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Author Topic: 6meter whip question  (Read 1276 times)
VE4AAZ
Member

Posts: 60




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« on: March 06, 2004, 09:42:01 PM »

On my 1/2 ton silverado I operate a iron horse IHF 6 antenna . Physically it is 36 inches and is on a stake pocket mount fed with RG-8. The SWR is 1.2 to 1 and the coverage is good up to 50.500. I mostly use it when the band opens up.I recently purchased a couple of brand new 11 meter Black Antenna Specialist fiberglass  whips at an estate sale and figured I would cut one of the black whips to 54" and improve my radiation field strength.Does the theory of building  the antenna to a  physical 1/4 length have merit.

Bill
VE4AAZ
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AA4PB
Member

Posts: 15065




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« Reply #1 on: March 06, 2004, 11:05:02 PM »

All else being equal, a full sized 1/4-wavelength whip will be more efficient than a shorter, loaded whip. What I don't know is what is inside the fiberglass CB whip you plan on cutting. If it's a staight, heavy guage wire then you should be okay. Most fiberglass CB whips however are loaded and have wire wound around the outside of the fiberglass. Cutting one of these to a length of 54-inches will not work because it will not be resonant on 6M. You'd be better off to get a stainless 102-inch whip and cut it to 54-inches.

Most 6M SSB work is done with horizontally polarized antennas. If you are really into 6M then you might consider one of the horizontally polarized loop antennas (they used to be called a halo). In theory, the loss due to cross polarization is around 20dB. With skip you quite often will not see that much difference because the polarization gets changed by the propogation but with locals the loss is quite sizable.
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Bob  AA4PB
Garrisonville, VA
WB6BYU
Member

Posts: 18516




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« Reply #2 on: March 18, 2004, 05:59:46 PM »

The CB whips are typically wire wound on a fibreglass
rod and covered with heat shrink tubing.  If the wire
is straight or slightly wound for the bottom 54" it
may work as you described.  Otherwise you will want
to make it that way.  You MIGHT be able to pull the
extra wire out from under the heatshrink, otherwise
just slit the heatshrink from the section of the
antenna where the wire is coiled, straighten the wire,
cut to 54", and put a new layer of heat shrink on it.
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