Problems with Power Output
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I do not believe there is anything wrong with either K2s or K3s that do not
put out a full 100 watts on the first SSB syllable. I have built two K2s and two K3s, and the ALC action is very similar on all of them. Save your time trying to do another transmit calibration. I don't think it will solve anything. If it ain't broke, don't fix it! Roy W4WFB ______________________________________________________________ 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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What Roy says is true. The K2 and K3 use a closed control loop to
adjust power output. It starts out at low power after a power on or a band change or a change in the power requested - the actual output power is measured and compared to the power requested, and the drive is adjusted until the two match. It does not take long to come up to the requested power level, but it will not be with the first dit on CW nor the first few syllables on SSB. 73, Don W3FPR On 6/2/2012 11:01 AM, Roy Morris wrote: > I do not believe there is anything wrong with either K2s or K3s that do not > put out a full 100 watts on the first SSB syllable. I have built two K2s > and two K3s, and the ALC action is very similar on all of them. Save your > time trying to do another transmit calibration. I don't think it will solve > anything. If it ain't broke, don't fix it! Roy W4WFB > ______________________________________________________________ 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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Guys,
I may be imagining things, but this effect seems to always be there with my K3. My perception is that it is not just limited after band changes or power level changes. It is especially evident when running a big amp that has a fast display of output power. Where it may matter is in contesting. You want them to copy the first letter of your call right the first time. You want the first dit/dah to be loud. Yes, my K3 has been through the RF power calibration. I'm going to have to look closer at this. 73 de Brian/K3KO On 6/2/2012 15:08, Don Wilhelm wrote: > What Roy says is true. The K2 and K3 use a closed control loop to > adjust power output. It starts out at low power after a power on or a > band change or a change in the power requested - the actual output power > is measured and compared to the power requested, and the drive is > adjusted until the two match. > It does not take long to come up to the requested power level, but it > will not be with the first dit on CW nor the first few syllables on SSB. > > 73, > Don W3FPR > > On 6/2/2012 11:01 AM, Roy Morris wrote: >> I do not believe there is anything wrong with either K2s or K3s that do not >> put out a full 100 watts on the first SSB syllable. I have built two K2s >> and two K3s, and the ALC action is very similar on all of them. Save your >> time trying to do another transmit calibration. I don't think it will solve >> anything. If it ain't broke, don't fix it! Roy W4WFB >> ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.2178 / Virus Database: 2425/5039 - Release Date: 06/01/12 ______________________________________________________________ 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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My experience is that once the power has been managed as Don say's, there is no more ramp-up. I use only CW and after the ramp-up the first dit is at full output. I'm using the KPA500 here. Amateur Radio Operator N5GE ARRL Lifetime Member QCWA Lifetime Member On Sat, 02 Jun 2012 15:21:31 +0000, Brian Alsop <[hidden email]> wrote: >Guys, > >I may be imagining things, but this effect seems to always be there with >my K3. My perception is that it is not just limited after band changes >or power level changes. It is especially evident when running a big amp >that has a fast display of output power. > >Where it may matter is in contesting. You want them to copy the first >letter of your call right the first time. You want the first dit/dah to >be loud. > >Yes, my K3 has been through the RF power calibration. > >I'm going to have to look closer at this. > >73 de Brian/K3KO > > > >On 6/2/2012 15:08, Don Wilhelm wrote: >> What Roy says is true. The K2 and K3 use a closed control loop to >> adjust power output. It starts out at low power after a power on or a >> band change or a change in the power requested - the actual output power >> is measured and compared to the power requested, and the drive is >> adjusted until the two match. >> It does not take long to come up to the requested power level, but it >> will not be with the first dit on CW nor the first few syllables on SSB. >> >> 73, >> Don W3FPR >> >> On 6/2/2012 11:01 AM, Roy Morris wrote: >>> I do not believe there is anything wrong with either K2s or K3s that do not >>> put out a full 100 watts on the first SSB syllable. I have built two K2s >>> and two K3s, and the ALC action is very similar on all of them. Save your >>> time trying to do another transmit calibration. I don't think it will solve >>> anything. If it ain't broke, don't fix it! Roy W4WFB >>> > > >----- >No virus found in this message. >Checked by AVG - www.avg.com >Version: 2012.0.2178 / Virus Database: 2425/5039 - Release Date: 06/01/12 > >______________________________________________________________ >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 ______________________________________________________________ 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 alsopb
