Re: [Elecraft] Suggestions needed - antenna to tuner
Why not ground the antenna and feed it as a Unipole? Most AM BC stations are doing that these days. They also use a remote tuner, although it is usually a fixed network as they only use one frequency. That way the reflected power on the line is nil. 73 Bob, K4TAX On 2/13/2018 12:29 PM, Chris Hallinan wrote: I have been using MFJ tuners outside (MFJ-927) on a 43' vertical in southwest Florida for many years. The only complaint I have is that they don't get along with thunderstorms. I've probably gone through half dozen of these over the years. However, it's worth it to me because when they work, they work well. Outside in Florida sun and summer rains and salt air is probably one of the most hostile environments for any electronics. And I don't protect them in any way so I'm amazed they work as long as they do. The only mod I make is to replace the ground lug with stainless steel hardware. When there is a threat of lightning, I ground the antenna (I have a large wing nut for that) and disconnect the tuner. If I forget, I might have to buy a new one ;) I love the idea of remote tuners - avoids the losses associated with coax and high SWR. 73, Chris On Tue, Feb 13, 2018 at 10:55 AM, Frank Stein wrote: I was thinking of a similar remote setup, wondering which remote autotuner is recommended? Thanks, Frank w4tg On Feb 13, 2018 8:56 AM, "Chris Hallinan" wrote: I have a very similar setup. K3 -> KPA500 -> MFJ 994BRT 600W autotuner mounted remote -> Balun Designs 4:1 -> 600 Ohm open wire line to 80 m doublet. It works fantastic on 80-20, but will not tune better than about 2:1 on 17. I cannot use the KPA500 on 17 because the SWR is too high. Nothing I've tried works. I'm wondering if it is simply the tuning range/resolution of the MFJ-994BRT? I like the idea of remote mounting, as I have only a couple feet of coax between the tuner and the balun, thus minimizing SWR-related feedline loss. Any suggestions for how to get it to tune on 17? 73 Chris - K1AY Punta Gorda, FL On Mon, Feb 12, 2018 at 12:16 PM, John W2XS wrote: I replaced my Johnson Matchbox with a Balun Designs tuner balun. The biggest benefit is that the K3 ATU remembers the settings from band to band so the QSY is very rapid. I love watching the DX spots come rolling through on my N3FJP logging program and clicking on them to QSY to that frequency and not have to tune up again. I use it on 80 through 6 meters with an 80m doublet fed with KW ladder line (300 ohm). My recommendation is to keep the piece of coax from the balun to the rig as short as possible. This is to minimize loss since that line will most likely be highly mis-matched on most bands. There was a QST article not that long ago which detailed the losses in that situation and I was surprised at how high they were. I once had an MFJ balanced RF Ammeter and made measurements of the JMB vs. the balun and they compared favorably. DJ0IP (referenced earlier) has kindly put those measurements on his website. (This is in the FWIW category!) I have not tried to substitute the tuner balun with another type but that might be a future experiment. 73, John W2XS -- Sent from: http://elecraft.365791.n2.nabble.com/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to challi...@gmail.com -- Life is like Linux - it never stands still. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to fst...@ieee.org __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA500 Info Disappeared From Website
Its fixed. :-) Eric /elecraft.com/ On 2/13/2018 10:33 AM, Don Wilhelm wrote: John and all, That is a website "quirk" only and you can expect it to be fixed as soon as the webmaster can get to it. The KPA500 has NOT been replaced by the KPA1500 - both are viable products. Note that it is still on the Order page. Also this month, the KAT500/KAT500 Power Combo has a special (reduced) pricing. 73, Don W3FPR On 2/13/2018 9:44 AM, j...@kk9a.com wrote: The photo also vanished from the products page http://www.elecraft.com/elecraft_products_page.htm I guess it was replaced by the KPA1500 :) __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to eric.swa...@elecraft.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA500 Info Disappeared From Website
John and all, That is a website "quirk" only and you can expect it to be fixed as soon as the webmaster can get to it. The KPA500 has NOT been replaced by the KPA1500 - both are viable products. Note that it is still on the Order page. Also this month, the KAT500/KAT500 Power Combo has a special (reduced) pricing. 73, Don W3FPR On 2/13/2018 9:44 AM, j...@kk9a.com wrote: The photo also vanished from the products page http://www.elecraft.com/elecraft_products_page.htm I guess it was replaced by the KPA1500 :) __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Suggestions needed - antenna to tuner
