K3 on 500 kHz
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Hello k3 Nabblers,
I was happy surprized that now in The Netherlands we are also allowed to use 501 - 504 kHz in an experimental phase. As ex Radio Officer it has been around 25 years ago since my last transmission in this band! I was happy to discover that my K3 is very ok for receive on 500 kHz. For transmitting the 0,5 mW on the transperter output needs some work. We are allowed here to transmit with 5 W EIRP so i think i can use some output power in order to radiate this amount of power in a relatively short antenna. Who has made an amplifier for 500 kHz including ant switching circuit? I am very interested in a design that i can copy and build myself. Maybe also the team of Elecraft is working on something, however seen how busy they are with other things i dont think this has priority. Who can tell me their experience with the K3 on 500? Many thanks and a wonderful 2010 Dick PA3CW |
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Hello Dick,
I was immediately thinking of you when 500kc permission in NL got through, it must feel very special to key-down on your old band :-) A good option for 500kc is the Juma kit: http://www.nikkemedia.fi/juma-tx500/ With a few mods (extra i/o's) it might be an elegant solution with the K3. Happy 2010! 73' Paul PD0PSB
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Another link: http://www.w1vd.com/137-500KWTX.html
Wes N7WS --- On Sun, 1/3/10, pd0psb <[hidden email]> wrote: From: pd0psb <[hidden email]> Subject: Re: [Elecraft] [K3] K3 on 500 kHz To: [hidden email] Date: Sunday, January 3, 2010, 6:35 AM Hello Dick, I was immediately thinking of you when 500kc permission in NL got through, it must feel very special to key-down on your old band :-) A good option for 500kc is the Juma kit: http://www.nikkemedia.fi/juma-tx500/ With a few mods (extra i/o's) it might be an elegant solution with the K3. Happy 2010! 73' Paul PD0PSB PA3CW wrote: > > Hello k3 Nabblers, > > I was happy surprized that now in The Netherlands we are also allowed to > use 501 - 504 kHz in an experimental phase. As ex Radio Officer it has > been around 25 years ago since my last transmission in this band! I was > happy to discover that my K3 is very ok for receive on 500 kHz. For > transmitting the 0,5 mW on the transperter output needs some work. We are > allowed here to transmit with 5 W EIRP so i think i can use some output > power in order to radiate this amount of power in a relatively short > antenna. Who has made an amplifier for 500 kHz including ant switching > circuit? I am very interested in a design that i can copy and build > myself. Maybe also the team of Elecraft is working on something, however > seen how busy they are with other things i dont think this has priority. > Who can tell me their experience with the K3 on 500? > > Many thanks and a wonderful 2010 > Dick PA3CW > > ______________________________________________________________ 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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This one will certainly be able to deliver 5W EIRP, Wes :-)
Nice design! 73' Paul PD0PSB <quote author="Wes Stewart"> Another link: http://www.w1vd.com/137-500KWTX.html Wes N7WS A good option for 500kc is the Juma kit: http://www.nikkemedia.fi/juma-tx500/ With a few mods (extra i/o's) it might be an elegant solution with the K3. |
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In reply to this post by n7ws
The thing to watch with class D amps is that the Keying waveform will be
significantly modified (Rise and fall Times) and this could lead to keyclicks by distorting the K3's keying waveform . Mostly Class D amps are keyed at the Finals for this reason. I am using my K3 on 500KHz in conjunction with an old NDB amplifier. this AMP was low level Carrier + sideband followed by linear PA stages to 100W. I use it as a linear for my K3 Do take special care to protect the Transverter RX input to the K3 if operating on 500 KHz as it's not as comprehensively protected from strong signals as the the RX antenna input 73 Brendan EI6IZ (some of us in EI are on 501 -504 KHz ) On Sun, 2010-01-03 at 06:38 -0800, Wes Stewart wrote: > Another link: http://www.w1vd.com/137-500KWTX.html > > Wes N7WS > > --- On Sun, 1/3/10, pd0psb <[hidden email]> wrote: > > From: pd0psb <[hidden email]> > Subject: Re: [Elecraft] [K3] K3 on 500 kHz > To: [hidden email] > Date: Sunday, January 3, 2010, 6:35 AM > > > Hello Dick, > > I was immediately thinking of you when 500kc permission in NL got through, > it must feel very special to key-down on your old band :-) > > A good option for 500kc is the Juma kit: > http://www.nikkemedia.fi/juma-tx500/ > > With a few mods (extra i/o's) it might be an elegant solution with the K3. > > Happy 2010! > 73' > Paul > PD0PSB > > > > > PA3CW wrote: > > > > Hello k3 Nabblers, > > > > I was happy surprized that now in The Netherlands we are also allowed to > > use 501 - 504 kHz in an experimental phase. As ex Radio Officer it has > > been around 25 years ago since my last transmission in this band! I was > > happy to discover that my K3 is very ok for receive on 500 kHz. For > > transmitting the 0,5 mW on the transperter output needs some work. We are > > allowed here to transmit with 5 W EIRP so i think i can use some output > > power in order to radiate this amount of power in a relatively short > > antenna. Who has made an amplifier for 500 kHz including ant switching > > circuit? I am very interested in a design that i can copy and build > > myself. Maybe also the team of Elecraft is working on something, however > > seen how busy they are with other things i dont think this has priority. > > Who can tell me their experience with the K3 on 500? > > > > Many thanks and a wonderful 2010 > > Dick PA3CW > > > > > > > > > > > ______________________________________________________________ > 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 -- 73 Brendan EI6IZ ______________________________________________________________ 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 pd0psb
Hi Paul,
Well that will certainly depend upon antenna efficiency, but QRO makes the antenna much easier and the power company happier :-) Happy New Year Wes --- On Sun, 1/3/10, pd0psb <[hidden email]> wrote: From: pd0psb <[hidden email]> Subject: Re: [Elecraft] [K3] K3 on 500 kHz To: [hidden email] Date: Sunday, January 3, 2010, 8:02 AM This one will certainly be able to deliver 5W EIRP, Wes :-) Nice design! 73' Paul PD0PSB Another link: http://www.w1vd.com/137-500KWTX.html Wes N7WS ______________________________________________________________ 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 PA3CW
Hello Dick,
if i don`t get wrong, Wayne mentioned a new transverter module for the K3 wich offers something for the lowfers a few weeks ago. Stay tuned ! 73 Michael
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What I meant was that you *could* make a transverter for these bands
and interface it to the K3 via KXV3 module. We don't have plans to offer one ourselves. 73, Wayne N6KR On Jan 4, 2010, at 10:03 AM, DL5OCD wrote: > > Hello Dick, > > if i don`t get wrong, Wayne mentioned a new transverter module for > the K3 > wich offers something for the > lowfers a few weeks ago. Stay tuned ! > > 73 > Michael > > > PA3CW wrote: >> >> Hello k3 Nabblers, >> >> I was happy surprized that now in The Netherlands we are also >> allowed to >> use 501 - 504 kHz in an experimental phase. As ex Radio Officer it >> has >> been around 25 years ago since my last transmission in this band! >> I was >> happy to discover that my K3 is very ok for receive on 500 kHz. For >> transmitting the 0,5 mW on the transperter output needs some work. >> We are >> allowed here to transmit with 5 W EIRP so i think i can use some >> output >> power in order to radiate this amount of power in a relatively short >> antenna. Who has made an amplifier for 500 kHz including ant >> switching >> circuit? I am very interested in a design that i can copy and build >> myself. Maybe also the team of Elecraft is working on something, >> however >> seen how busy they are with other things i dont think this has >> priority. >> Who can tell me their experience with the K3 on 500? >> >> Many thanks and a wonderful 2010 >> Dick PA3CW >> >> > > -- > View this message in context: http://n2.nabble.com/K3-on-500-kHz-tp4245663p4251212.html > Sent from the [K3] mailing list archive at Nabble.com. > ______________________________________________________________ > 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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Hi Wayne,
First of all best wishes for 2010 for you and yours, and i hope this year will even be better than '09 for Elecraft. Understood your remark of not planning a 500 kc module. I do understand seen the limited market for such a unit. In that case the tip of Paul about the Juma kit is most interesting to me. However, i am still looking for a way to feed the K3 input into the Juma design. My electronics knowledge is more than a bit outdated so maybe there are more people looking to the Juma in combi with the K3? Best rgds, Dick PA3CW |
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In reply to this post by wayne burdick
