I heard that there is a reason to run the coax on the outside of the table as running it inside can create some issues. I just don't recall what it might have been or if the warning was based on fact or just anecdotal comments.
Mike W0MU W0MU-1 CC Cluster w0mu.net On 4/15/2012 10:28 AM, Jim Brown wrote: > On 4/15/2012 8:49 AM, Wayne Rogers wrote: >> Also - on the antenna installation. Typically the two meter vertical's >> outer conductor will be grounded to the tower at the base of the two meter >> antenna. I could also keep the two meter antenna insulted from the tower >> for its entire length up to the lightning protector just before it enters >> the house. What's the recommended practice? Ideas? > First, always run rotor cables and coax for antennas mounted to the > tower INSIDE the tower. This allows skin effect to minimize 160M current > on those cables. Second, proper bonding of the coax shield to the tower > top and bottom is good practice for lightning. Third, coming away from > the base of the tower, wind as many turns as you can of each cable > through at least one #31 toroid. This prevents these cables from > becoming part of the radial system. > > Ferrite beads clamped onto a cable are next to useless on the HF bands > because they are inductive, not resistive, so all they do is TUNE the > cable to which they are attached. > > If the tower is very close to the house, it should be bonded to the > combination of all grounds in the house, which, MUST be bonded > together. That includes power entry, telephone entrance, cable TV, > satellite dish, ham shack, etc. If the tower is distant from the house, > only the cables coming from the tower should be bonded, not the tower > itself. > > 73, Jim Brown K9YC > _______________________________________________ > UR RST IS ... ... ..9 QSB QSB - hw? BK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK