Part15

License Free, legal, low-power radio broadcasting

Outer Extreme

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Part 15ers crave for a new micro-thought about stepping up the efficiency of their miniature radio signals. We end up considering every possible combination, based on those sacred rules we follow.

Part 15ers crave for a new micro-thought about stepping up the efficiency of their miniature radio signals. We end up considering every possible combination, based on those sacred rules we follow.

So, if we fed the transmitter into a 3-meter transmission line to get the signal outdoors and away from the wall, at the outside-end you could attach to… nothing.

Would it work?

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  1. Some Guys Will Try Anything-That’s How New Stuff is made
    You need something out there to radiate the signal assuming that your cable is coax. Even a balanced ladder line cable probably wouldn’t radiate enough to matter.

    You might try the old reverse connection leaky coax trick. Hook the center conductor to ground and the shield to the transmitter output. It might radiate a short distance.

    Maybe if you mounted the transmitter on the inside of the outside wall and ran the 3 meter antenna wire through a hole and somehow suspended it…

    I read an article where a Talking House transmitter was mounted in the rafters and the antenna rod stuck up through a hole in the roof.

    • I’m fixing hole…..
      I’m fixing a hole where the rain gets in
      And stops my mind from wandering
      Where it will go – The Beatles

      I understand the idea behind putting a hole in the roof for antennas to poke thru…..but like the lyrics i am quoting wouldn’t this solution cause a problem later on? I just cringe a little bit when I read about holes in a roof and have visions of a old house i owned years ago that built in the 1800’s. Behind the house was a tree that was probably there as long as the house. It was a monster and took two days to remove since it was between the house and a workshop. The reason we removed the tree was it had grown so big that the branches had actually touched the top of the house and ripped the roof apart. This i found out the hard way when a heavy rain storm caused a leak in the pantry.

      In the end the cost was about $1200 to replace the damaged roof and have the monster maple tree removed from the yard.

      I don’t want to be negative here, i am just wondering if cutting into your roof wouldnt cause several dollars worth of damage and a big headache? How about a wall mount for masts, Radio Shack used to sell these, you would mount two brackets to the outside wall of your house and clamp a mast pipe to it. What if you were to do this but instead of just clamping the mast/antenna (metal to metal) place some kind of insulator between the clamps and mast? Then run your wire thru a feed through tube in the wall so that the weather will stay out but your signal would reach outside to the antenna.

      Just thinking out loud here. Hope everyone is doing well.

      • This Keeps My Mind From Wandering, Where It Will Go
        In the article I mentioned, he used a plumbing rubber boot to seal around the antenna rod.

        Clamps on the side of the house could work if, like you said, you insulate the antenna rod (pipe) from the clamps. You could probably cut a slot in a short piece of PVC and slip it over the pipe so the U-bolt would pinch tight holding the antenna pipe in place. Just need the right combination of PVC and pipe sizes.

        I made one to hold an aluminum antenna tube out of PVC tailstock fittings. You know, the part that seals up the short pipe from the sink to the drain line. I put one on each end of a 2 foot piece of PVC. Slid the antenna tube through them and tightened ’em down. Then the PVC could be clamped to whatever. Fortunately the antenna tube was 1 1/4 OD which is the same as a sink drain tailstock.

        Maybe one of those collapsable closet rods would be about the right diameter. It would even be adjustable in lenght for tunning…