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6 mtr antenna help
Looking to build a decent 6 mtr antenna ... probably a loop...
space no problem indoor out out... want to hit local repeater 50 miles away... Have you had experience and can you recommend a good one..!!! THX in advance Tony |
Most if not all Six meter repeaters use vertical antennas -- hence vertical
polarization When looking at loops -- choose a suitable one. Lots of 6M antenna projects at AC6V's site -- URL: http://ac6v.com/antprojects.htm#6M -- The Anon Keyboard I doubt, therefore I might be "tonester" wrote in message ... Looking to build a decent 6 mtr antenna ... probably a loop... space no problem indoor out out... want to hit local repeater 50 miles away... Have you had experience and can you recommend a good one..!!! THX in advance Tony |
"tonester" wrote in message ... Looking to build a decent 6 mtr antenna ... probably a loop... space no problem indoor out out... want to hit local repeater 50 miles away... Have you had experience and can you recommend a good one..!!! THX in advance Tony I don't think you want horizontal polarization for a repeater- everyone (except ATV) I am familiar with is vertically polarized. Dale W4OP |
Tony wrote:
"Looking to build a decent 6 mtr antenna... probably a loop... Space no problem indoor or out..." I suppose vertical polarization is used in the repeater you would like to reach 50 miles away, so that it is compatible with mobiles. Hopefully your repeater antenna is at high altitude on a TV tower or some such lofty perch. You need about 1250 feet of elevation to provide a horizon 50 miles away. Height of the station antenna on your end reduces the repeater antenna height required. A vertical loop antenna is fed in the middle of a vertical side and makes an array of two 1/4-wave vertical dipoles, separated in space by 1/4-wave. It has slightly more gain in the direction of the plane of the vertical sides. The ground quality surrounding the antenna affects its performance but radials are not worthwhile. There is a slight gain versus a groundplane antenna. In free space, the radiation resistance of a square quad loop of one wavelength circumference is about 120 ohms. It would work best with balanced feed. ON4UN`s "Low-Band DXing" has a chapter "Large Loop Antennas" which would likely be worth a look. Best regards, Richard Harrison, KB5WZI |
On Tue, 16 Nov 2004 18:44:38 +0000, tonester
wrote: Looking to build a decent 6 mtr antenna ... probably a loop... space no problem indoor out out... want to hit local repeater 50 miles away... Depends on how high the repeater antenna is and how much power you're running -- to hit a repeater at that distance your best bet is probably a small beam, regardless of polarization issues. A beam would also be your best bet for general 6 meter work. Six meter beams aren't all that expensive -- if you really want to homebrew one, do a google search. bob k5qwg Have you had experience and can you recommend a good one..!!! THX in advance Tony |
Someone wrote
"your best bet is probably a small beam, regardless of polarization issues. However, a yagi can be rotated 90 deg to have vertical polarization thereby avoiding the cross polarization attenuation which can be significant. Just be careful of interaction between the yagi elements and the mast. AND A quad can be fed to have vertical polarization -- The Anon Keyboard I doubt, therefore I might be "Bob Miller" wrote in message ... On Tue, 16 Nov 2004 18:44:38 +0000, tonester wrote: Looking to build a decent 6 mtr antenna ... probably a loop... space no problem indoor out out... want to hit local repeater 50 miles away... Depends on how high the repeater antenna is and how much power you're running -- to hit a repeater at that distance your best bet is probably a small beam, regardless of polarization issues. A beam would also be your best bet for general 6 meter work. Six meter beams aren't all that expensive -- if you really want to homebrew one, do a google search. bob k5qwg Have you had experience and can you recommend a good one..!!! THX in advance Tony |
From URL:
http://www.astronantennas.com/polarization.html On line-of-sight (LOS) paths, it is most important that the polarization of the antennas at both ends of the path use the same polarization. In a linearly polarized system, a misalignment of polarization of 45 degrees will degrade the signal up to 3 dB and if misaligned 90 degrees the attenuation can be 20 dB or more. -- The Anon Keyboard I doubt, therefore I might be Someone wrote "your best bet is probably a small beam, regardless of polarization issues. "Keyboard In The Wilderness" wrote in message news:jTvmd.145327$hj.28281@fed1read07... Replied However, a yagi can be rotated 90 deg to have vertical polarization thereby avoiding the cross polarization attenuation which can be significant. Just be careful of interaction between the yagi elements and the mast. AND A quad can be fed to have vertical polarization -- The Anon Keyboard I doubt, therefore I might be "Bob Miller" wrote in message ... On Tue, 16 Nov 2004 18:44:38 +0000, tonester wrote: Looking to build a decent 6 mtr antenna ... probably a loop... space no problem indoor out out... want to hit local repeater 50 miles away... Depends on how high the repeater antenna is and how much power you're running -- to hit a repeater at that distance your best bet is probably a small beam, regardless of polarization issues. A beam would also be your best bet for general 6 meter work. Six meter beams aren't all that expensive -- if you really want to homebrew one, do a google search. bob k5qwg Have you had experience and can you recommend a good one..!!! THX in advance Tony |
Difficult to answer your question until you say what Tx power you intend to
use and the sort of obstructions along the radio path. ================================= want to hit local repeater 50 miles away... |
Looking to build a decent 6 mtr antenna ... probably a loop...
