[hidden email]> wrote: > > >> Tom, >> >> That is exactly what I said. In CALP, if the load is anything other than >> 50+j0, the power indication will be incorrect. In other words, the >> requested power may not equal the actual power. >> >> When you go to AUTO and do a TUNE, the forward power should be close to the >> requested power. >> >> >> 73, >> Don W3FPR >> >> Tom Campie wrote: >> >> >>> I calibrated the tuner to a 50 ohm load on CALP. With the tuner tuned to >>> a non-50 Ohm load, the requested power does not match the output power by >>> any definition of the word. >>> >>> Tom >>> >>> On Jul 19, 2009, at 9:48 PM, Don Wilhelm wrote: >>> >>> >>> >>> >>>> Tom, >>>> >>>> No adjustment is required. In CALP state, the tuner must be working >>>> into a 50 ohm load for accurate power readings. If you are connected to >>>> an antenna that has a feedpoint impedance other than 50+j0 impedance, you >>>> can expect "unexpected" results. >>>> When you change the ATU menu to Auto and do a TUNE, the tuner has done >>>> its job of providing a 50 ohm match to the K2 and the power out will be as >>>> requested. >>>> >>>> 73, >>>> Don W3FPR >>>> >>>> Tom Campie wrote: >>>> >>>> >>>> >>>>> This has been beaten over and over I think but I haven't found >>>>> anything on it yet: >>>>> >>>>> I just got back from the lab at work and used a very well calibrated >>>>> power meter to calibrate my KAT2 power meter. Now on 40m at home, I set >>>>> my power control to 5w and tuner to Pout. The tuner now reads 2.9w. Not >>>>> until I tune the requested power to 8 watts or so does the tuner say I'm >>>>> putting out 5 watts. Isn't there a way to adjust it so that the requested >>>>> power matches the tuner output power so that the S/ Power meter reads the >>>>> right value? That's the most annoying part... >>>>> >>>>> Tom >>>>> ______________________________________________________________ >>>>> Elecraft mailing list >>>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>>>> Help: http://mailman.qth.net/mmfaq.htm >>>>> Post: mailto:[hidden email] >>>>> >>>>> This list hosted by: http://www.qsl.net >>>>> Please help support this email list: http://www.qsl.net/donate.html >>>>> ------------------------------------------------------------------------ >>>>> >>>>> >>>>> No virus found in this incoming message. >>>>> Checked by AVG - www.avg.com Version: 8.5.375 / Virus Database: >>>>> 270.13.20/2248 - Release Date: 07/19/09 05:57:00 >>>>> >>>>> >>>>> >>>>> >>>>> >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[hidden email] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> ------------------------------------------------------------------------ >>> >>> >>> No virus found in this incoming message. >>> Checked by AVG - www.avg.com Version: 8.5.375 / Virus Database: >>> 270.13.20/2248 - Release Date: 07/19/09 05:57:00 >>> >>> >>> >>> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.375 / Virus Database: 270.13.20/2250 - Release Date: 07/20/09 06:16:00 > > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by TJ Campie
I redid the C55 null (it was off by quite a bit now) but that did not solve
the problem. I re-initialized the tuner and retuned my non-50 ohm load and my power readings were still way off. Worst on 40m. I'm taking the balun off tonight, we'll see if that makes any difference. If not I guess I'll have to go through and see if I can find any mistakes or errors in the build. Any other ideas? Tom On Mon, Jul 20, 2009 at 9:51 AM, Tom Campie <[hidden email]> wrote: > I just realized something that may be throwing it off - I installed the > Elecraft 4:1 balun inside the rig and hard wired it to ANT 2 on the tuner > after I'd done the bridge null - is it possible that that has thrown off > that null and I am not actually getting a 50 ohm load to the front end? > I'll have to redo that tonight and report back. > > Thanks for the help so far. > > Tom > > > On Sun, Jul 19, 2009 at 11:12 PM, Don Wilhelm <[hidden email]>wrote: > >> Tom, >> >> That is exactly what I said. In CALP, if the load is anything other than >> 50+j0, the power indication will be incorrect. In other words, the >> requested power may not equal the actual power. >> >> When you go to AUTO and do a TUNE, the forward power should be close to >> the requested power. >> >> >> 73, >> Don W3FPR >> >> Tom Campie wrote: >> >>> I calibrated the tuner to a 50 ohm load on CALP. With the tuner tuned >>> to a non-50 Ohm load, the requested power does not match the output power >>> by any definition of the word. >>> >>> Tom >>> >>> On Jul 19, 2009, at 9:48 PM, Don Wilhelm wrote: >>> >>> >>> >>>> Tom, >>>> >>>> No adjustment is required. In CALP state, the tuner must be working >>>> into a 50 ohm load for accurate power readings. If you are connected to >>>> an antenna that has a feedpoint impedance other than 50+j0 impedance, you >>>> can expect "unexpected" results. >>>> When you change the ATU menu to Auto and do a TUNE, the tuner has done >>>> its job of providing a 50 ohm match to the K2 and the power out will be as >>>> requested. >>>> >>>> 73, >>>> Don W3FPR >>>> >>>> Tom Campie wrote: >>>> >>>> >>>>> This has been beaten over and over I think but I haven't found >>>>> anything on it yet: >>>>> >>>>> I just got back from the lab at work and used a very well calibrated >>>>> power meter to calibrate my KAT2 power meter. Now on 40m at home, I set >>>>> my