I have been using MFJ tuners outside (MFJ-927) on a 43' vertical in southwest Florida for many years. The only complaint I have is that they don't get along with thunderstorms. I've probably gone through half dozen of these over the years. However, it's worth it to me because when they work, they work well. Outside in Florida sun and summer rains and salt air is probably one of the most hostile environments for any electronics. And I don't protect them in any way so I'm amazed they work as long as they do. The only mod I make is to replace the ground lug with stainless steel hardware. When there is a threat of lightning, I ground the antenna (I have a large wing nut for that) and disconnect the tuner. If I forget, I might have to buy a new one ;) I love the idea of remote tuners - avoids the losses associated with coax and high SWR. 73, Chris On Tue, Feb 13, 2018 at 10:55 AM, Frank Stein wrote: > I was thinking of a similar remote setup, wondering which remote autotuner > is recommended? > Thanks, > Frank w4tg > > On Feb 13, 2018 8:56 AM, "Chris Hallinan" wrote: > >> I have a very similar setup. K3 -> KPA500 -> MFJ 994BRT 600W autotuner >> mounted remote -> Balun Designs 4:1 -> 600 Ohm open wire line to 80 m >> doublet. >> >> It works fantastic on 80-20, but will not tune better than about 2:1 on >> 17. I cannot use the KPA500 on 17 because the SWR is too high. Nothing >> I've tried works. I'm wondering if it is simply the tuning >> range/resolution of the MFJ-994BRT? I like the idea of remote mounting, >> as >> I have only a couple feet of coax between the tuner and the balun, thus >> minimizing SWR-related feedline loss. >> >> Any suggestions for how to get it to tune on 17? >> >> 73 >> Chris - K1AY >> Punta Gorda, FL >> >> >> On Mon, Feb 12, 2018 at 12:16 PM, John W2XS wrote: >> >> > I replaced my Johnson Matchbox with a Balun Designs tuner balun. The >> > biggest >> > benefit is that the K3 ATU remembers the settings from band to band so >> the >> > QSY is very rapid. I love watching the DX spots come rolling through on >> my >> > N3FJP logging program and clicking on them to QSY to that frequency and >> not >> > have to tune up again. I use it on 80 through 6 meters with an 80m >> doublet >> > fed with KW ladder line (300 ohm). >> > >> > My recommendation is to keep the piece of coax from the balun to the >> rig as >> > short as possible. This is to minimize loss since that line will most >> > likely be highly mis-matched on most bands. There was a QST article not >> > that >> > long ago which detailed the losses in that situation and I was >> surprised at >> > how high they were. >> > >> > I once had an MFJ balanced RF Ammeter and made measurements of the JMB >> vs. >> > the balun and they compared favorably. DJ0IP (referenced earlier) has >> > kindly put those measurements on his website. (This is in the FWIW >> > category!) >> > >> > I have not tried to substitute the tuner balun with another type but >> that >> > might be a future experiment. >> > >> > 73, John W2XS >> > >> > >> > >> > -- >> > Sent from: http://elecraft.365791.n2.nabble.com/ >> > __ >> > Elecraft mailing list >> > Home: http://mailman.qth.net/mailman/listinfo/elecraft >> > Help: http://mailman.qth.net/mmfaq.htm >> > Post: mailto:Elecraft@mailman.qth.net >> > >> > This list hosted by: http://www.qsl.net >> > Please help support this email list: http://www.qsl.net/donate.html >> > Message delivered to challi...@gmail.com >> > >> >> >> >> -- >> Life is like Linux - it never stands still. >> __ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to fst...@ieee.org >> > -- Life is like Linux - it never stands still. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA500 Info Disappeared From Website
I’ve noticed in the last week or so some errors like prices being off by a factor or ten, etc. But quickly fixed...like the kids were having fun on dad’s laptop 😳. No problem though, I too easily bought a new K3s... Chuck ke9uw Sent from my iPhone, cjack > On Feb 13, 2018, at 11:33 AM, Eric Swartz - WA6HHQ, Elecraft > wrote: > > And it is now fixed. Sorry about that! Thanks for the heads up everyone. > > No change to KPA500 product status. Still for sale and selling well. :-) > > 73, > Eric > /elecraft.com/ > > >>> On Feb 13, 2018, at 6:00 AM, Mark Goldberg wrote: >>> >>> The KPA500 links seem to have been broken on the Elecraft Website: >>> >>> Not Found >>> >>> The requested URL /KPA500/KPA500.htm was not found on this server. >>> >>> >>> 73, >>> >>> >>> Mark >>> >>> W7MLG >>> > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to c-haw...@illinois.edu __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Suggestions needed - antenna to tuner
Chris, If all else fails, cheat. Probably the very simplest thing you can do is mount an 17 meter element in parallel to the 80 meter element. It will be cheaper and no less efficient. 73, Barry K3NDM -- Original Message -- From: "Chris Hallinan" To: "John W2XS" Cc: "" Sent: 2/13/2018 8:55:23 AM Subject: Re: [Elecraft] Suggestions needed - antenna to tuner I have a very similar setup. K3 -> KPA500 -> MFJ 994BRT 600W autotuner mounted remote -> Balun Designs 4:1 -> 600 Ohm open wire line to 80 m doublet. It works fantastic on 80-20, but will not tune better than about 2:1 on 17. I cannot use the KPA500 on 17 because the SWR is too high. Nothing I've tried works. I'm wondering if it is simply the tuning range/resolution of the MFJ-994BRT? I like the idea of remote mounting, as I have only a couple feet of coax between the tuner and the balun, thus minimizing SWR-related feedline loss. Any suggestions for how to get it to tune on 17? 73 Chris - K1AY Punta Gorda, FL On Mon, Feb 12, 2018 at 12:16 PM, John W2XS wrote: I replaced my Johnson Matchbox with a Balun Designs tuner balun. The biggest benefit is that the K3 ATU remembers the settings from band to band so the QSY is very rapid. I love watching the DX spots come rolling through on my N3FJP logging program and clicking on them to QSY to that frequency and not have to tune up again. I use it on 80 through 6 meters with an 80m doublet fed with KW ladder line (300 ohm). My recommendation is to keep the piece of coax from the balun to the rig as short as possible. This is to minimize loss since that line will most likely be highly mis-matched on most bands. There was a QST article not that long ago which detailed the losses in that situation and I was surprised at how high they were. I once had an MFJ balanced RF Ammeter and made measurements of the JMB vs. the balun and they compared favorably. DJ0IP (referenced earlier) has kindly put those measurements on his website. (This is in the FWIW category!) I have not tried to substitute the tuner balun with another type but that might be a future experiment. 73, John W2XS -- Sent from: http://elecraft.365791.n2.nabble.com/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to challi...@gmail.com -- Life is like Linux - it never stands still. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to k3...@comcast.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA500 Info Disappeared From Website
And it is now fixed. Sorry about that! Thanks for the heads up everyone. No change to KPA500 product status. Still for sale and selling well. :-) 73, Eric /elecraft.com/ On Feb 13, 2018, at 6:00 AM, Mark Goldberg wrote: The KPA500 links seem to have been broken on the Elecraft Website: Not Found The requested URL /KPA500/KPA500.htm was not found on this server. 73, Mark W7MLG __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA500 Info Disappeared From Website
Working on this problem now. Thanks for catching it. Wayne http://www.elecraft.com > On Feb 13, 2018, at 6:00 AM, Mark Goldberg wrote: > > The KPA500 links seem to have been broken on the Elecraft Website: > > Not Found > > The requested URL /KPA500/KPA500.htm was not found on this server. > > > 73, > > > Mark > > W7MLG > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to n...@elecraft.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA500 Info Disappeared From Website
Entropy always wins. Logan, KZ6O Sent from my iPhone > On Feb 13, 2018, at 7:52 AM, rich hurd WC3T wrote: > > Confucius say, he who play with root, eventually kill tree. :) > > > On Tue, Feb 13, 2018 at 10:36 AM, Bob McGraw K4TAX > wrote: > >> Ya know...when one tinkers with something that works, often they end >> up with something that doesn't work.Just sayin' >> >> 73 >> >> Bob, K4TAX >> >> >> >>> On 2/13/2018 9:26 AM, rich hurd WC3T wrote: >>> >>> Hmm. I'd say that was sort of indicative of the entire Elecraft.com >>> domain... nothing seems to be online. >>> >>> On Tue, Feb 13, 2018 at 9:44 AM, j...@kk9a.com wrote: >>> >>> The photo also vanished from the products page http://www.elecraft.com/elecraft_products_page.htm I guess it was replaced by the KPA1500 :) John KK9A From: Mark W7MLG Date: Tue Feb 13 09:00:53 EST The KPA500 links seem to have been broken on the Elecraft Website: Not Found The requested URL /KPA500/KPA500.htm was not found on this server. 73, Mark W7MLG __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to r...@wc3t.us >>> >>> >> >> __ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to r...@wc3t.us >> > > > > -- > --- > 72, > Rich Hurd / WC3T / DMR: 3142737 > PA Army MARS, Northampton County RACES, EPA-ARRL Public Information Officer > for Scouting > Latitude: 40.761621 Longitude: -75.288988 (40°45.68' N 75°17.33' W) Grid: > *FN20is* > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to lra...@garlic.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Suggestions needed - antenna to tuner
I was thinking of a similar remote setup, wondering which remote autotuner is recommended? Thanks, Frank w4tg On Feb 13, 2018 8:56 AM, "Chris Hallinan" wrote: > I have a very similar setup. K3 -> KPA500 -> MFJ 994BRT 600W autotuner > mounted remote -> Balun Designs 4:1 -> 600 Ohm open wire line to 80 m > doublet. > > It works fantastic on 80-20, but will not tune better than about 2:1 on > 17. I cannot use the KPA500 on 17 because the SWR is too high. Nothing > I've tried works. I'm wondering if it is simply the tuning > range/resolution of the MFJ-994BRT? I like the idea of remote mounting, as > I have only a couple feet of coax between the tuner and the balun, thus > minimizing SWR-related feedline loss. > > Any suggestions for how to get it to tune on 17? > > 73 > Chris - K1AY > Punta Gorda, FL > > > On Mon, Feb 12, 2018 at 