OT: 3L rotating 160m yagi
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I bet this will add some punch to your Top Band QRP signal.
http://www.ok1rr.com/news.php Scroll down a bit. It is difficult to imagine the scale, so read a little about it. de Doug KR2Q _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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On Tue, 30 Dec 2008 12:20:58 -0500, you wrote:
>I bet this will add some punch to your Top Band QRP signal. > >http://www.ok1rr.com/news.php > >Scroll down a bit. It is difficult to imagine the scale, so read a >little about it. > >de Doug KR2Q [snip] That's insane!.... And... I'm insanely jealous! Tom Hinson Childers, N5GE K3 #806, XV144, XV432 Mini-Modules http://www.eQSL.cc/Member.cfm?N5GE http://www.n5ge.com http://www.swotrc.net _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Amateur Radio Operator N5GE
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Re: OT: 3L rotating 160m yagi
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In reply to this post by DOUGLAS ZWIEBEL
I think those guys probably are scrapping the bottom of the Ham Purity Test. We join our Elmer on question 168: 168: Have you climbed a tower? 169: For a 80m beam? 170: For a 160m beam? 171: Have you climbed on a boom? 172: Inside a boom? 173: for a purpose other than adjusting the antenna/boom? 174: did you bring your KXV1 with you? 175: did you work DX? 176: DXCC? _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: OT: 3L rotating 160m yagi
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In reply to this post by DOUGLAS ZWIEBEL
_______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by N5GE
Tom wrote:
> On Tue, 30 Dec 2008 12:20:58 -0500, you wrote: > >> I bet this will add some punch to your Top Band QRP signal. >> >> http://www.ok1rr.com/news.php >> >> Scroll down a bit. It is difficult to imagine the scale, so read a >> little about it. >> >> de Doug KR2Q > [snip] > > That's insane!.... > > And... I'm insanely jealous! Actually, I am pleased. At last I will be able to work Europe on 160! -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: OT: 3L rotating 160m yagi
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In reply to this post by k0wa@swbell.net
> "I took mine down last week. Thinking of something to put up
that is bigger."
With that much work and cost involved, it's good
that the antenna is located in an isolated area. Can you imagine
installing that system, only to find S9 noise from an
uncooperative neighbor's plasma television?
Paul, W9AC _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: OT: 3L rotating 160m yagi
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Paul Christensen wrote:
> > "I took mine down last week. Thinking of something to put up that is > bigger." > > With that much work and cost involved, it's good that the antenna is > located in an isolated area. Can you imagine installing that system, > only to find S9 noise from an uncooperative neighbor's plasma television? What's the problem? First, you zap him. If that doesn't help, you buy his house to tear it down. Small change compared to these antennas. 73 Jon LA4RT _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Jon Kåre Hellan wrote:
> Paul Christensen wrote: >> > "I took mine down last week. Thinking of something to put up that >> is bigger." >> >> With that much work and cost involved, it's good that the antenna is >> located in an isolated area. Can you imagine installing that system, >> only to find S9 noise from an uncooperative neighbor's plasma television? > > What's the problem? > > First, you zap him. > > If that doesn't help, you buy his house to tear it down. Small change > compared to these antennas. There is a well-known ham (I won't mention his call) who actually bought a neighbor's house, which he now uses as a rental investment. And, oh yes, he put a second tower and some guy anchors for his main tower in the back yard. The tenants don't mind at all. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by DOUGLAS ZWIEBEL
That will be an interesting experiment but I'm glad I'm not funding it! There is data that suggests it may not work as well as one might expect (i.e. a vertical array may be better). There's a unique aspect to 160 propagation called magnetic coupling loss which K9LA describes briefly in his Polarization article: "Again, as expected, the characteristic waves take different paths through the ionosphere -- but the difference is significantly more on 160m because 1.8MHz is very close to the electron gyro-frequency (which varies from about 0.7 to 1.7MHz worldwide depending on the intensity of the magnetic field), which significantly modifies the index of refraction of the x-wave. And as we saw on 10m, the x-wave refracts more than the o-wave. The other obvious result is that the x-wave, over the same one-hop path, suffers significantly more absorption than the o-wave. Again, this is due to 1.8MHz being very close to the electron gyro-frequency, which significantly modifies the amount of absorption of the x-wave. Because of this, the x-wave is usually ignored in propagation studies on 160m (and on the AM broadcast band, too). This effect is also seen on 80m, but to a lesser extent." http://mysite.verizon.net/k9la/sitebuildercontent/sitebuilderfiles/polarization.pdf Several who have tried *high* horizontal dipoles (0.5 wl = 270') on 160 find they do not work nearly as well as verticals. Conversely, on 80 meters, horizontal antennas work very well indeed. I'm sure the 5 element at the OH8X site will work quite well, but the jury is still out on the 160 Yagi IMHO. I hope they have a good vertical system for comparisons. If you want to read (a lot!) more, try typing "coupling loss" or "polarization loss" into the box at the top of this page: http://lists.contesting.com/archives//html/Topband/ 73, Bill W4ZV |
RE: OT: 3L rotating 160m yagi
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In reply to this post by Vic K2VCO
I can only imagine the size of the rotator needed to move that monster! I
suppose it's only a matter of time before someone put something like that up in the USA. I'll bet the restrictive covenant writers blow a gasket when they hear about something like that. Bruce-W8FU -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Vic K2VCO Sent: Tuesday, December 30, 2008 2:10 PM To: Tom Cc: Elecraft Reflector Subject: Re: [Elecraft] OT: 3L rotating 160m yagi Tom wrote: > On Tue, 30 Dec 2008 12:20:58 -0500, you wrote: > >> I bet this will add some punch to your Top Band QRP signal. >> >> http://www.ok1rr.com/news.php >> >> Scroll down a bit. It is difficult to imagine the scale, so read a >> little about it. >> >> de Doug KR2Q > [snip] > > That's insane!.... > > And... I'm insanely jealous! Actually, I am pleased. At last I will be able to work Europe on 160! -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Bill W4ZV
Bill W4ZV wrote:
> but the difference is significantly more on 160m because 1.8MHz is very > close to the > electron gyro-frequency (which varies from about 0.7 to 1.7MHz worldwide > depending > on the intensity of the magnetic field), which significantly modifies the > index of > refraction of the x-wave. And as we saw on 10m, the x-wave refracts more > than the o-wave. How do I get a "gyro-frequency"? 73, Fred K6DGW - Northern California Contest Club - CU in the 2009 Cal QSO Party 3-4 Oct 2009 - www.cqp.org _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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