More KAT500 PTT Questions
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Folks,
I am trying to understand the tuning approach taken by the KAT500, specifically how it relates to the PTT line. The KAT500 manual (Rev. A) on page 13 spells out precautions to take when using the KAT500 with a non-Elecraft amplifier. This appears to be necessary to protect some amplifiers from damage, in case the PTT line opens up while the amp is energized and putting out power. Page 5 of the manual states that the key line opens whenever a KAT500 tune operation occurs. So should my concern for non-Elecraft amp damage only relate to band changes, as page 13 implies, or will PTT open whenever the KAT500 senses a high SWR and retunes, even if on the same band? It would be impractical for me to anticipate KAT500 retuning when moving into a new band segment and try to shut down the amp per the procedure on page 13. --Ed-- ______________________________________________________________ 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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Ed,
The KAT500 is not *that* automatic. It will not automatically re-tune even if it senses a high SWR. You must tell it to tune. Once it has been tuned to each antenna and bend segment, returning to that set of tuning parameters is automatic - just go to that frequency and antenna and the proper tuning will be recalled. 73, Don W3FPR On 11/5/2012 3:41 PM, Ed G wrote: > or will PTT open whenever the KAT500 senses a high SWR and retunes, even if > on the same band? It would be impractical for me to anticipate KAT500 > retuning when moving into a new band segment and try to shut down the amp > per the procedure on page 13. > ______________________________________________________________ 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: More KAT500 PTT Questions
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That's not true, Don... the KAT500 *will* auto-tune if/when VSWR
exceeds a (configurable, per-band) threshold. A lot of consideration is being put into different ways of handling "hot-switching" situations with various types of amplifiers. The currently-posted provisional manual may not be reflective of the final result of this consideration..... 73, ~iain / N6ML On Mon, Nov 5, 2012 at 1:18 PM, Don Wilhelm <[hidden email]> wrote: > Ed, > > The KAT500 is not *that* automatic. It will not automatically re-tune > even if it senses a high SWR. You must tell it to tune. Once it has > been tuned to each antenna and bend segment, returning to that set of > tuning parameters is automatic - just go to that frequency and antenna > and the proper tuning will be recalled. > > 73, > Don W3FPR > > On 11/5/2012 3:41 PM, Ed G wrote: >> or will PTT open whenever the KAT500 senses a high SWR and retunes, even if >> on the same band? It would be impractical for me to anticipate KAT500 >> retuning when moving into a new band segment and try to shut down the amp >> per the procedure on page 13. >> > > ______________________________________________________________ > 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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OK, that is a revelation to me. Sorry that I did not read that in the
manual. I stand down in light of more informed designers and testers.. 73, Don W3FPR On 11/5/2012 4:31 PM, iain macdonnell - N6ML wrote: > That's not true, Don... the KAT500 *will* auto-tune if/when VSWR > exceeds a (configurable, per-band) threshold. > > A lot of consideration is being put into different ways of handling > "hot-switching" situations with various types of amplifiers. The > currently-posted provisional manual may not be reflective of the final > result of this consideration..... > > 73, > > ~iain / N6ML > > > > On Mon, Nov 5, 2012 at 1:18 PM, Don Wilhelm <[hidden email]> wrote: >> Ed, >> >> The KAT500 is not *that* automatic. It will not automatically re-tune >> even if it senses a high SWR. You must tell it to tune. Once it has >> been tuned to each antenna and bend segment, returning to that set of >> tuning parameters is automatic - just go to that frequency and antenna >> and the proper tuning will be recalled. >> >> 73, >> Don W3FPR >> >> On 11/5/2012 3:41 PM, Ed G wrote: >>> or will PTT open whenever the KAT500 senses a high SWR and retunes, even if >>> on the same band? It would be impractical for me to anticipate KAT500 >>> retuning when moving into a new band segment and try to shut down the amp >>> per the procedure on page 13. >>> >> ______________________________________________________________ >> 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 > ______________________________________________________________ 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: More KAT500 PTT Questions
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Well, it does actually say this in the manual:
"In AUTO mode, if you QSY such that the SWR rises above 1.8:1 the KAT500 will automatically retune when you transmit on the new frequency. The KAT500 will open the key line to disable your amplifier briefly until the tune cycle is completed. The new frequency and settings are stored in memory." That 1.8:1 threshold is configurable, per-band ... and the opening of the keying line during auto-tune is the part that can be problematic for some types of amplifier, so further conditions are being considered.... 73, ~iain / N6ML On Mon, Nov 5, 2012 at 1:59 PM, Don Wilhelm <[hidden email]> wrote: > OK, that is a revelation to me. Sorry that I did not read that in the > manual. > I stand down in light of more informed designers and testers.. > > 73, > Don W3FPR > > On 11/5/2012 4:31 PM, iain macdonnell - N6ML wrote: >> That's not true, Don... the KAT500 *will* auto-tune if/when VSWR >> exceeds a (configurable, per-band) threshold. >> >> A lot of consideration is being put into different ways of handling >> "hot-switching" situations with various types of amplifiers. The >> currently-posted provisional manual may not be reflective of the final >> result of this consideration..... >> >> 73, >> >> ~iain / N6ML >> >> >> >> On Mon, Nov 5, 2012 at 1:18 PM, Don Wilhelm <[hidden email]> wrote: >>> Ed, >>> >>> The KAT500 is not *that* automatic. It will not automatically re-tune >>> even if it senses a high SWR. You must tell it to tune. Once it has >>> been tuned to each antenna and bend segment, returning to that set of >>> tuning parameters is automatic - just go to that frequency and antenna >>> and the proper tuning will be recalled. >>> >>> 73, >>> Don W3FPR >>> >>> On 11/5/2012 3:41 PM, Ed G wrote: >>>> or will PTT open whenever the KAT500 senses a high SWR and retunes, even if >>>> on the same band? It would be impractical for me to anticipate KAT500 >>>> retuning when moving into a new band segment and try to shut down the amp >>>> per the procedure on page 13. >>>> >>> ______________________________________________________________ >>> 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 >> > > ______________________________________________________________ > 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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