12:16 PM, John W2XS wrote: > > > I replaced my Johnson Matchbox with a Balun Designs tuner balun. The > > biggest > > benefit is that the K3 ATU remembers the settings from band to band so > the > > QSY is very rapid. I love watching the DX spots come rolling through on > my > > N3FJP logging program and clicking on them to QSY to that frequency and > not > > have to tune up again. I use it on 80 through 6 meters with an 80m > doublet > > fed with KW ladder line (300 ohm). > > > > My recommendation is to keep the piece of coax from the balun to the rig > as > > short as possible. This is to minimize loss since that line will most > > likely be highly mis-matched on most bands. There was a QST article not > > that > > long ago which detailed the losses in that situation and I was surprised > at > > how high they were. > > > > I once had an MFJ balanced RF Ammeter and made measurements of the JMB > vs. > > the balun and they compared favorably. DJ0IP (referenced earlier) has > > kindly put those measurements on his website. (This is in the FWIW > > category!) > > > > I have not tried to substitute the tuner balun with another type but that > > might be a future experiment. > > > > 73, John W2XS > > > > > > > > -- > > Sent from: http://elecraft.365791.n2.nabble.com/ > > __ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to challi...@gmail.com > > > > > > -- > Life is like Linux - it never stands still. > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to fst...@ieee.org > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA500 Info Disappeared From Website
Confucius say, he who play with root, eventually kill tree. :) On Tue, Feb 13, 2018 at 10:36 AM, Bob McGraw K4TAX wrote: > Ya know...when one tinkers with something that works, often they end > up with something that doesn't work.Just sayin' > > 73 > > Bob, K4TAX > > > > On 2/13/2018 9:26 AM, rich hurd WC3T wrote: > >> Hmm. I'd say that was sort of indicative of the entire Elecraft.com >> domain... nothing seems to be online. >> >> On Tue, Feb 13, 2018 at 9:44 AM, j...@kk9a.com wrote: >> >> The photo also vanished from the products page >>> http://www.elecraft.com/elecraft_products_page.htm >>> >>> I guess it was replaced by the KPA1500 :) >>> >>> John KK9A >>> >>> >>> From: Mark W7MLG >>> Date: Tue Feb 13 09:00:53 EST >>> >>> The KPA500 links seem to have been broken on the Elecraft Website: >>> >>> Not Found >>> >>> The requested URL /KPA500/KPA500.htm was not found on this server. >>> >>> >>> 73, >>> >>> >>> Mark >>> >>> W7MLG >>> >>> __ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:Elecraft@mailman.qth.net >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> Message delivered to r...@wc3t.us >>> >>> >> >> > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to r...@wc3t.us > -- --- 72, Rich Hurd / WC3T / DMR: 3142737 PA Army MARS, Northampton County RACES, EPA-ARRL Public Information Officer for Scouting Latitude: 40.761621 Longitude: -75.288988 (40°45.68' N 75°17.33' W) Grid: *FN20is* __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA500 Info Disappeared From Website
Ya know...when one tinkers with something that works, often they end up with something that doesn't work. Just sayin' 73 Bob, K4TAX On 2/13/2018 9:26 AM, rich hurd WC3T wrote: Hmm. I'd say that was sort of indicative of the entire Elecraft.com domain... nothing seems to be online. On Tue, Feb 13, 2018 at 9:44 AM, j...@kk9a.com wrote: The photo also vanished from the products page http://www.elecraft.com/elecraft_products_page.htm I guess it was replaced by the KPA1500 :) John KK9A From: Mark W7MLG Date: Tue Feb 13 09:00:53 EST The KPA500 links seem to have been broken on the Elecraft Website: Not Found The requested URL /KPA500/KPA500.htm was not found on this server. 73, Mark W7MLG __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to r...@wc3t.us __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA500 Info Disappeared From Website
Hmm. I'd say that was sort of indicative of the entire Elecraft.com domain... nothing seems to be online. On Tue, Feb 13, 2018 at 9:44 AM, j...@kk9a.com wrote: > The photo also vanished from the products page > http://www.elecraft.com/elecraft_products_page.htm > > I guess it was replaced by the KPA1500 :) > > John KK9A > > > From: Mark W7MLG > Date: Tue Feb 13 09:00:53 EST > > The KPA500 links seem to have been broken on the Elecraft Website: > > Not Found > > The requested URL /KPA500/KPA500.htm was not found on this server. > > > 73, > > > Mark > > W7MLG > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to r...@wc3t.us > -- --- 72, Rich Hurd / WC3T / DMR: 3142737 PA Army MARS, Northampton County RACES, EPA-ARRL Public Information Officer for Scouting Latitude: 40.761621 Longitude: -75.288988 (40°45.68' N 75°17.33' W) Grid: *FN20is* __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KPA500 Info Disappeared From Website
