K3: incrementing Power level
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Well, if this can be a user selection fine. But I really like the
"tiny steps" below 12 watts. Please retain that. Thanks, de Doug KR2Q ______________________________________________________________ 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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DOUGLAS ZWIEBEL wrote:
>Well, if this can be a user selection fine. But I really like the >"tiny steps" below 12 watts. Please retain that. If this area of code is to be revisited, the gap in available power settings on 50MHz also needs to be addressed. The maximum available power without the KPA3 is 8W on 50MHz, but the minimum available power with the KPA3 activates is about 13W - a jump of more than 60%. This isn't important when the K3 is operating barefoot... but with some power amplifiers, in some countries, the legal power limit falls right into the hole. -- 73 from Ian GM3SEK ______________________________________________________________ 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: incrementing Power level
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Ian, > If this area of code is to be revisited, the gap in available power > settings on 50MHz also needs to be addressed. > > The maximum available power without the KPA3 is 8W on 50MHz, but the > minimum available power with the KPA3 activates is about 13W > - a jump of more than 60%. The "gap" is not a matter of code, it is a matter of the power available from the LPA on six meters. The LPA can not make more than about 8 watts and stay "clean." However, the gain (ca. 12 dB) of the HPA is such that 13W is a minimum practical output. This leaves the gap. If the external 50 MHz amplifier needs only 10 W for full output (e.g., a grid driven tetrode) additional grid swamping on an attenuator would be a wise investment. 73, ... Joe, W4TV > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of Ian > White GM3SEK > Sent: Monday, December 07, 2009 1:39 PM > To: [hidden email] > Subject: Re: [Elecraft] K3: incrementing Power level > > > DOUGLAS ZWIEBEL wrote: > >Well, if this can be a user selection fine. But I really like the > >"tiny steps" below 12 watts. Please retain that. > > If this area of code is to be revisited, the gap in available power > settings on 50MHz also needs to be addressed. > > The maximum available power without the KPA3 is 8W on 50MHz, but the > minimum available power with the KPA3 activates is about 13W > - a jump of > more than 60%. > > This isn't important when the K3 is operating barefoot... but > with some > power amplifiers, in some countries, the legal power limit > falls right > into the hole. > > > > -- > > 73 from Ian GM3SEK > ______________________________________________________________ > 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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Joe Subich, W4TV wrote:
> >Ian, > >> If this area of code is to be revisited, the gap in available power >> settings on 50MHz also needs to be addressed. >> >> The maximum available power without the KPA3 is 8W on 50MHz, but the >> minimum available power with the KPA3 activates is about 13W >> - a jump of more than 60%. > >The "gap" is not a matter of code, it is a matter of the power >available from the LPA on six meters. The LPA can not make more >than about 8 watts and stay "clean." However, the gain (ca. 12 dB) >of the HPA is such that 13W is a minimum practical output. This >leaves the gap. > Only the lower end of the gap, 8W, is a hardware limitation. The upper end of the gap, 13W, is set by DSP. On 1.8-30MHz the KPA3 comes online above 12W. The excitation level is automatically reduced in DSP (by ca. 12dB, equal to the gain of the KPA3) so that the next notch of the PWR control will be a smooth transition from 12W to 13W. Then the excitation level is ramped up again to cover the 'high' power range from 13 to 100W. The only thing wrong with 50MHz is that the 'high' power range appears to be using the same code as the lower bands. Nobody outside Elecraft knows how easy or difficult it would be to change the excitation levels for 50MHz to bring the next available step down to 9W... hence the respectful request to see if this problem can be addressed. >If the external 50 MHz amplifier needs only 10 W for full output >(e.g., a grid driven tetrode) additional grid swamping on an >attenuator would be a wise investment. > That statement is only valid for some people's amplifiers and some countries' power limits. But regardless of all that, modifying the amplifier would be a clumsy external patch for a problem that resides strictly in the transceiver. The real issue is that a gap of 60% in the available power level, from any transmitter, on any band, simply ain't elegant. 73 from Ian GM3SEK >> -----Original Message----- >> From: [hidden email] >> [mailto:[hidden email]] On Behalf Of Ian >> White GM3SEK >> Sent: Monday, December 07, 2009 1:39 PM >> To: [hidden email] >> Subject: Re: [Elecraft] K3: incrementing Power level >> >> >> DOUGLAS ZWIEBEL wrote: >> >Well, if this can be a user selection fine. But I really like the >> >"tiny steps" below 12 watts. Please retain that. >> >> If this area of code is to be revisited, the gap in available power >> settings on 50MHz also needs to be addressed. >> >> The maximum available power without the KPA3 is 8W on 50MHz, but the >> minimum available power with the KPA3 activates is about 13W >> - a jump of >> more than 60%. >> >> This isn't important when the K3 is operating barefoot... but >> with some >> power amplifiers, in some countries, the legal power limit >> falls right >> into the hole. >> >> >> >> -- >> >> 73 from Ian GM3SEK >> ______________________________________________________________ >> 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: incrementing Power level
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This is on my firmware list.
Wayne ---- http://www.elecraft.com On Dec 7, 2009, at 1:25 PM, Ian White GM3SEK <[hidden email]> wrote: > Joe Subich, W4TV wrote: >> >> Ian, >> >>> If this area of code is to be revisited, the gap in available power >>> settings on 50MHz also needs to be addressed. >>> >>> The maximum available power without the KPA3 is 8W on 50MHz, but the >>> minimum available power with the KPA3 activates is about 13W >>> - a jump of more than 60%. >> >> The "gap" is not a matter of code, it is a matter of the power >> available from the LPA on six meters. The LPA can not make more >> than about 8 watts and stay "clean." However, the gain (ca. 12 dB) >> of the HPA is such that 13W is a minimum practical output. This >> leaves the gap. >> > > Only the lower end of the gap, 8W, is a hardware limitation. The upper > end of the gap, 13W, is set by DSP. 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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Wayne Burdick wrote:
>>>> If this area of code is to be revisited, the gap in available power >>>> settings on 50MHz also needs to be addressed. >This is on my firmware list. Thank you, that's what I was hoping to hear. -- 73 from Ian GM3SEK ______________________________________________________________ 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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