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I am a retired old geezer with way too much time on my hands for my own good.

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  • rbodell commented on rbodell's instructable Homemade TV Antenna
    Homemade TV Antenna

    I think a lot of people are getting too technical. This is made from junk. Since tv band is so wide, an inch is not going to matter. I have made these without a tape measure. I have made them out of wire taped to the ceiling, I have made them out of aluminum foil. Instead of going to the hardware store, look in your neighbors junk pile.

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  • rbodell commented on rbodell's instructable Homemade TV Antenna
    Homemade TV Antenna

    hope this helps, my math is 6th grade from 60 years ago LOL, add subtract multiply and divide. I asked a ham operator how big a circle I needed and he said 26" so I made my first out of an aluminum rim so whatever you come up with for length just bend each one in a half circle and make sure they don't electrically connect. They don't have to be mounted this way, I have nailed them to my attic floor but the higher the better. If anybody is a boater, when you swing on the anchor and the picture fades in and out, Mine didn't..https://www.instructables.com/community/How-do-you...

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  • Simple CB Base Station Antenna

    Most likely a solder joint.Check all your solder joints and lengths while you are at it. Also look for nearby metal objects close to the antenna. I just ran the ground side down inside the pvc mast. If you used a metal mast that might make a problem.

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  • rbodell commented on rbodell's instructable Homemade TV Antenna
    Homemade TV Antenna

    I have no idea why it works so good. I originally built it to get tv on my sailboat when it was anchored and swinging in the wind. My guess is that by7 being omnidirectional, it gets stations normally rejected on the side of the beam type antenna that most tv sets use.

    I have no idea why it works so good. I originally built it to get tv on my sailboat when it was anchored and swinging in the wind. My guess is that by being omnidirectional, it gets weaker stations normally rejected on the side of the beam type antenna that most tv sets use.

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  • Just the length of the wire. The pvc has nothing to do with it but hold up the wire

    Watch for aircraft LOL. You can put it as high as you want (within reason) but changing the length of the antenna changes the frequerncy. and can mess up your radio.

    cb frequencies

    The higher the frequency the shorter the antenna

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  • rbodell commented on rbodell's instructable Homemade TV Antenna

    c=pi D Cut it in halfNothing to tune. Build it like this and it works for everybody. Unless you are around salt water it really doesn't even matter what metal you use. If you are on THE top with a 360 view, you are going to get more channels than cable unless you are in the middle of the Saultan Sea. LOL. I always wanted a cb antenna on a mountain top.

    Read the directions again SLOWER. There are pictures of every step.

    That is a big frequency difference. The higher the frequency the shorter the antenna so it would be smaller diameter. TRY IT WITH YOUR FORMULA.

    it will work better if built correctly

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  • rbodell commented on andytompkins's instructable Rocket Stove

    heat raising up causes the draught that fans the fire. Ever blow on a campfire?

    I would stick with stainless. My rocket stove will melt aluninum.

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  • rbodell commented on rbodell's instructable Homemade TV antenna

    OK let me make it simple. The length of an antenna is determined by the frequency of the signal you want to transmit or receive. The frequencies closes to those that the antenna is tuned to will come in strongest and those farther away from the frequency of the antenna will be weaker. By changing the lengths of the elements of the antenna, you change the frequency it receives. If you change it enough it will no longer receive in the television band.While there is a lot of leeway in the materials, the diameter of the antenna must remain about 26 inches.

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  • rbodell commented on rbodell's instructable Homemade TV antenna

    No television is in a different frequency range. Ask your dad to explain it.

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  • It just hangs there

    200 watts on the cb bands is illegal. I prefer not to get involved in helping anybody do anything illegal. You are on your own on this one.

    By how big, you could mean the length of the antenna or the height above the ground. The diameter of the antenna is fixed. By changing the lingth of the antenna. you will change the frequency. The more you change the diameter the more the signal will be degraded.As for height above the ground, The higher the antenna. the better it will work However there are restrictions on height in some areas. If you live close to the flight path of an airport, call the airport and tell them where you live and they can advise you on height restrictions. You can also call your city and see if there are any other height restrictions for your area. If you belong to a homeowners association, check with them. Some do not permit antennas or towers. At some point you will be required to have a light on top to …

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    By how big, you could mean the length of the antenna or the height above the ground. The diameter of the antenna is fixed. By changing the lingth of the antenna. you will change the frequency. The more you change the diameter the more the signal will be degraded.As for height above the ground, The higher the antenna. the better it will work However there are restrictions on height in some areas. If you live close to the flight path of an airport, call the airport and tell them where you live and they can advise you on height restrictions. You can also call your city and see if there are any other height restrictions for your area. If you belong to a homeowners association, check with them. Some do not permit antennas or towers. At some point you will be required to have a light on top to warn aircraft of it's presence. Pretty much everywhere, you are restricted to 500 feet so it does not interfere with aircraft as they stay above 500 feet except for landing or take off..In most areas you have to have room if it falls, it will stay on your property. In other words, if you have a 200 foot tower it must be at least 200 feet from your property line. A 1 acre piece of property is approximately 200 feet by 200 feet, so you would be limited to 100 feet if it is in the center of the property.

    the center conductor of the so239 is soldered to the antenna wire going up. The outer connector of the so239 is the ground/reflector and just passes through a hole to the inside of the mast and hangs down the inside of the mast.http://www.k4icy.com/dipole_connector_so239.jpg

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