The photo also vanished from the products page http://www.elecraft.com/elecraft_products_page.htm I guess it was replaced by the KPA1500 :) John KK9A From: Mark W7MLG Date: Tue Feb 13 09:00:53 EST The KPA500 links seem to have been broken on the Elecraft Website: Not Found The requested URL /KPA500/KPA500.htm was not found on this server. 73, Mark W7MLG __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Suggestions needed - antenna to tuner
Have you tried adding some additional length to the 600 ohm feedline? I originally couldn't perfectly match 30 meters with the Johnson Matchbox and added about 15 or 18 feet IIRC. That brought 30m into range and didn't mess up the other bands too much. Since your worst band is 17m, you might need only a few feet (5 or 10 is a swag). 73, John W2XS -- Sent from: http://elecraft.365791.n2.nabble.com/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Suggestions needed - antenna to tuner
Thanks, Don, Yes I understand the basics - the doublet is not typically used in a "matched" configuration, thus the need for the tuner. If I understand correctly, it can present from very low to very high impedances to the tuner. I will try a 1:1 and/or adding some wire length. Also, as I mentioned in my previous post, I've been wanting to get up on the ladder and scan it with my Array Solutions antenna analyzer to see what it really presents to the tuner. That may help me understand what I need to do. 73, Chris - K1AY On Tue, Feb 13, 2018 at 9:13 AM, Don Wilhelm wrote: > Chris, > > Try a 1:1 balun instead of the 4:1. You are matching the impedance seen > at the shack end of the feedline, and that can vary from very low to very > high. > The impedance you have to match is NOT the characteristic impedance of the > feedline. The 600 ohm line simply acts as an impedance transformer. > The only time you will see a 600 ohm impedance at the shack end of that > feedline is when the far end is terminated by 600 ohms, and I suggest that > is not true of the feedpoint impedance at the antenna. > > 73, > Don W3FPR > > > On 2/13/2018 8:55 AM, Chris Hallinan wrote: > >> I have a very similar setup. K3 -> KPA500 -> MFJ 994BRT 600W autotuner >> mounted remote -> Balun Designs 4:1 -> 600 Ohm open wire line to 80 m >> doublet. >> >> It works fantastic on 80-20, but will not tune better than about 2:1 on >> 17. I cannot use the KPA500 on 17 because the SWR is too high. Nothing >> I've tried works. I'm wondering if it is simply the tuning >> range/resolution of the MFJ-994BRT? I like the idea of remote mounting, >> as >> I have only a couple feet of coax between the tuner and the balun, thus >> minimizing SWR-related feedline loss. >> > -- Life is like Linux - it never stands still. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Suggestions needed - antenna to tuner
Chris, Try a 1:1 balun instead of the 4:1. You are matching the impedance seen at the shack end of the feedline, and that can vary from very low to very high. The impedance you have to match is NOT the characteristic impedance of the feedline. The 600 ohm line simply acts as an impedance transformer. The only time you will see a 600 ohm impedance at the shack end of that feedline is when the far end is terminated by 600 ohms, and I suggest that is not true of the feedpoint impedance at the antenna. 73, Don W3FPR On 2/13/2018 8:55 AM, Chris Hallinan wrote: I have a very similar setup. K3 -> KPA500 -> MFJ 994BRT 600W autotuner mounted remote -> Balun Designs 4:1 -> 600 Ohm open wire line to 80 m doublet. It works fantastic on 80-20, but will not tune better than about 2:1 on 17. I cannot use the KPA500 on 17 because the SWR is too high. Nothing I've tried works. I'm wondering if it is simply the tuning range/resolution of the MFJ-994BRT? I like the idea of remote mounting, as I have only a couple feet of coax between the tuner and the balun, thus minimizing SWR-related feedline loss. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] Suggestions needed - antenna to tuner
Continue with the balanced line to the dipole ~ mine is spaced 10cm #
14 wire {home-assembled}
and use the Johnson Match-Box = it is a balanced line output tuner ~ NO
need for a current balun
or similar, like a Z-Match . . . Reference: REFLECTIONS by Maxwell
Cheers, Jan K1ND
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Re: [Elecraft] Suggestions needed - antenna to tuner
Thanks, Bob. I'll do just that when I get a chance. And I might just try the 1:1 also! I have an Array Solutions analyzer, been meaning to scan it to see exactly what the tuner sees. All of this requires a ladder and some creative juggling of tools/laptop etc. ;) 73 Chris On Tue, Feb 13, 2018 at 9:04 AM, Bob McGraw K4TAX wrote: > Chris; > > Add or remove about 6 ft of the open wire line. See if this helps the 17M > issue. > > I personally don't like the idea of using a 4:1 balun and much prefer a > 1:1 current balun. With the 4:1, without measuring the Z on the coax side, > it may be the Z presented to the tuner is very low and thus outside the > range of the tuner. Additionally, it is most likely with almost every > ATU, the greatest loss occurs when the Z is low to very low. Hence my > reason for using a 1:1 and not a 4:1. > > 73 > > Bob, K4TAX > > > > On 2/13/2018 7:55 AM, Chris Hallinan wrote: > >> I have a very