Topband: Topband Tower Antenna With Two meter Vertical

[W0MU Mike Fatchett]

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
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