space no problem indoor out out... want to hit local repeater 50 miles away... ================================== The line-of-sight performance on a 50 mile path, at 50 MHz, with a Tx power of 50 watts and similarly polarised half-wave dipoles, is approx as follows - Tx to Rx transmission loss = 100 dB. 50-ohm Rx input volts = 500 micro-volts. Equivalent to S9 + 20 dB. Which is a very loud signal level. However, due to Earth curvature, at 50 MHz the radio horizon at ground level is only about 14 miles. And as Richard says, at least one of the Tx and Rx antennas must be elevated to more than 1250 feet above the other to achieve a line-of-sight condition without any high ground obstructions in between. Attenuation beyond the horizon increases rapidly due to diffraction. But you might just about make it with 50 watts and a 3-element vertical antenna. (A dipole with 1 reflector + 1 director.) (Or a dipole + 2 directors.) (Or you could try just 1 director.) Expect some fading depending on weather conditions. On the other hand, if you were lucky when you chose your QTH, you may come booming through. Enjoy yourself experimenting with a vertical antenna as high as possible above the roof tops. ---- Reg, G4FGQ |
Your main aim with this antenna - is to get it as HIGH as you can and use
good feedline Use a 5/8-wave vertical - or a quad (side fed) "tonester" wrote in message ... Looking to build a decent 6 mtr antenna ... probably a loop... space no problem indoor out out... want to hit local repeater 50 miles away... Have you had experience and can you recommend a good one..!!! THX in advance Tony --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.788 / Virus Database: 533 - Release Date: 11/1/2004 |
Depends on how high the repeater antenna is and how much power you're running -- to hit a repeater at that distance your best bet is probably a small beam, regardless of polarization issues. ********* The main thing with the antenna is being able the "hear" the repeater, so as long as his power equals or exceeds the repeater's power, if he can hear it, he can use it. ********** A beam would also be your best bet for general 6 meter work. ****** amen ****** Six meter beams aren't all that expensive -- if you really want to homebrew one, do a google search. ***** Its more fun to build it yourself ********* --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.788 / Virus Database: 533 - Release Date: 11/1/2004 |
Hey! When did they start sending ATV on 6M? I've been missing out!