similar setup. K3 -> KPA500 -> MFJ 994BRT 600W autotuner >> mounted remote -> Balun Designs 4:1 -> 600 Ohm open wire line to 80 m >> doublet. >> >> It works fantastic on 80-20, but will not tune better than about 2:1 on >> 17. I cannot use the KPA500 on 17 because the SWR is too high. Nothing >> I've tried works. I'm wondering if it is simply the tuning >> range/resolution of the MFJ-994BRT? I like the idea of remote mounting, >> as >> I have only a couple feet of coax between the tuner and the balun, thus >> minimizing SWR-related feedline loss. >> >> Any suggestions for how to get it to tune on 17? >> >> 73 >> Chris - K1AY >> Punta Gorda, FL >> >> >> On Mon, Feb 12, 2018 at 12:16 PM, John W2XS wrote: >> >> I replaced my Johnson Matchbox with a Balun Designs tuner balun. The >>> biggest >>> benefit is that the K3 ATU remembers the settings from band to band so >>> the >>> QSY is very rapid. I love watching the DX spots come rolling through on >>> my >>> N3FJP logging program and clicking on them to QSY to that frequency and >>> not >>> have to tune up again. I use it on 80 through 6 meters with an 80m >>> doublet >>> fed with KW ladder line (300 ohm). >>> >>> My recommendation is to keep the piece of coax from the balun to the rig >>> as >>> short as possible. This is to minimize loss since that line will most >>> likely be highly mis-matched on most bands. There was a QST article not >>> that >>> long ago which detailed the losses in that situation and I was surprised >>> at >>> how high they were. >>> >>> I once had an MFJ balanced RF Ammeter and made measurements of the JMB >>> vs. >>> the balun and they compared favorably. DJ0IP (referenced earlier) has >>> kindly put those measurements on his website. (This is in the FWIW >>> category!) >>> >>> I have not tried to substitute the tuner balun with another type but that >>> might be a future experiment. >>> >>> 73, John W2XS >>> >>> >>> >>> -- >>> Sent from: http://elecraft.365791.n2.nabble.com/ >>> __ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:Elecraft@mailman.qth.net >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> Message delivered to challi...@gmail.com >>> >>> >> >> > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to challi...@gmail.com > -- Life is like Linux - it never stands still. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Suggestions needed - antenna to tuner
Chris; Add or remove about 6 ft of the open wire line. See if this helps the 17M issue. I personally don't like the idea of using a 4:1 balun and much prefer a 1:1 current balun. With the 4:1, without measuring the Z on the coax side, it may be the Z presented to the tuner is very low and thus outside the range of the tuner. Additionally, it is most likely with almost every ATU, the greatest loss occurs when the Z is low to very low. Hence my reason for using a 1:1 and not a 4:1. 73 Bob, K4TAX On 2/13/2018 7:55 AM, Chris Hallinan wrote: I have a very similar setup. K3 -> KPA500 -> MFJ 994BRT 600W autotuner mounted remote -> Balun Designs 4:1 -> 600 Ohm open wire line to 80 m doublet. It works fantastic on 80-20, but will not tune better than about 2:1 on 17. I cannot use the KPA500 on 17 because the SWR is too high. Nothing I've tried works. I'm wondering if it is simply the tuning range/resolution of the MFJ-994BRT? I like the idea of remote mounting, as I have only a couple feet of coax between the tuner and the balun, thus minimizing SWR-related feedline loss. Any suggestions for how to get it to tune on 17? 73 Chris - K1AY Punta Gorda, FL On Mon, Feb 12, 2018 at 12:16 PM, John W2XS wrote: I replaced my Johnson Matchbox with a Balun Designs tuner balun. The biggest benefit is that the K3 ATU remembers the settings from band to band so the QSY is very rapid. I love watching the DX spots come rolling through on my N3FJP logging program and clicking on them to QSY to that frequency and not have to tune up again. I use it on 80 through 6 meters with an 80m doublet fed with KW ladder line (300 ohm). My recommendation is to keep the piece of coax from the balun to the rig as short as possible. This is to minimize loss since that line will most likely be highly mis-matched on most bands. There was a QST article not that long ago which detailed the losses in that situation and I was surprised at how high they were. I once had an MFJ balanced RF Ammeter and made measurements of the JMB vs. the balun and they compared favorably. DJ0IP (referenced earlier) has kindly put those measurements on his website. (This is in the FWIW category!) I have not tried to substitute the tuner balun with another type but that might be a future experiment. 73, John W2XS -- Sent from: http://elecraft.365791.n2.nabble.com/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to challi...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KPA500 Info Disappeared From Website
The KPA500 links seem to have been broken on the Elecraft Website: Not Found The requested URL /KPA500/KPA500.htm was not found on this server. 73, Mark W7MLG __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Used K3 price?
