Narrow Digital Modes ??
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Could Elecraft explain why the KX2 design doesn't allow operating say JT65 out of the box?
What prohibits manufacturing the rig to do the narrow digital modes? Would be helpful to know Thanks Dan VA3MA I notice Wayne is ignoring explaining their design decision - commenting on all other questions ! ______________________________________________________________ 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 Message delivered to [hidden email] |
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Dan,
I cannot speak for Elecraft, but I suspect I know the answer. In my opinion, the issue is frequency stability; the narrower the bandwidth the more frequency stability is required. Frequency stability is frequently accomplished with a crystal oven, to keep the oscillator spot on. Heat eats power, so it may not be a compatible design objective for a QRP rig. just my thoughts on it... 73 de Dave, W5SV On 5/24/16 10:27, Dan - VA3MA wrote: > Could Elecraft explain why the KX2 design doesn't allow operating say JT65 out of the box? > What prohibits manufacturing the rig to do the narrow digital modes? > Would be helpful to know > Thanks > Dan VA3MA > > I notice Wayne is ignoring explaining their design decision - commenting on all other questions ! > ______________________________________________________________ ______________________________________________________________ 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 Message delivered to [hidden email] |
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In reply to this post by VA3MA
I reviewed the KX2 FAQ before replying and actually one can connect
an external computer to the KX2 and audio can be connected via headphone and ext mic connectors and PTT via the computer connection, so I would guess that freq stability might be the reason. One cannot connect to external SDR programs as IQ baseband access is not provided like the KX3 (BTW that is not provided in the K3, ether but WSJT10 and probably JT65HF work off ordinary speaker audio into a soundcard). I can run either WSJT10 using my K3 LINE OUT or MAP65 using a LP-Pan (SDR) on the first IF. LP-Pan provides IQ baseband audio for computer based SDR programs. Someone needs to run a test of freq.stability on the KX2 running about 3w output in CW, holding key-down for 50-seconds followed by Rx for 70-seconds to simulate JT65 heating and thus frequency stress. IF 28-MHz holds under 20-Hz drift over at least ten minutes than it is compatible for JT65; if not then that may be the issue. Let me say my KX3's features suit my use(s) of the radio better. I like having 6m & 2M internal to the radio. Recently had opportunity to use the KX3-2M as base radio for my weekly 2m SSB Net and its receiving ability with 214-foot of coax cable from my four yagi eme array worked surprisingly well (normally I use tower mounted preamps). 73, Ed - KL7UW Date: Tue, 24 May 2016 08:57:27 -0400 From: Dan - VA3MA <[hidden email]> To: Elecraft <[hidden email]> Subject: [Elecraft] Narrow Digital Modes ?? Message-ID: <[hidden email]> Content-Type: text/plain; charset=us-ascii Could Elecraft explain why the KX2 design doesn't allow operating say JT65 out of the box? What prohibits manufacturing the rig to do the narrow digital modes? Would be helpful to know Thanks Dan VA3MA 73, Ed - KL7UW http://www.kl7uw.com "Kits made by KL7UW" Dubus Mag business: [hidden email] ______________________________________________________________ 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 Message delivered to [hidden email] |
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I am uncertain why the OP claims the KX2 is not usable on JT65. One of the
KX2 field testers operated the radio on that mode without issues and reported the same in an eham review of the KX2. In fact, we paid great attention to frequency stability in the KX2 design, applying lessons learned from the KX3. The KX2 Tx power is more limited than in the KX3. But JT65 is a weak signal mode :-) 73, Lyle KK7P On Tue, May 24, 2016 at 9:46 AM, Edward R Cole <[hidden email]> wrote: > I reviewed the KX2 FAQ before replying and actually one can connect an > external computer to the KX2 and audio can be connected via headphone and > ext mic connectors and PTT via the computer connection, so I would guess > that freq stability might be the reason. > > One cannot connect to external SDR programs as IQ baseband access is not > provided like the KX3 (BTW that is not provided in the K3, ether but WSJT10 > and probably JT65HF work off ordinary speaker audio into a soundcard). > > I can run either WSJT10 using my K3 LINE OUT or MAP65 using a LP-Pan (SDR) > on the first IF. LP-Pan provides IQ baseband audio for computer based SDR > programs. > > Someone needs to run a test of freq.stability on the KX2 running about 3w > output in CW, holding key-down for 50-seconds followed by Rx for 70-seconds > to simulate JT65 heating and thus frequency stress. IF 28-MHz holds under > 20-Hz drift over at least ten minutes than it is compatible for JT65; if > not then that may be the issue. > > Let me say my KX3's features suit my use(s) of the radio better. I like > having 6m & 2M internal to the radio. Recently had opportunity to use the > KX3-2M as base radio for my weekly 2m SSB Net and its receiving ability > with 214-foot of coax cable from my four yagi eme array worked surprisingly > well (normally I use tower mounted preamps). > > 73, Ed - KL7UW > > Date: Tue, 24 May 2016 08:57:27 -0400 > From: Dan - VA3MA <[hidden email]> > To: Elecraft <[hidden email]> > Subject: [Elecraft] Narrow Digital Modes ?? > Message-ID: <[hidden email]> > Content-Type: text/plain; charset=us-ascii > > Could Elecraft explain why the KX2 design doesn't allow operating say JT65 > out of the box? > What prohibits manufacturing the rig to do the narrow digital modes? > Would be helpful to know > Thanks > Dan VA3MA > > > > 73, Ed - KL7UW > http://www.kl7uw.com > "Kits made by KL7UW" > Dubus Mag business: > [hidden email] > > > ______________________________________________________________ > 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 > Message delivered to [hidden email] > 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 Message delivered to [hidden email] |