power control to 5w and tuner to Pout. The tuner now reads 2.9w. Not >>>>> until I tune the requested power to 8 watts or so does the tuner say I'm >>>>> putting out 5 watts. Isn't there a way to adjust it so that the requested >>>>> power matches the tuner output power so that the S/ Power meter reads the >>>>> right value? That's the most annoying part... >>>>> >>>>> Tom >>>>> ______________________________________________________________ >>>>> Elecraft mailing list >>>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>>>> Help: http://mailman.qth.net/mmfaq.htm >>>>> Post: mailto:[hidden email] >>>>> >>>>> This list hosted by: http://www.qsl.net >>>>> Please help support this email list: http://www.qsl.net/donate.html >>>>> >>>>> ------------------------------------------------------------------------ >>>>> >>>>> >>>>> No virus found in this incoming message. >>>>> Checked by AVG - www.avg.com Version: 8.5.375 / Virus Database: >>>>> 270.13.20/2248 - Release Date: 07/19/09 05:57:00 >>>>> >>>>> >>>>> >>>>> >>>> >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[hidden email] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> ------------------------------------------------------------------------ >>> >>> >>> No virus found in this incoming message. >>> Checked by AVG - www.avg.com Version: 8.5.375 / Virus Database: >>> 270.13.20/2248 - Release Date: 07/19/09 05:57:00 >>> >>> >>> >> > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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I just thought of another thing: I got the KAT2 almost completely built -
just had to put in one IC and the RAM chip. When I tested the DC voltage on Pin 1 of that IC at the end of the Bridge Null section the voltage was 2.56 V or something, below the spec'd 3-4 volts. I attributed this to the fact that R6 was already installed and just went on. Could that be a clue to the source of my trouble? Should that have read between 3 and 4 volts even with that resistor in there? I'm going to take it out and go through that process again tonight and see where that gets me. Tom W0EA On Jul 20, 2009 12:54pm, Tom Campie <[hidden email]> wrote: > I redid the C55 null (it was off by quite a bit now) but that did not > solve the problem. I re-initialized the tuner and retuned my non-50 ohm > load and my power readings were still way off. Worst on 40m. I'm taking > the balun off tonight, we'll see if that makes any difference. If not I > guess I'll have to go through and see if I can find any mistakes or > errors in the build. Any other ideas? > Tom > On Mon, Jul 20, 2009 at 9:51 AM, Tom Campie [hidden email]> wrote: > I just realized something that may be throwing it off - I installed the > Elecraft 4:1 balun inside the rig and hard wired it to ANT 2 on the tuner > after I'd done the bridge null - is it possible that that has thrown off > that null and I am not actually getting a 50 ohm load to the front end? > I'll have to redo that tonight and report back. > Thanks for the help so far. > Tom > On Sun, Jul 19, 2009 at 11:12 PM, Don Wilhelm [hidden email]> wrote: > Tom, > That is exactly what I said. In CALP, if the load is anything other than > 50+j0, the power indication will be incorrect. In other words, the > requested power may not equal the actual power. > When you go to AUTO and do a TUNE, the forward power should be close to > the requested power. > 73, > Don W3FPR > Tom Campie wrote: > I calibrated the tuner to a 50 ohm load on CALP. With the tuner tuned to > a non-50 Ohm load, the requested power does not match the output power by > any definition of the word. > Tom > On Jul 19, 2009, at 9:48 PM, Don Wilhelm wrote: > Tom, > No adjustment is required. In CALP state, the tuner must be working into > a 50 ohm load for accurate power readings. If you are connected to an > antenna that has a feedpoint impedance other than 50+j0 impedance, you > can expect "unexpected" results. > When you change the ATU menu to Auto and do a TUNE, the tuner has done > its job of providing a 50 ohm match to the K2 and the power out will be > as requested. > 73, > Don W3FPR > Tom Campie wrote: > This has been beaten over and over I think but I haven't found anything > on it yet: > I just got back from the lab at work and used a very well calibrated > power meter to calibrate my KAT2 power meter. Now on 40m at home, I set > my power control to 5w and tuner to Pout. The tuner now reads 2.9w. Not > until I tune the requested power to 8 watts or so does the tuner say I'm > putting out 5 watts. Isn't there a way to adjust it so that the requested > power matches the tuner output power so that the S/ Power meter reads the > right value? That's the most annoying part... > Tom > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ------------------------------------------------------------------------ > No virus found in this incoming message. > Checked by AVG - www.avg.com Version: 8.5.375 / Virus Database: > 270.13.20/2248 - Release Date: 07/19/09 05:57:00 > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ------------------------------------------------------------------------ > No virus found in this incoming message. > Checked by AVG - www.avg.com Version: 8.5.375 / Virus Database: > 270.13.20/2248 - Release Date: 07/19/09 05:57:00 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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