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Author Topic: Replace Factory AM/FM antenna with 2m/440?  (Read 1761 times)
WJ4VA
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« on: March 19, 2009, 05:17:55 AM »

Does anybody know of a mobile 2m/440 antenna that will mount to the factory antenna location on a car (Ford Mustang)?
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K0BG
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« Reply #1 on: March 19, 2009, 06:18:09 AM »

No one makes a direct replacement which "looks" like a stock auto antenna.

Once upon a time, Antenna Specialists made a stealth antenna for AM/FM and high band (2 meters), but it didn't work all that well. The version for high band (70 cm) worked a little better.

V/UHF antennas, even if you used a splitter for AM/FM (there isn't any, by the way), the AM/FM reception would be rather poor.

Best thing to do? Drill a 3/4 inch hole in the center of the trunk, and install a Larsen NMO2/70BK.

Alan, KØBG
www.k0bg.com
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WJ4VA
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« Reply #2 on: March 19, 2009, 06:25:11 AM »

Im not worried about using it for AM/FM anymore, I never listen to it after getting XM.  I know the best thing is to drill a hole, but trying to avoid that and keep the car intact and looking as normal as possible.
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W3LK
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« Reply #3 on: March 19, 2009, 07:17:27 AM »

It's vehicles WITHOUT antennas that don't look "normal". Smiley

73,

Lon - W3LK
Naugatuck, Connecticut
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A smoking section in a restaurant makes as much sense as a peeing section in a swimming pool.
K0BG
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« Reply #4 on: March 19, 2009, 08:29:09 AM »

Far too much emphasis is put toward "saving the sheet metal" and trade in value. It has actually been pushed to the point that it is an urban (or urbane) myth. As a result, far too many go to great extremes to avoid drilling holes, so they resort to using clip and mag mounts. From a trade-in standpoint, both of these "devices" (or devises if you please) end up doing more damage.

If you e-mail me, I'll send you a photo of what happen when you use abbreviated mounts. It was taken at Dayton last year, and the vehicle belongs to a well-known vendor who sells clip mounts. Go figure!

Alan, KØBG
www.k0bg.com
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K5LXP
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« Reply #5 on: March 19, 2009, 08:50:11 AM »

I think this is what you're looking for:

<http://www.sti-co.com/antenna-products/covert-antennas/fender-and-roof-mount-antennas/dual-band-antennas/>

Mark K5LXP
Albuquerque, NM
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W3LK
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« Reply #6 on: March 19, 2009, 08:50:18 AM »

Patiently waiting for the photo.

73,

Lon - W3LK
Naugatuck, Connecticut
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WJ4VA
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« Reply #7 on: March 19, 2009, 09:13:04 AM »

Wow...bet that is expensive, but that would do what I wanted..assuming they could tune it for 2m.  Was really hopeing to find something that would just screw into the existing mount.  
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WW5AA
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« Reply #8 on: March 19, 2009, 09:22:09 AM »

I have discovered that after having driven the wheels off of my cars, the last thing that worried the dealer was an antenna hole (:-)

73 de Lindy
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K0BG
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« Reply #9 on: March 19, 2009, 12:26:53 PM »

I can't speak for Mark. but not only is it expensive, look at the bandwidth. This tells me right off, the antenna is less than a stellar performer.

Alan, KØBG
www.k0bg.com
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WJ4VA
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« Reply #10 on: March 19, 2009, 12:45:50 PM »

Heh..just found it online...its over $500...I think I'll pass lol.   Going to experiment a bit and see if I can machine down the threads on a center loaded 2m/440 whip I have now to the correct size for the cars mount and then hit it with an SWR analyizer while its on the car/using the factory coax...probably wont be good, but worth a shot.
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K0BG
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« Reply #11 on: March 19, 2009, 02:35:58 PM »

Well, Jesse, I wish you luck. The AM/FM coax is 93 ohm, so that's a problem in itself, especially if it just happens to be the 'correct" length.

While I admire your DYI attitude, there are a few things that just won't work, and this is one of them.

Alan, KØBG
www.k0bg.com
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WJ4VA
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« Reply #12 on: March 19, 2009, 02:59:07 PM »

Foiled again, I was wondering what the impedence of the coax was...wonder what the reasoning behind using 93 ohm is...wierd.  Hmm...well now I'm thinking of going to a junk yard and getting the fender mount and trying to remove the coax and replace it with 50ohm, and go from there....don't ever tell an engineer they can't do something, they will kill themselves trying just to prove you wrong hihi.
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KB1LKR
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« Reply #13 on: March 22, 2009, 02:02:15 PM »

93 ohm coax (e.g. RG-62 style) may have been used (vs. 75 ohm) for its low capacitance per foot: ~13pF/ft vs ~20pF/ft for RG-59 style.
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