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Lyle
This is very encouraging ! My friend Terry VE3EGA is awaiting delivery of his KX2 I think he will try using it onJT9 And let me know... HOPE SO On 2016-05-24, at 13:18, Lyle Johnson <[hidden email]> wrote: I am uncertain why the OP claims the KX2 is not usable on JT65. One of the KX2 field testers operated the radio on that mode without issues and reported the same in an eham review of the KX2. In fact, we paid great attention to frequency stability in the KX2 design, applying lessons learned from the KX3. The KX2 Tx power is more limited than in the KX3. But JT65 is a weak signal mode :-) 73, Lyle KK7P On Tue, May 24, 2016 at 9:46 AM, Edward R Cole <[hidden email]> wrote: > I reviewed the KX2 FAQ before replying and actually one can connect an > external computer to the KX2 and audio can be connected via headphone and > ext mic connectors and PTT via the computer connection, so I would guess > that freq stability might be the reason. > > One cannot connect to external SDR programs as IQ baseband access is not > provided like the KX3 (BTW that is not provided in the K3, ether but WSJT10 > and probably JT65HF work off ordinary speaker audio into a soundcard). > > I can run either WSJT10 using my K3 LINE OUT or MAP65 using a LP-Pan (SDR) > on the first IF. LP-Pan provides IQ baseband audio for computer based SDR > programs. > > Someone needs to run a test of freq.stability on the KX2 running about 3w > output in CW, holding key-down for 50-seconds followed by Rx for 70-seconds > to simulate JT65 heating and thus frequency stress. IF 28-MHz holds under > 20-Hz drift over at least ten minutes than it is compatible for JT65; if > not then that may be the issue. > > Let me say my KX3's features suit my use(s) of the radio better. I like > having 6m & 2M internal to the radio. Recently had opportunity to use the > KX3-2M as base radio for my weekly 2m SSB Net and its receiving ability > with 214-foot of coax cable from my four yagi eme array worked surprisingly > well (normally I use tower mounted preamps). > > 73, Ed - KL7UW > > Date: Tue, 24 May 2016 08:57:27 -0400 > From: Dan - VA3MA <[hidden email]> > To: Elecraft <[hidden email]> > Subject: [Elecraft] Narrow Digital Modes ?? > Message-ID: <[hidden email]> > Content-Type: text/plain; charset=us-ascii > > Could Elecraft explain why the KX2 design doesn't allow operating say JT65 > out of the box? > What prohibits manufacturing the rig to do the narrow digital modes? > Would be helpful to know > Thanks > Dan VA3MA > > > > 73, Ed - KL7UW > http://www.kl7uw.com > "Kits made by KL7UW" > Dubus Mag business: > [hidden email] > > > ______________________________________________________________ > 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 > Message delivered to [hidden email] 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 Message delivered to [hidden email] ______________________________________________________________ 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 Message delivered to [hidden email] |
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In reply to this post by VA3MA
I've been successfully running JT-65, WSPR this weekend on my KX2 @ 2.6 Watts and monitoring the PA temp on the VFO B display. The ambient temp in the shack was about 21C, at the end of the WSPR Tx cycles the PA Temp gets up to about 58C. (20m, 30m, 40m frequency does not seem to matter). Look for kc1ccr on WSPRnet.
Rant: I want to go /p or /m QRP digital modes. I don't particularly mind hauling my phone/tablet/Macbook air around /p /m or /pm. Not a fan of CW, and I am definitely not gen-x. PA Engineering/Howie make us a KX2 heatsink already! 73 de kc1ccr Date: Tue, 24 May 2016 19:28:18 -0400 From: Dan - VA3MA <[hidden email]> To: Lyle Johnson <[hidden email]> Cc: "[hidden email]" <[hidden email]>, Terry Bennett <[hidden email]> Subject: Re: [Elecraft] Narrow Digital Modes ?? Message-ID: <[hidden email]> Content-Type: text/plain; charset=us-ascii Lyle This is very encouraging ! My friend Terry VE3EGA is awaiting delivery of his KX2 I think he will try using it onJT9 And let me know... HOPE SO On 2016-05-24, at 13:18, Lyle Johnson <[hidden email]> wrote: I am uncertain why the OP claims the KX2 is not usable on JT65. One of the KX2 field testers operated the radio on that mode without issues and reported the same in an eham review of the KX2. In fact, we paid great attention to frequency stability in the KX2 design, applying lessons learned from the KX3. The KX2 Tx power is more limited than in the KX3. But JT65 is a weak signal mode :-) ______________________________________________________________ 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 Message delivered to [hidden email] |
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