Does it have any upgrades, such as the new Synth and DSP module? I've just seen a K3 + P3 go for $2670 on eBay UK. 73, Alan. G4GNX -Original Message- From: John Fritze Sent: Tuesday, February 13, 2018 1:42 PM To: elecraft@mailman.qth.net Subject: [Elecraft] Used K3 price? I am helping a friend. What does a used K3 go for today? K3 Serial number +/- 6500 100 watts Antenna tuner No other options. Looks like new (inside and out) non smoker OK to e-mail me direct, thanks -- John Fritze Jr K2QY k...@arrl.org ENY Section Manager Twitter: @k2qy 401 261 4996 (cell) __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Suggestions needed - antenna to tuner
I have a very similar setup. K3 -> KPA500 -> MFJ 994BRT 600W autotuner mounted remote -> Balun Designs 4:1 -> 600 Ohm open wire line to 80 m doublet. It works fantastic on 80-20, but will not tune better than about 2:1 on 17. I cannot use the KPA500 on 17 because the SWR is too high. Nothing I've tried works. I'm wondering if it is simply the tuning range/resolution of the MFJ-994BRT? I like the idea of remote mounting, as I have only a couple feet of coax between the tuner and the balun, thus minimizing SWR-related feedline loss. Any suggestions for how to get it to tune on 17? 73 Chris - K1AY Punta Gorda, FL On Mon, Feb 12, 2018 at 12:16 PM, John W2XS wrote: > I replaced my Johnson Matchbox with a Balun Designs tuner balun. The > biggest > benefit is that the K3 ATU remembers the settings from band to band so the > QSY is very rapid. I love watching the DX spots come rolling through on my > N3FJP logging program and clicking on them to QSY to that frequency and not > have to tune up again. I use it on 80 through 6 meters with an 80m doublet > fed with KW ladder line (300 ohm). > > My recommendation is to keep the piece of coax from the balun to the rig as > short as possible. This is to minimize loss since that line will most > likely be highly mis-matched on most bands. There was a QST article not > that > long ago which detailed the losses in that situation and I was surprised at > how high they were. > > I once had an MFJ balanced RF Ammeter and made measurements of the JMB vs. > the balun and they compared favorably. DJ0IP (referenced earlier) has > kindly put those measurements on his website. (This is in the FWIW > category!) > > I have not tried to substitute the tuner balun with another type but that > might be a future experiment. > > 73, John W2XS > > > > -- > Sent from: http://elecraft.365791.n2.nabble.com/ > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to challi...@gmail.com > -- Life is like Linux - it never stands still. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] Used K3 price?
