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11-12 of 12 messages
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RE: Motorcycle mobile: 1/2 or 5/8 wave antenna??
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by KA1MZY on September 27, 2009
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Has anyone found an antenna mount that dosent look like it belongs on a Mack truck? I have plenty of metal tubing ( harley Ultra ) for mounts however I refuse to use a mount with bolts sticking out of the bottom.
If so, can you drop me an email? KA1MZY AT YAHOO DOT COM
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RE: Motorcycle mobile: 1/2 or 5/8 wave antenna??
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by WB6BYU on September 28, 2009
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Take one of the existing "Mac Truck" mounts that fits
your pipes. Drill out the top holes for a larger bolt
size, and tape the bottom holes accordingly. Install the
mount in the usual manner, with the ends of the bolts
sticking out the bottom. Mark or measure the amount
sticking out, disassemble the mount, and saw off the bolts
at the desired length.
There is just too much variation in possible mounting
methods to make it commercially viable to sell mounts
specific for each situation.
And in reply to some of the other questions, my old half
wave whip (converted from a CB mag mount) is still giving
good service on a quad for Search and Rescue, after
serving several years on my car and on my backpack frame.
I've also operated bicycle mobile, which has even less
of a ground plane to work with. 5/8 wave whips do not
work well with a poor (or sloping) ground plane - even
the roof of my van is way too small to get the theoretical
gain from one. (It still may be a reasonable choice,
but it doesn't have the advertised gain over a quarter
wave whip without several wavelengths of flat ground
plane.
Probably the best signal I got from my bicycle was to
use a standard steel CB whip mounted on the rear hub
with a J-pole feed system mounted on the side of it.
But it did make it hard to get on and off the bike.
Initially I tried using a HT mounted on the handlebars
with a rubber duck: signal strength was good enough for
my commute, but the center pin on the BNC connector
wore down from the vibration and became intermittent.
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