Oh, I think you are referring to REPEATERS in general...that most, if not all, repeaters run vertical polarization except ATV repeaters...that's a true statement... Scott Dale Parfitt wrote: "tonester" wrote in message ... Looking to build a decent 6 mtr antenna ... probably a loop... space no problem indoor out out... want to hit local repeater 50 miles away... Have you had experience and can you recommend a good one..!!! THX in advance Tony I don't think you want horizontal polarization for a repeater- everyone (except ATV) I am familiar with is vertically polarized. Dale W4OP |
"tonester" wrote in message ... Looking to build a decent 6 mtr antenna ... probably a loop... space no problem indoor out out... want to hit local repeater 50 miles away... Have you had experience and can you recommend a good one..!!! THX in advance Tony Tony, Not too many people use 6m FM, but on SSB, If both ends are running 50W to a 6 element beam at 50 feet, the probability of being able to work out to 100 miles is essentially 100%. Tam/WB2TT |
Golly there are over 200 6M repeaters in California -- all using FM
URL: http://www.we6r.com/ And the original question was: Looking to build a decent 6 mtr antenna ... probably a loop... space no problem indoor out out... want to hit local repeater 50 miles away... Have you had experience and can you recommend a good one..!!! THX in advanceTony --------------------- The Anon Keyboard I doubt, therefore I might be "Tam/WB2TT" wrote in message ... Tony, Not too many people use 6m FM, but on SSB, If both ends are running 50W to a 6 element beam at 50 feet, the probability of being able to work out to 100 miles is essentially 100%. Tam/WB2TT |
i would suggest to build a Jpole for 6 meters FM work at about 40 feet
would do nicely www.ac6v.com should hav e plans for a jpole if not do a google search for a jpole tonester wrote: Looking to build a decent 6 mtr antenna ... probably a loop... space no problem indoor out out... want to hit local repeater 50 miles away... Have you had experience and can you recommend a good one..!!! THX in advance Tony |
Not too many people use 6m FM, but on SSB, If both ends are running 50W
to a 6 element beam at 50 feet, the probability of being able to work out to 100 miles is essentially 100%. Tam/WB2TT Is that a shorter call Tam? Dale W4OP |
"Keyboard In The Wilderness" wrote in message news:G4Lmd.145403$hj.34869@fed1read07... Golly there are over 200 6M repeaters in California -- all using FM URL: http://www.we6r.com/ And the original question was: Looking to build a decent 6 mtr antenna ... probably a loop... space no problem indoor out out... want to hit local repeater 50 miles away... Have you had experience and can you recommend a good one..!!! THX in advanceTony --------------------- The Anon Keyboard I doubt, therefore I might be "Tam/WB2TT" wrote in message ... Tony, Not too many people use 6m FM, but on SSB, If both ends are running 50W to a 6 element beam at 50 feet, the probability of being able to work out to 100 miles is essentially 100%. Tam/WB2TT This is channel 2 land. Essentially no 6 m FM. Why don't you try a simple vertical first, and figure out how much more gain you are going to need, if any. I just mentioned the SSB figures to show that you don't need to have your antenna at 1000 feet. Tam/WB2TT |
"Dale Parfitt" wrote in message news:RFMmd.13730$d96.1447@trnddc01... Not too many people use 6m FM, but on SSB, If both ends are running 50W to a 6 element beam at 50 feet, the probability of being able to work out to 100 miles is essentially 100%. Tam/WB2TT Is that a shorter call Tam? Dale W4OP Dale, Not sure I understand the question, but its a vanity call. Tam/WB2TT |
Tam if you are New Jersey -- there are about thirty 6M repeaters in NJ to
say nothing of 6M repeaters in adjacent states See URL: http://www.artscipub.com/repeaters/s...New-Jersey.asp Be sure to see all 10 pages And my area is channel 2 land as well --- if you mean TV channel 2, and I have no problem with TVI And after all these posts on "6M antenna help" I believe the original poster is in the UK and is limited to 10 watts as Tony is an M3 class license !!!!! But was an interesting thread of posts -- The Anon Keyboard I doubt, therefore I might be "Tam/WB2TT" wrote in message ... "Keyboard In The Wilderness" wrote in message news:G4Lmd.145403$hj.34869@fed1read07... Golly there are over 200 6M repeaters in California -- all using FM URL: http://www.we6r.com/ And the original question was: Looking to build a decent 6 mtr antenna ... probably a loop... space no problem indoor out out... want to hit local repeater 50 miles away... Have you had experience and can you recommend a good one..!!! THX in advanceTony --------------------- The Anon Keyboard I doubt, therefore I might be "Tam/WB2TT" wrote in message ... Tony, Not too many people use 6m FM, but on SSB, If both ends are running 50W to a 6 element beam at 50 feet, the probability of being able to work out to 100 miles is essentially 100%. Tam/WB2TT This is channel 2 land. Essentially no 6 m FM. Why don't you try a simple vertical first, and figure out how much more gain you are going to need, if any. I just mentioned the SSB figures to show that you don't need to have your antenna at 1000 feet. Tam/WB2TT |
hi tony,
take a look at this desigh, the Moxon for 6m ! http://www.cebik.com/6m.html Less space but almost the same gain as the Yagi horizontal or vertical no problem. regards, jj tonester wrote: Looking to build a decent 6 mtr antenna ... probably a loop... space no problem indoor out out... want to hit local repeater 50 miles away... Have you had experience and can you recommend a good one..!!! THX in advance Tony |
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