Wayne Burdick wrote:
> What I > meant was that you *could* make a transverter for these bands and > interface it to the K3 via KXV3 module. We don't have plans to offer one > ourselves. I've had a Palomar VLF Converter for years, works really great, and better with my K3. Converts [allegedly] DC to 500 KHz to 3.5 to 4.0 MHz. LORAN-C noise here on the US Pacific Coast is a bit of a problem, we're fairly close to Middletown CA which has a USCG LORAN station, but the loop will null most of it out. Seems to work good down to about 12 KHz, then things get mushy. I think I've even heard the power line carrier current telemetry ... we have a 145KV line close to us and I know it carries it, we have hydroelectric plants above and below us and I can see the chokes in the substations. That said, I haven't had the Palomar on for about a year, maybe I'll hook it up again and see what's there. There was some word [maybe urban legends] that the CG was going to shut down LORAN-C in the face of GPS. I've heard the West Coast 500KHZ ham beacon several times, can't remember the call now. I really can't see why Elecraft would want to delve into such a low volume market when there are a number of cheap alternatives already out there. I'd rather they work on the solid-state amps :-) As a High School senior at 16, I got to work ships at sea on 500Kcs from a coastal marine station as a relief operator. The Holy Frequency is eerily silent these days compared to then, when it was a sort of world-wide party-line. But, that was then and this is now. LoFer is sort of fun for awhile, but I can't transmit there and the fun tends to fade after I've identified all the NDB's I can hear. 73 and a Good New Year to all, Fred K6DGW Auburn CA USA ______________________________________________________________ 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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I ordered a Palomar VLF converter a year ago from HRO and they had to refund my money. They said that the VLF converter was no longer being made. The Palomar Engineers web site seems to reflect this. They only show balun stuff, now. 73, Rick Dettinger K7MW On Jan 4, 2010, at 7:13 PM, Fred Jensen wrote: > Wayne Burdick wrote: >> What I >> meant was that you *could* make a transverter for these bands and >> interface it to the K3 via KXV3 module. We don't have plans to >> offer one >> ourselves. > > I've had a Palomar VLF Converter for years, works really great, and > better with my K3. Converts [allegedly] DC to 500 KHz to 3.5 to 4.0 > MHz. LORAN-C noise here on the US Pacific Coast is a bit of a > problem, > we're fairly close to Middletown CA which has a USCG LORAN station, > but > the loop will null most of it out. Seems to work good down to about > 12 > KHz, then things get mushy. I think I've even heard the power line > carrier current telemetry ... we have a 145KV line close to us and I > know it carries it, we have hydroelectric plants above and below us > and > I can see the chokes in the substations. That said, I haven't had the > Palomar on for about a year, maybe I'll hook it up again and see > what's > there. There was some word [maybe urban legends] that the CG was > going > to shut down LORAN-C in the face of GPS. I've heard the West Coast > 500KHZ ham beacon several times, can't remember the call now. > > I really can't see why Elecraft would want to delve into such a low > volume market when there are a number of cheap alternatives already > out > there. I'd rather they work on the solid-state amps :-) > > As a High School senior at 16, I got to work ships at sea on 500Kcs > from > a coastal marine station as a relief operator. The Holy Frequency is > eerily silent these days compared to then, when it was a sort of > world-wide party-line. But, that was then and this is now. LoFer is > sort of fun for awhile, but I can't transmit there and the fun tends > to > fade after I've identified all the NDB's I can hear. > > 73 and a Good New Year to all, > > Fred K6DGW > Auburn CA USA > ______________________________________________________________ > 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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What about an engeneer from within the Elecraft community designing and drawing a schematic diagram of how to make about 60 Watts from the 0,5 mW and an antenna switching circuit? We can all warm up our soldering irons again and build it ourselves. I would love to...but don't have the necessary background of design and components. Maybe this will trigger some of the engeneers from within this K3 community!
