I have a question to all those out there....."Has Anyone Ever Made 11 Meter Dipoles And Used Them ?"....Would like to hear if anyone has made them and used them...... I did back in the day had 2 one going "North And South One Going East And West" had pretty good luck with them at 35 feet to feed point.
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Dipole Antenna
- Thread starter wildchild455
- Start date
Have one in my attic in a fairly wide inverted V. Have made a few contacts on it and it works...but it’s in my attic.
The ones I had up did better than I thought they would inverted V is the way I had mine. Thinking about getting a couple of baluns and build 2 more
Still have my homebrew 11m dipole. It works well, but my homebrew StarBuster works better at 37 foot.
Yep, I made one in the '80's and got great results from my limited expense. I still have it in my garage should I want to use it again
BJ radionut
Supporting Member and 6m addict
http://www.66pacific.com/calculators/dipole-antenna-length-calculator.aspx
http://www.66pacific.com/calculators/full-wave-loop-antenna-calculator.aspx
Full-wave loop antennas can be large at lower frequencies, but they are quieter than dipoles and have more gain broadside to the plane of the loop.
Many of the antennas we use are designed to be close to 50 ohms (SWR = 1) when they are resonant. In this case, the SWR is a good indicator that the antenna is resonant, which is why most hams associate low SWR with resonance. Low SWR does not tell us anything about how well the antenna is working (antenna efficiency).
Let’s look at the classic center-fed half-wave dipole in free space.
At the resonant frequency, the antenna has an impedance of 73 Ω, purely resistive. (Best efficiency)
The SWR can be calculated by taking the ratio of the impedance to 50 ohms, giving SWR = 73/50 = 1.5.
Note that the SWR is not equal to 1 at resonance, it is a bit higher.
http://www.66pacific.com/calculators/full-wave-loop-antenna-calculator.aspx
Full-wave loop antennas can be large at lower frequencies, but they are quieter than dipoles and have more gain broadside to the plane of the loop.
Many of the antennas we use are designed to be close to 50 ohms (SWR = 1) when they are resonant. In this case, the SWR is a good indicator that the antenna is resonant, which is why most hams associate low SWR with resonance. Low SWR does not tell us anything about how well the antenna is working (antenna efficiency).
Let’s look at the classic center-fed half-wave dipole in free space.
At the resonant frequency, the antenna has an impedance of 73 Ω, purely resistive. (Best efficiency)
The SWR can be calculated by taking the ratio of the impedance to 50 ohms, giving SWR = 73/50 = 1.5.
Note that the SWR is not equal to 1 at resonance, it is a bit higher.
Mine is in that ball park of 110 degrees I’d guess and it won’t even wiggle the reflect power needle...and now I know why!
I played with another that is straight, and fed with 75ohm coax...it also shows an excellent match.
For those wondering about inverted V lowering the ends in a upside down V pattern will give you a bit more omni-directional pattern. It does create a better SWR match by lowering the ends. Easy to build. Way cheap to build.
Another thing I’ve noticed, or maybe I am crazy...but my inverted V works pretty well talking to local verticals.
Yes, I ran mine that way for a long time. I was surprised how well it worked compared to my vertical. I might change back one of these days.
Yep. Even made one using two 4' Firestiks. Horizontal and Inverted V. Both worked good.
A little humor but true story.
No joking! How about a quad antenna made with bamboo rods and #10 gauge solid copper wire? Back in '75 I helped a friend build a quad beam using bamboo rods and copper wire. We all laughed at him when he got on channel 11 asking for volunteers to help him build and assemble the antenna on his two-story roofed house. That was about the same time the Astroplane and Big Stick were becoming popular. I think the boom was about ten-feet long and the four + (radials ?) pieces were about eight-feet long and the copper wire formed the "box". It looked funny as h*** because the bamboo wasn't as straight as aluminum rods and the copper wire wasn't too straight because it was to stiff to pull the kinks out without bending the bamboo rods. Maybe he should have used 14 gauge wire.
He saved a lot of money by building the antenna out of bamboo until his wife returned from the store and tried to watch TV, ha! ha! ha! His wife gave him two choices. Put the TV antenna rotor back or sign-up and pay for Cable TV. Back in '75 the CB craze was booming and he selected option number two and signed-up for Cable TV.
I bet he got the rotor back on the TV Antenna.....Thats what I used was 14 guage solid insulated wire for my dipoles