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Discussion in 'Amateur Radio Antennas' started by unit_399, Jul 11, 2008.
If you try to ground the antenna mounted on fiberglass, you're going to have alot of work for something that will break and look ugly.
I think the windshield supported by metal which is part of the chassis.
The rear of the vehicle may be similar.
The counterpoise is important since you want to run 300 watts.
If I use the "X" approach, should I connect the antenna base to the Cat battery ground or just leave it grounded to the copper flashing?
I really don't care about "ugly" because a Daihatsu F50 ain't gonna win no beauty contest anyway.
yeah, i can just picture that.
the antenna is connected to the center terminal of the antenna mount which is isolated from the ground plane. the ground plane (copper flashing or adhesive backed aluminum 2" wide ground plane tape) is connected to the external shell of the antenna mount which is isolated from the antenna connection contained in the center of the mount. the antenna is only ever connected to the ground plane in a shunt feed network, nothing you have to concern yourself with here.
I think it's a fairly safe assumption that the vertical radiating element wasn't meant to be connected to a battery, wouldn't you say, freecell? I sort of doubt if he meant it that way, don't you think? At least, I took it to mean the 'groundplane' thingy, not the vertical whip thingy, and that was my intent. Of course, that was an assumption on my part, so I could certainly have been wrong.
I guess I should make certain that my answer isn't misunderstood. So, change the word "antenna" to the particular part of the antenna usually called the groundplane. I am terribly sorry if it was misunderstood.
Excuse me while I mop up the sarcasm that dripped off of this post. Have to clean that stuff up pretty quick, it makes a terrible mess if you don't...
antenna base to the battery ground." I was trying to ask if connecting the ground side of the antenna mount to the steel car body was a good thing or not, but I didn't do a very good job of saying it. Yesterday, I made an "X"-shaped groundplane. Items that are commonplace in the US (like copper flashing and aluminum tape) aren't available locally here, so I ran 4 lengths of braid inside the top from the antenna mount to each corner and down to the main body where I grounded it. My SWR is 1.4:1 on 26.955 which is plenty acceptable. I drove to the village this morning and talked with my wife at the ranch (about 22 km away) without any problem. Thanks to everyone for all your help.
say what you mean and mean what you say. you never know who you're dealing with and you don't know what they already know and what they don't.
accurate speaking (or writing) is a sign of accurate thinking.
"Connect the antenna to the 'groundplane'........"
No, and an antenna is NOT connected through the vehicle ground, the antenna is "mirrored" via capacitance to the vehicle ground, not to be confused with a "hard" connection. only in a shunt feed arrangement is there any "hard" connection between the antenna and ground.