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Which 11 meter dipole antenna???
- Thread starter rockymount622
- Start date
Thinking about building one just to have on hand if ever needed for an emergency. I've got some so239's pvc fittings and 12 awg insulated cable to make it weatherproof. I've never built one but seems to be a simple build. Having the rigexpert analyzer will come in handy for the task.
Piece of cake to make and with your RE you can tune it to within a gnats ass........
In Rocky Mount don't make it out of copper. Or if you do, paint it green. Vertical dipoles kind of suck, only 2.15dB of gain of that theoretical antenna that radiates evenly in all directions, up down left right, etc. There is even a unit of measurement based on the gain of the dipole, dBd, decibel over dipole. The dipole = 0dBi . The advantage is they are stupid easy to make and are easy to get up in a tree. 2 9 foot lengths of something that conducts, such as wire, or even pipe, and a coax, some plastic or ceramic crap for insulators and some clothesline or paracord. I have even made them without solder just by twisting wires together to the braid and center conductor of the coax. Take a plastic coat hanger, the 2 wires and the coax, twist together, wrap it together. Tape some cordage to the ends of the wires, throw, cast or launch cord up in tree, and hoist dipole partially up tree where you can reach it, tune swr by cutting the ends and when happy, hoist the rest of the way up tree . And if you have enough coax to spare make a choke by wrapping it 5 or 6 wraps it can improve swr.
Another CB world myth. The 2.15dB gain over an isotropic only applies in free space. As soon as a dipole is hung over real earth that number goes out the window and can increase to as high as 5 to 7 dB.
I've been using a EF sleeve dipole (T2LT) for a bit now. I had an inverted Vee antenna hanging up over my shed for a few months and made great DX contacts, but locals get cross-polarized since they are vertical usually.
I made my T2LT out RG58 coax. Gotta measure out for CB/11M (around 103.2" for top and bottom sections) but here is the video I followed. Also Callum at DX Commander has a paper on the subject too. So far so good! Portable if needed, and damn near free to make if you have some coax laying around.
I made my T2LT out RG58 coax. Gotta measure out for CB/11M (around 103.2" for top and bottom sections) but here is the video I followed. Also Callum at DX Commander has a paper on the subject too. So far so good! Portable if needed, and damn near free to make if you have some coax laying around.
Its my understanding the gain of a 1/2 dipole typically increases in a horizontal configuration, not vertical. Something to do with capacitance between antenna and the dirt and it acts as a reflector and I don't think it's even that much unless your talking about a 3/4 wave dipole.
I just take a 102" whip, a rail mount and a 102" segment of 1/4" aluminum stock. That dipole gives me an SWR of 1.55:1. It has talked from Puerto Rico to Hawaii with less than ten watts of output from my Cherokee AH 100 SSB walkie talkie.
Where is Rocky Mount, HOA gated cesspool? No offense intended; but, what does that mean? Aluminum only?
Would you mind showing the beast you speak of? That sounds like an antenna project to tinker with.