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Search results

  1. V

    Dual polarity quad...possible to build?

    Have you considered circular polarity? It would use crossed dipoles fed 90 degrees out of phase. The reflector and directors can be regular square loops. The advantage to circular would be during skip conditions when the signal polarity could be rapidly changing, the CP will respond much...
  2. V

    My coax debate

    Wayne worked with MBS for 27 years and lived at the AM site most of that time. Long hair Greg owned the boat. Are you thinking Mike Maxwell from MBS? He was there only a couple of years.
  3. V

    Help with Antenna Trimming

    It's unlikely the antenna will work on 70cm as the coil is use for matching at 2 meters. If you want to mess around with it, take off the original stainless steel whip and put on a piece of 12 gauge wire. Trim and cut the wire and experiment. If you find something that works use the wire as a...
  4. V

    Coax length.. does it matter or not

    Quarter wave lines are very often used for impedance matching devices. Multiple quarter wave sections, each step with a different impedance is very common in broadcast antennas. One antenna I'm familiar with uses 36 dipoles. They are fed from a 6-inch main input power divider to six secondary...
  5. V

    Grounding: Crossing Exterior Architectural Features

    Could you get the wire inside the pipe coming down the middle?
  6. V

    I finally ordered the new tower today.

    It's a Zhumell Z12 reflector with a 12 inch mirror. 1500mm focal length. I also have a Bushnell 4.5 inch reflector that is useless with its supplied mount. I hope it will be usable after it has a new mount built. I have a laser collimator that could bring your scope back into usable...
  7. V

    I finally ordered the new tower today.

    The weather hasn't been cooperative for me either. I bought a telescope last weekend. Just got it working today. Set it up and had it pointed at Orion at dusk. Shortly afterwards the clouds moved in. Hard to look at the sky when the stars are blinking on and off as the clouds blow through...
  8. V

    I finally ordered the new tower today.

    Let me know if you need a hand with things. I'm on vacation until 2 April. Supposed to get cold again, I took the wrong week off...
  9. V

    Coax And Lightning?

    Those surge protectors limit the surge travelling along the center conductor of the coaxial cable. They will not control or direct ground currents. I'd consider them only as supplemental protection. Without correcting the overall installation, including proper routing of transmission lines...
  10. V

    Coax And Lightning?

    Those may be ok for supplemental protection, but you should still have the overall site grounding and bonding taken care of first and foremost. An easy option that you could build yourself uses a Tee connector and a piece of cable to place the entire antenna at DC ground. Using RG8 or RG58...
  11. V

    Coax And Lightning?

    The ground wire will go back to the pole. This is why you should have the tower and transmission lines bonded to the AC entrance ground and the RF entrance as close by as possible. The TV cable, satellite, telephone, and other lines should be treated in much the same way as RF lines from the...
  12. V

    Coax And Lightning?

    Ideally the coax would enter the house at the AC entrance. Run a heavy gauge wire from the house ground to bond it to the antenna / tower ground. Bond the coax to the house ground where it enters the house. Doing this will greatly limit ground currents flowing along the coax and through radio...
  13. V

    ground rods ... don't look if you don't like links ;)

    Last time I drove ground rods they came from a surplus store. Copper clad steel. You can order tinned copper wire from electrical supply stores. Perhaps they could supply tinned copper plated ground rods as well.
  14. V

    Coax And Lightning?

    I'm not calling you stupid! You're right to ask questions and try to learn. The stupid ones are those who have the information in front of them and are too pig headed to read and accept it. Read through the grounding PDF as well as the techniques mentioned in its links. There are simple...