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Author Topic: ATAS 120 Mounts  (Read 983 times)
W7QPZ
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Posts: 25




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« on: February 20, 2009, 06:45:30 PM »

Hello All
I just picked up a 1996 Jeep Grand Cherokee and would be interested in suggestions for mounting my Yaesu ATAS-120.
It has the roof rack and hitch receiver and holes are not out of consideration.

Thanks
Lou
W7QPZ
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K0BG
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Posts: 9868


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« Reply #1 on: February 21, 2009, 04:33:53 AM »

It really doesn't make much difference what you do, as far as efficiency is concerned. The ATAS's coil loss is VERY high, and unlike most HF antennas, actually exceeds the average ground loss figures by nearly 2 times. The only thing to remember, if you have erratic operation, it will be due to common mode currents flowing on the coax, as this has a direct relation to how good you mount the antenna. By the way, you can adapt the antenna to hard mounting, but honestly, it isn't worth the effort for the aforementioned reason.

You might want to go to my web site and read the Antennas, Commercial article.

Alan, KØBG
www.k0bg.com
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N4WFB
Member

Posts: 20




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« Reply #2 on: February 21, 2009, 07:48:31 AM »

Ordinarily, I would advise you to use one of the Diamond mounts and attach it to the edge of the rear liftgate.  However, I believe on that vehicle, the liftgate is fiberglass? (Correct me if I'm wrong)

If you're not concerned with height issues, you could get a CB-style SO-239 mirror/rack mount and attach to one of the roof rack rails. You could also make something from angle aluminum & some U-bolts. You will want to ensure that the rail is adequately grounded to the roof (may have to remove the rack and see how it's attached).

On my old 1991 Pathfinder, I used one of these style mounts on my rear tire carrier, using braid to make sure I had an adequate RF ground to the vehicle body. Seemed to work pretty well when I worked 40m nets. I was originally going to attach it to my roof rack, but the height was prohibitive (I occasionally have to park in a parking garage).
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N0EQ
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Posts: 74


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« Reply #3 on: February 21, 2009, 09:56:04 PM »

I have a 120 mounted in the center of the roof
of my Chev Astro Van. I believe our roof areas
are roughly similar.

5w phone, I've made contacts all over N America
while mobile from Phoenix. Canada, East Coast, Mexico,
Pac NWest, all while mobile on 5 watts, 40 and 20m.

Simple hole mounted, ran with RG58.

Make  sure it's grounded well at the base
of the antenna (scrape, sand etc the paint
where the PL259 mounts).

You'll know it's not grounded well enough if
the screwdriver function doesn't seem to work.

Craig 'Lumpy' Lemke

www.n0eq.com
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N4WFB
Member

Posts: 20




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« Reply #4 on: February 22, 2009, 11:22:37 AM »

I didn't even think of suggesting that option, Craig.  Did you have to reinforce your roof to minimize flex?
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W7QPZ
Member

Posts: 25




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« Reply #5 on: February 22, 2009, 12:06:00 PM »

Winston

I have consider that arrangement and it would work the lift gate is steel.
Some times their are innovative alternatives and this is a grate place
to find some of them.

Thank
Lou
W7QPZ
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W7QPZ
Member

Posts: 25




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« Reply #6 on: February 27, 2009, 09:32:25 PM »

Thank All

Lou
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