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#11
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6 meter antenna ideas.....
On Thu, 27 Jun 2013 17:46:19 -0700, "Wayne"
wrote: I guess I wasn't specific on the interests. So far, just CW and SSB. I have mostly been getting a HF 7-28 Mhz antenna set up. Now I'm looking at 6. Well, you can ignore most of what I scribbled. Welcome to horizontal polarization. My guess(tm) is that a horizontal yagi or dipole in the attic is going to have problems due to all the wiring and possibly conduit in the attic. A vertical is at least mostly away from the wiring, but a horizontal antenna lands right in the middle of the mess. There's also the not so wonderful noise produced by electronic ballasts, LED lighting inverters, and ceiling fans. I guess(tm) that an outside cross polarized vertical or loop antenna would work better than anything horizontal inside the attic. A rotary array would be difficult in the attic, but switched directive arrays may be possible. Or, a non-rotating electrical wire horizontal yagi between the rafters. There are also temporary antennas that can be rolled out when needed, and hidden when the neighbors arrive in force: http://www.bigskyspaces.com/w7gj/6mRopeYagi.htm Because all of the CW/SSB action is at the very bottom of the band, a narrow bandwidth antenna works just fine. Time to spend some effort with EZNEC. I suggest 4NEC2 instead: http://www.qsl.net/4nec2/ The program includes a substantial number of common antenna models to plagiarize. Dual 5/8 wave 50 Mhz vertical (without matching xformer): http://802.11junk.com/jeffl/antennas/gnd-plane-02/index.html -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#12
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6 meter antenna ideas.....
"Jeff Liebermann" wrote in message ... On Thu, 27 Jun 2013 17:46:19 -0700, "Wayne" wrote: I guess I wasn't specific on the interests. So far, just CW and SSB. I have mostly been getting a HF 7-28 Mhz antenna set up. Now I'm looking at 6. snip Time to spend some effort with EZNEC. # I suggest 4NEC2 instead: http://www.qsl.net/4nec2/ # The program includes a substantial number of common antenna models to # plagiarize. Thanks, I'll give it a try. By the way, I have no homeowner's association constraints. It is a normal sized house on a small lot that slopes down in the back, and has no suitable trees. Wayne W5GIE Redlands, CA |
#13
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6 meter antenna ideas.....
"Wayne" wrote in message ... # Are you doing CW and SSB at the bottom of the 6 meter band? Yes. Now we are getting somewhere. For 6 meter ssb you normally want the antenna to be horizontal. There is about a 20 db differance if the antennas are not the same. You are not going to be able to work very far on 6 metes with simple, low antennas unless the band is open. When the band opens, it is possiable to work thousands of miles with low power and not very good antennas. I worked from North Carolina to Canada with 10 watts and an antenna that was a 40 meter dipole during one opening. As for vhf you first want to get the antenna as high as you can, and then make it as big as you can. Height is usually beter than size for local work. |
#14
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6 meter antenna ideas.....
On Thu, 27 Jun 2013 13:04:02 -0700, Paul Drahn wrote:
Google for "KG4JJH 6 moxon" and you will find a lot of references, including a PDF of an April 2004 QST article. KD7HB Thanks Paul for the suggestion. KG4JJH has some nice projects in his site. It's very well laid out too. I love to look through sites like his that have interesting ham radio related projects. 73, Bob KB2ZGN |
#15
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6 meter antenna ideas.....
On Thursday, June 27, 2013 2:05:51 PM UTC-5, Wayne wrote:
Needs to be either in the attic, or on a metal patio cover. A vertical on top of a 20 foot pole "might" be possible. Currently I am using a 1/4 wave vertical mag mount on top of a metal patio cover. I also have a half wave dipole in the attic. So, any ideas for something better? Wayne W5GIE A friend built a single element quad or full wave loop using wire and pvc pipe for spreaders and this worked pretty well. Also is fairly compact to put into the attic or hide it if needed outside. 73, Randy, w5kcm |
#16
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6 meter antenna ideas.....
"w5kcm" wrote in message ... On Thursday, June 27, 2013 2:05:51 PM UTC-5, Wayne wrote: Needs to be either in the attic, or on a metal patio cover. A vertical on top of a 20 foot pole "might" be possible. Currently I am using a 1/4 wave vertical mag mount on top of a metal patio cover. I also have a half wave dipole in the attic. So, any ideas for something better? Wayne W5GIE # A friend built a single element quad or full wave loop using wire and pvc pipe for spreaders and this worked pretty well. Also is fairly compact to put into the attic or hide it if needed outside. # 73, Randy, w5kcm That's one of my current interesting configurations. I don't need to hide the antenna. I have a dipole in the attic now, but the various RF birdies are horrendous. The quarter wave vertical outside is much quieter. The simplest thing for me at the moment is to buy a commercial Squalo type antenna and let it go at that. Thanks Wayne W5GIE /6 |
#17
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6 meter antenna ideas.....
On Wed, 10 Jul 2013 13:53:52 -0700, Wayne wrote:
The simplest thing for me at the moment is to buy a commercial Squalo type antenna and let it go at that. There's 'simple', and then there's the _amateur_ radio way. :-) http://jonz.net/W3DHJ/6mhalo.html 73 Jonesy -- Marvin L Jones | jonz | W3DHJ | linux 38.24N 104.55W | @ config.com | Jonesy | OS/2 * Killfiling google & XXXXbanter.com: jonz.net/ng.htm |
#18
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6 meter antenna ideas.....
On Thursday, June 27, 2013 3:05:51 PM UTC-4, Wayne wrote:
Needs to be either in the attic, or on a metal patio cover. A vertical on top of a 20 foot pole "might" be possible. Currently I am using a 1/4 wave vertical mag mount on top of a metal patio cover. I also have a half wave dipole in the attic. So, any ideas for something better? Wayne W5GIE Havent much been on the air since my daughter was born 18 years ago. She took over the extra bedroom or as I called it "The Shack". The roof of my house has ridges running at right angles to each other so I installed 6 meter dipoles in each one. I could select either one via a coax relay also mounted in the attic.. One thing I did notice with this setup was there was usualy very little change in signal strength regardless of whitch antenna I used.. The exception was with local contacts when the other station was directly off the end of the antenna I was using. There was only one station like this. Jimmie |
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