The receiver does not need anything additional, the sensitivity on 500 kHz is quite ok as far as i am concearned. Who helps? :) Dick PA3CW |
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In reply to this post by Rick Dettinger-3
An alternative to Palomar is the VLF converter kit from Jackson Harbor
Press. I wrote a detailed review of the kit at http://www.cliftonlaboratories.com/jackson_harbor_press_vlf_converter.htm Jackson Harbor Press can be found at http://home.att.net/~jacksonharbor/ham.htm. Look for the LF Converter. Jack K8ZOA On 1/5/2010 10:00 AM, Rick Dettinger wrote: > I ordered a Palomar VLF converter a year ago from HRO and they had > to refund my money. They said that the VLF converter was no longer > being made. The Palomar Engineers web site seems to reflect this. > They only show balun stuff, now. > > 73, > > Rick Dettinger K7MW > > > On Jan 4, 2010, at 7:13 PM, Fred Jensen wrote: > > >> Wayne Burdick wrote: >> >>> What I >>> meant was that you *could* make a transverter for these bands and >>> interface it to the K3 via KXV3 module. We don't have plans to >>> offer one >>> ourselves. >>> >> I've had a Palomar VLF Converter for years, works really great, and >> better with my K3. Converts [allegedly] DC to 500 KHz to 3.5 to 4.0 >> MHz. LORAN-C noise here on the US Pacific Coast is a bit of a >> problem, >> we're fairly close to Middletown CA which has a USCG LORAN station, >> but >> the loop will null most of it out. Seems to work good down to about >> 12 >> KHz, then things get mushy. I think I've even heard the power line >> carrier current telemetry ... we have a 145KV line close to us and I >> know it carries it, we have hydroelectric plants above and below us >> and >> I can see the chokes in the substations. That said, I haven't had the >> Palomar on for about a year, maybe I'll hook it up again and see >> what's >> there. There was some word [maybe urban legends] that the CG was >> going >> to shut down LORAN-C in the face of GPS. I've heard the West Coast >> 500KHZ ham beacon several times, can't remember the call now. >> >> I really can't see why Elecraft would want to delve into such a low >> volume market when there are a number of cheap alternatives already >> out >> there. I'd rather they work on the solid-state amps :-) >> >> As a High School senior at 16, I got to work ships at sea on 500Kcs >> from >> a coastal marine station as a relief operator. The Holy Frequency is >> eerily silent these days compared to then, when it was a sort of >> world-wide party-line. But, that was then and this is now. LoFer is >> sort of fun for awhile, but I can't transmit there and the fun tends >> to >> fade after I've identified all the NDB's I can hear. >> >> 73 and a Good New Year to all, >> >> Fred K6DGW >> Auburn CA USA >> ______________________________________________________________ >> 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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Thanks Jack, but the K3 already CAN receive 500khz quite well with the right options installed! That is not the issue. The issue is to TRANSMIT on 500 khz, as the output ik deliveres is now only limited to 0,5 mW.
Dick PA3CW |
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In reply to this post by pd0psb
I am sorry there are no takers to help me with a simple design to get some more output on 500 kc. What about this design :http://wireless.org.uk/qtx.htm
Can i alter the input stage (HEF4060 part) by some other driver and will the input of the K3 than be sufficient? Thanks Dick PA3CW |
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This weekend i build the stand alone QTX design 500 khz transmitter. Very nice design! See: http://wireless.org.uk/qtx.htm But ...how can i use the K3 instead of the stage with the xtal osc/devider with the 4060? Any ideas? Dick PA3CW ..not an electronics engineer, but cw enthousiast.. |
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First made on 500kHz, but unfortunattely not yet with the K3 transmitting but a separate QTX trasmitter. Even more dedicated now to get the K3 transmitting, going from the 1,5 mW transverter output. What about copying the input circuit used in the XV transverter? If i step up to a reasonable power level i can use the final stages using IRF 510 or 540. Is this a good idea? Wayne? :)
Tks, Dick PA3CW |
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Ok gentleman,
Here comes my super simple design to get on 500 khz. Design with IRF tested with xtal osc. First stage tested with K3 and works as a breeze Simple and fun! Any comments welcome, Dick PA3CW http://groups.google.com/group/uk500khz/web/k3_500khz.PDF |
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