K3 TUNE function
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Given that the transmitter gain calibration involves holding TUNE at 5w and 50w on each band (either manually or via the utility), why does holding TUNE at any other power level on any band not upset the tx gain calibration for that band? Or does it?
73 to all Geoff G3UCK ______________________________________________________________ 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 |
Re: K3 TUNE function
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On Mon, Nov 12, 2012 at 1:37 PM, Geoffrey Downs
<[hidden email]> wrote: > Given that the transmitter gain calibration involves holding TUNE at 5w and 50w on each band (either manually or via the utility), why does holding TUNE at any other power level on any band not upset the tx gain calibration for that band? Or does it? Good question... Since the procedure requires power to be set to exactly 5.0W, it suggests that there's some special logic in the firmware that cause the calibration routine to kick in when TUNE is invoked with that setting. That seems to imply that one should not invoke the TUNE function at that power level under other circumstances, as an imperfect load could result in "decalibration".... 73, ~iain / N6ML ______________________________________________________________ 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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From the manual:
Most calibration procedures use Tech-Mode menu entries. To enable these, set CONFIG:TECH MD to ON. Set TECH MD to OFF afterward. So if Tech mode is off I don't think the Tune button should not have any effect on the Calibration. On 11/12/2012 15:46 PM, iain macdonnell - N6ML wrote: > On Mon, Nov 12, 2012 at 1:37 PM, Geoffrey Downs > <[hidden email]> wrote: >> Given that the transmitter gain calibration involves holding TUNE at 5w and 50w on each band (either manually or via the utility), why does holding TUNE at any other power level on any band not upset the tx gain calibration for that band? Or does it? > Good question... Since the procedure requires power to be set to > exactly 5.0W, it suggests that there's some special logic in the > firmware that cause the calibration routine to kick in when TUNE is > invoked with that setting. That seems to imply that one should not > invoke the TUNE function at that power level under other > circumstances, as an imperfect load could result in > "decalibration".... > > 73, > > ~iain / N6ML > ______________________________________________________________ > 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 |
Re: K3 TUNE function
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Hmm, I'm not sure that's a reasonable assumption - the manual is
telling you that there are some menu items that you'll need for some calibration procedures that are only accessible in "tech mode", but that doesn't necessarily mean that the calibration logic is linked to "tech mode" - it may be; I just would make the assumption...... 73, ~iain / N6ML On Mon, Nov 12, 2012 at 2:18 PM, Gary Mohrlant <[hidden email]> wrote: > From the manual: > > > Most calibration procedures use Tech-Mode menu > entries. To enable these, set CONFIG:TECH MD > to ON. Set TECH MD to OFF afterward. > > > So if Tech mode is off I don't think the Tune button should not have any > effect on the Calibration. > > > > > > > > > > > > On 11/12/2012 15:46 PM, iain macdonnell - N6ML wrote: >> >> On Mon, Nov 12, 2012 at 1:37 PM, Geoffrey Downs >> <[hidden email]> wrote: >>> >>> Given that the transmitter gain calibration involves holding TUNE at 5w >>> and 50w on each band (either manually or via the utility), why does holding >>> TUNE at any other power level on any band not upset the tx gain calibration >>> for that band? Or does it? >> >> Good question... Since the procedure requires power to be set to >> exactly 5.0W, it suggests that there's some special logic in the >> firmware that cause the calibration routine to kick in when TUNE is >> invoked with that setting. That seems to imply that one should not >> invoke the TUNE function at that power level under other >> circumstances, as an imperfect load could result in >> "decalibration".... >> >> 73, >> >> ~iain / N6ML >> ______________________________________________________________ >> 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 Geoffrey Downs-3
Geoff,
I believe the key to your question is found in the menu explanation for the TXGN menu entry. From that description, I conclude that the "magic" is in having the power setting at 5, 50 or 1.0 mW. The gain constant is only updated when Tune function is activated and one of those 3 power levels is set. At other power levels, the gain constant is not updated. 73, Don W3FPR On 11/12/2012 4:37 PM, Geoffrey Downs wrote: > Given that the transmitter gain calibration involves holding TUNE at 5w and 50w on each band (either manually or via the utility), why does holding TUNE at any other power level on any band not upset the tx gain calibration for that band? Or does it? > > ______________________________________________________________ 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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Don, many thanks. That looks like the right explanation. I hadn't spotted it
in the manual. 73 Geoff G3UCK -----Original Message----- From: Don Wilhelm Geoff, I believe the key to your question is found in the menu explanation for the TXGN menu entry. >From that description, I conclude that the "magic" is in having the power setting at 5, 50 or 1.0 mW. The gain constant is only updated when Tune function is activated and one of those 3 power levels is set. At other power levels, the gain constant is not updated. 73, Don W3FPR ______________________________________________________________ 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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