I am helping a friend. What does a used K3 go for today? K3 Serial number +/- 6500 100 watts Antenna tuner No other options. Looks like new (inside and out) non smoker OK to e-mail me direct, thanks -- John Fritze Jr K2QY k...@arrl.org ENY Section Manager Twitter: @k2qy 401 261 4996 (cell) __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] N2BC SK
Yes, is very sad. I am very sorry that Bill left us. I proudly own his second Elecrat K2 #6254, he built that K2 in the 2007 with all the options and he sold it in 2009. I don't know how it arrive to me, but i am happy to own it, i love the K2 and that K2, it will never live my shack. K3_EZ is a great software, unfortunately Bill doesn't leave the source code around, otherwise someone else could have work on it after Bill. For example, G4ILO leave the source code for his KComm and i was able to implement the K3s support. If someone is interested to KComm, you can find on my site here: http://www.iw2noy.it/index.php?id=86#Eng RIP Bill, many thanks for all. Best regarda and 73's de IW2NOY Il 13/02/2018 04:30, Jim AC0E ha scritto: Sad news that the author of K3_EZ, Bill Coleman has become a Silent Key.. https://www.qrz.com/db/n2bc His program is what the K3 Utility SHOULD resemble.. 73 ~ Jim AC0E __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to grazi...@roccon.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] Elecraft SSB Net - Report
Please consider joining us for the weekly Elecraft SSB net on Sunday’s at 18:00z (UTC). We meet at 14.303.5 in the 20m band. Eric, WB9JNZ, who serves as Net Control sends the following log from this last week’s net (see below). 73 John, N6JW Elecraft SSB Net 2-10-2018 WB9JNZ Eric IL K3 4017 Net Control N6JW John CA K3 936 W4RKS Jim TX K3 3618 NC0JW Jim CO KX3 1356 K6WVE Stan MI K3 650 K1NW Brian RI K3 4974 K9ING Bob TX K3 5693 K7JG John WA KX3 3519 NS7P Phil OR K3 1826 W7QHD Kurt CA KX3 8697 ZL1PWD Peter New Zealand K3 139 WW4JF John TN K3S 11177 KS6F Guy CA K3S 10560 WM6P Steve GA K3S 11453 W4DML Doug TN K3 6433 N0MPM Mike IA K3S 10514 N2TNQ Len NJ K3 5270 KN5L John TX K2 7212 KR6BB George CA ICOM 706 1ST TIME CHECK IN KG6RQY Ken TX KX3 9582 1ST TIME CHECK IN WB0RRU David CO 857D N0NB Nate KS K3 4762 KB3UFB Tommy PA TS 430 W4LDD Larry NC Apache Labs also a KX3 7664 AB9V Mike IN K3S 10131 W7LDE Lance WA Yaesu 991 W1NGA Al CO KX3 2829 AE6JV Bill CA K3 6299 W7REK Glenn AZ K3 2843 WA8SAJ Jeff OH K3 5502 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] UHF connectors [was: Array Solutions Lightning Arrestor]
In fact my N-connector at my in-line Bird Meter element does get warm enough at 1500w at 144-MHz to "barely" discern by touch. Since room temp (70F) is 17c the connector may be at about 25c (nothing to write home about). When I first began operation of my 2m-8877 above 1kW it did burn up a N-connector which probably had poor connection. It was an old run of RG213 which should have been replaced for running that level. I replaced the two sections of coax with a single 20-foot run of LMR-600 which dissipates 0.216 dB which at 1500w is 73w power loss). LMR-600 at 150-MHz is rated at 1.08 dB loss/100-foot. So I run the amp with 1400w indicated by power meter which implies the amp is outputing 1500w (nom.). Most of the time I run 1300w which allows for 5% calib. error in the Bird indication. In the effort to achieve best NF at 1296, I actually measured connector loss in an N-elbow. It was below my measurement resolution of 0.02 dB. How I measured loss was by reading thermal noise from a 50-ohm termination with my SDR-IQ with sw set or 0.02-dB/DIV display. I only began to see some loss when I connected N-elbow + N-relay + N/sma adapter. That measured 0.15 dB at 1296-MHz. Interestingly 0.1 dB was contributed by just the N/sma adapter. For use below 50-MHz connector loss is negligible. Cable loss is way more significant but only above 50-MHz. Of course that is for NEW cable. That 25-year old run of RG8 might be loosing 2-3 dB at 20m. Cables do not last forever! Hint: measure them to know. 73, Ed - KL7UW From: Jim Brown To: elecraft@mailman.qth.net Subject: Re: [Elecraft] UHF connectors [was: Array Solutions Lightning Arrestor] Thanks for this excellent post, Alan! IMO, "mismatch loss" is a figment of the imagination of those who never get outside the lab. Transmission lines was one of my favorite EE courses, and I never heard of it until I heard it referenced in online discussions a few years ago. And the purported losses in connectors are an urban legend with almost basis in fact. Several years ago, W8JI poetically observed that if the 1 dB loss falsely attributed to UHF connectors was true, each would be burning 35 W carrying a legal limit signal, and be starting fires! Keeping track of losses in systems is, of course, a great thing. Our FD group runs (and has won several times) FD 1A QRP Battery. Every piece of coax in our station is low loss RG8 or RG11. 73, Jim K9YC 73, Ed - KL7UW http://www.kl7uw.com Dubus-NA Business mail: dubus...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