Hi Brian,
The problem you described after band changes or power level changes is ABSOLUTELY a function of the TX gain setting. But the automatic setup through the K3 utility might not solve the problem for you. In that case you have to do a manual adjust. I had to do this on two bands for my amplifier. You can review the manual setting procedure at the top of page 62 in the K3 manual in the CONFIG:TXGN area of the configuration summary. You have to first turn off CONFIG:TX ALC before you can make the manual adjustment. Don't forget to turn it back on. 73, Mike K2MK
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In reply to this post by N5GE-2
You may be right. I do lots of S&P which more often than not includes a
band change. Perhaps it is the band change effect I'm seeing. 73 de Brian/K3KO On 6/2/2012 15:48, N5GE wrote: > > My experience is that once the power has been managed as Don say's, there is no > more ramp-up. I use only CW and after the ramp-up the first dit is at full > output. > > I'm using the KPA500 here. > > Amateur Radio Operator N5GE > ARRL Lifetime Member > QCWA Lifetime Member > > On Sat, 02 Jun 2012 15:21:31 +0000, Brian Alsop<[hidden email]> wrote: > >> Guys, >> >> I may be imagining things, but this effect seems to always be there with >> my K3. My perception is that it is not just limited after band changes >> or power level changes. It is especially evident when running a big amp >> that has a fast display of output power. >> >> Where it may matter is in contesting. You want them to copy the first >> letter of your call right the first time. You want the first dit/dah to >> be loud. >> >> Yes, my K3 has been through the RF power calibration. >> >> I'm going to have to look closer at this. >> >> 73 de Brian/K3KO >> >> >> >> On 6/2/2012 15:08, Don Wilhelm wrote: >>> What Roy says is true. The K2 and K3 use a closed control loop to >>> adjust power output. It starts out at low power after a power on or a >>> band change or a change in the power requested - the actual output power >>> is measured and compared to the power requested, and the drive is >>> adjusted until the two match. >>> It does not take long to come up to the requested power level, but it >>> will not be with the first dit on CW nor the first few syllables on SSB. >>> >>> 73, >>> Don W3FPR >>> >>> On 6/2/2012 11:01 AM, Roy Morris wrote: >>>> I do not believe there is anything wrong with either K2s or K3s that do not >>>> put out a full 100 watts on the first SSB syllable. I have built two K2s >>>> and two K3s, and the ALC action is very similar on all of them. Save your >>>> time trying to do another transmit calibration. I don't think it will solve >>>> anything. If it ain't broke, don't fix it! Roy W4WFB >>>> >> >> >> ----- >> No virus found in this message. >> Checked by AVG - www.avg.com >> Version: 2012.0.2178 / Virus Database: 2425/5039 - Release Date: 06/01/12 >> >> ______________________________________________________________ >> 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 > > ______________________________________________________________ > 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 message. > Checked by AVG - www.avg.com > Version: 2012.0.2178 / Virus Database: 2425/5039 - Release Date: 06/01/12 > > ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.2178 / Virus Database: 2425/5039 - Release Date: 06/01/12 ______________________________________________________________ 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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Brian e al,
I too believe that is the case, because I have noticed that when I change bands the ramp up occurs. When that occurs I send DE N5GE QRL ? and after that I get full output. This is especially noticeable on the MARS frequencies I operate on. Amateur Radio Operator N5GE ARRL Lifetime Member QCWA Lifetime Member On Sat, 02 Jun 2012 15:54:18 +0000, Brian Alsop <[hidden email]> wrote: >You may be right. I do lots of S&P which more often than not includes a >band change. Perhaps it is the band change effect I'm seeing. > >73 de Brian/K3KO > >On 6/2/2012 15:48, N5GE wrote: >> >> My experience is that once the power has been managed as Don say's, there is no >> more ramp-up. I use only CW and after the ramp-up the first dit is at full >> output. >> >> I'm using the KPA500 here. >> >> Amateur Radio Operator N5GE >> ARRL Lifetime Member >> QCWA Lifetime Member >> ______________________________________________________________ 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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