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Is this a Dipole Antenna?

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Luis_C

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My dad found this antenna with Belden 9258 Coax with a N-male and TNC connector, it is about 25 feet. He told me that probably it was used for UHF transmission.



I would like to know what kind it is, and for what do you think it was designed and if it should improve a bit my airband reception. I'm using a Pro-95 Scanner with the stock antenna. I'm about 6.30 Miles from the airport, I can pickup the tower without problems with the stock antenna, lucky me, I would say. :) I can hear aircrafts when they are approvaching from about 7 miles of the airport, and some big aircrafts from about 30 miles, (well, they say they are at that distance of the airport.) :) but it's hard to understand what they are saying when they are at 30 miles.

I removed the TNC connector and got one of those solderless BNC connectors from Radio Shack, I would have liked it to be solder, I would have gotten the tools somehow for do it.

With this antenna, I have mounted it a bit high and in vertical position. (Maybe this antenna is designed for horizontal position? (Like about 2 meters) I haven't been able to mount it on the roof. (I have first to get an idea of how to keep it firm) and sometimes I think the signals are a bit more stronger, but not a real difference. Do you think it should have made a big difference? I know there's many things to include in the equation, but maybe there's a general answer? Maybe this coax is so crappy or something?

The cable is RG-8X the cable but doesn't fit the connector, because the cable is a bit smaller, but I put some tape in the cable for make it a bit wider, just like if it were a RG-58 cable, and while I was doing it, I was monitoring the police just to check out how if the contact was ok, I made my best and seems decent.

Thanks.
 

ka3jjz

Wiki Admin Emeritus
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Bowie, Md.
As short as that horizontal element is, my guess would be that this antenna is a UHF antenna; probably won't work well for civ air VHF. We've got a few homebrew designs that with a little work on the formula, will work just fine on civ air VHF on our scanner antennas wiki page, depending on height and any obstacles. A plain old ground plane, mounted nice and high and fed with the correct coax, will do just fine.

73s Mike
 

BMT

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One thing about antenna's. You will never know if you don't try!!

BMT
 

Luis_C

Member
Joined
Jun 14, 2006
Messages
77
Location
Hermosillo, Sonora, México
ka3jjz said:
As short as that horizontal element is, my guess would be that this antenna is a UHF antenna; probably won't work well for civ air VHF. We've got a few homebrew designs that with a little work on the formula, will work just fine on civ air VHF on our scanner antennas wiki page, depending on height and any obstacles. A plain old ground plane, mounted nice and high and fed with the correct coax, will do just fine.

73s Mike
Checked it out, if I can get a N-Male with a Square Flange I'll try to do it. Doesn't look too hard. Thanks :)

radio10-8 said:
Can I see another picture with a different view? Do you see any manufacturer info?
Sure, I can get another view, it had a sticker with the manufacturer info, there you can see it a bit, but the sun and rain finished it.







You guys rock.
 
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