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Author Topic: Antenna, mounting location & SWR meter  (Read 1594 times)
KC9NPT
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« on: June 24, 2011, 06:20:30 AM »

I have a Yaesu 2800m in a Jeep Wrangler with a Tram 1180 mounted by right taillight. Don't think I'm transmitting as well as I should. Can you make any suggestions as to antenna and mounting location changes I should make? Can go up to a 4' antenna and still fit in garage. This would give me about 15" above soft top. Can a cb swr meter be used? Have a motorola s1352a meter.

Thanks for the replies.
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K0BG
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« Reply #1 on: June 24, 2011, 12:45:56 PM »

If it were mine, I'd use an NMO hood seam mount (Rams, and Jeeps use the same mount), and a Larsen NMO2/70. This will put the antenna clear of the body work, and thus will reduce capacitive loading of the antenna.
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M6GOM
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« Reply #2 on: June 25, 2011, 08:56:52 AM »

And no, you cannot use a CB SWR meter.
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KC9NPT
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« Reply #3 on: June 28, 2011, 10:31:49 AM »

This is what I currently have and I want to see if there's a better way.

http://i55.tinypic.com/4jwb6f.jpg

Thanks
« Last Edit: June 28, 2011, 10:35:45 AM by KC9NPT » Logged
G8YMW
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« Reply #4 on: June 29, 2011, 03:20:14 PM »

Looking at what you have and if I was in that situation. Id go for a 1/4 wave (Thin and very springy) and mounted on top.. Where you have your aerial, the roll bar will detune it badly. VHF rule one, get it right up in the clear.
 
73 de Tony
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73 details Tony
Sent by WW2 Royal Navy signal lamp
KC9NPT
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« Reply #5 on: June 30, 2011, 06:20:35 AM »

It's a soft top, so can't do that!!!  Would it help to move toward center of tailgate.
K0BG suggested the Larsen mount which I think is the TMB34d for the hood area, which I think would put it over the right front fender.
« Last Edit: June 30, 2011, 06:22:39 AM by KC9NPT » Logged
K0BG
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« Reply #6 on: June 30, 2011, 11:45:33 AM »

That is correct.

You can buy special mounts which fir the hood seam on a Ram or Jeep. They have a 3/4 inch hole meant specially for an NMO mount.
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KC9NPT
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« Reply #7 on: June 30, 2011, 12:58:06 PM »

Thanks, Alan

thought that was the one you meant. looks like a flat plate that extends over front fender.
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K0BG
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« Reply #8 on: June 30, 2011, 02:22:34 PM »

Correct. As you're aware, the Jeep has a different hood seam than just about every other vehicle out there. The only trouble with hood, and trunk seam mounts, is clearance. You cannot use one on most sedans made after 2009 because there isn't enough clearance. I just looked at a new Acura TL, and there isn't much more room than 2 or 3 business cards. Amazing!
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