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Saturday September 04, 2010
 

Coax, Rotor Cable & Wire


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HAM Antenna Cable Tips:
Whether you want to install an antenna on your roof, on a pole, or in your attic, using the right kind of cable is crucial to the performance of our HAM station. The two types of wire commonly used to connect an antenna to a transceiver are 450 ohm ladder line and 50 ohm coax cable.  Ladder-line is a flat wire, sometimes called "twin-lead."  For the best performance and reliability, use high-quality RG-8X, RG8U (for HF legal limit), or in the case of very high power,and VHF, use RG213.

  • Antenna cable should run as directly as possible from the antenna, or antenna BALUN to the transceiver or tuner.
  • Avoid sharp bends in the cable as they can impair performance by crimping or creating a TDR lump or impedance change.
  • For antennas installed outdoors (including the roof), run the cable into the house through an attic or basement entry; never run the cable through a window or door.
  • Outdoor antennas should be grounded for lightning protection.  Use a gas-stop or gap type 7516 grounding (lightning) block where the antenna cable enters the house, transceiver, or tuner.  Run a wire from the grounding screw or tap, to your station's ground rod.  This is not only an important safety consideration but also a NEC code requirement
  • Outdoor connections should be protected from exposure to the elements by applying CS-104 coax seal to prevent oxidation.



 
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