antenna build - Elmers Forum at eHam.net

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eHam.net Forum : Elmers : antenna build

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antenna build	Reply
by KE5MAT on January 8, 2009	Mail this to a friend!
Hi everyone im a dot scales officer and im wanting to build a inverted v antenna for our base radio. we have a 150' tower, what im wanting to do is toss a spool or rope as far up the tower as i can get it and pull my center up and tac the legs in a v away from the tower. since the tower is metal and grounded will it cause a problem? this is a 11 meter antenna im wanting to construct.

RE: antenna build	Reply
by AD4U on January 8, 2009	Mail this to a friend!
As long as none of the antenna wire touches the tower, you should not have any major problems.

RE: antenna build	Reply
by W0FM on January 8, 2009	Mail this to a friend!
Will the DOT have a problem with you erecting a CB antenna on their tower? State agencies can be pickey about these things. WØFM

RE: antenna build	Reply
by N3OX on January 8, 2009	Mail this to a friend!
"this is a 11 meter antenna im wanting to construct. " Everyone you want to contact is going to be using a vertically polarized antenna, and so you also have to do so. You probably want to build a groundplane or something. 73 Dan

RE: antenna build	Reply
by W0FM on January 8, 2009	Mail this to a friend!
And, to further clarify my post, my experience with state agencies has been that they prefer commercially produced antennas (even CB) with published specifications. Plus, a home made antenna, cross polarized from those you are trying to communicate with (mobiles) doesn't sound too exciting. I think I'd just buy a rugged, but not too expensive, commercial (vertically polarized) CB antenna if I were the DOT. Good luck. Terry, WØFM

RE: antenna build	Reply
by N8EKT on January 8, 2009	Mail this to a friend!
An inverted V would be a poor choice for CB. ANY base CB antenna would outperform it by a country mile.

RE: antenna build	Reply
by N5LRZ on January 8, 2009	Mail this to a friend!
EKT is right.... An inverted V for CB would be workable of course. But a poor choice in the long run unless you constructed a long wire inverted v antenna for the CB band--at least 3 odd lengths of quarter waves (the number of quarter waves on each leg must be of an odd nunber 3, 5, 7, 9,... this will give you a little gain. But even that would be a less than good choice. Might I suggest you obtain something like say a commercial half wave vertical that does not require a ground plane. And of course before you put the system into service check to make sure that the signal from the CB does not interfere with the primary radio systems.

RE: antenna build	Reply
by AC5UP on January 8, 2009	Mail this to a friend!
Since this will be located at a DOT weigh station I have a hunch the intent is for short range contacts. With that in mind, a modest CB vertical mounted 18' above ground would be more than adequate. If this needs to be a near-zero budget install, consider a dipole strung as a sloper. Less directional than a Vee and should put out a big signal in the parking lot.

RE: antenna build	Reply
by KC0RBX on January 8, 2009	Mail this to a friend!
You could always cheat and buy an amp!!! Just tell the state it's "a power supply"!! Hi Hi. Only, it's a power supply to the antenna!!!

RE: antenna build	Reply
by N6AJR on January 8, 2009	Mail this to a friend!
the magic number for a cb dipole is 8 feet 6 inches on each side of the center. you could mount it verticle. bring the coax away at 90 degrees to the dipole.

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