Antenna Identification

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VK3YMML
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Posts: 20
Joined: Sat Mar 14, 2015 11:02 am

Antenna Identification

Post by VK3YMML » Sun Dec 03, 2017 8:13 am

Hi all

I recently inherited some radio equipment including a large array of antennas, some are whip, also now have a 5/6 element beam antenna for an amateur radio (radio not included)

Is there a way based on the length of the antenna I can find out what freq it would cover. One has been labeled 27mhz, however, the others have no identifying marks

Thanks in advance
VK3YMML

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VK3RX
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Posts: 89
Joined: Fri Oct 27, 2017 7:18 pm
Location: Woodend, Victoria

Re: Antenna Identification

Post by VK3RX » Sun Dec 03, 2017 12:58 pm

Some pix might assist.

Helically wound types with heatshrink covering can be a bit difficult to identify, but someone may recognise a model. They can be for anywhere over the HF range, and typically the longer ones for lower frequencies, shorter ones for higher e.g. 5 feet or less usually for 27/28MHz.

Other than recognising a model, the only sure way to determine the frequency would be to connect an antenna to a mount (e.g. on a vehicle) or ground plane and use an antenna analyser.

For stainless steel whips, with no base loading coil try this:

http://www.qsl.net/kd4sai/antencal.html

Example: for 146MHz in the 2 Metre amateur band, the length of a quarter wave whip is 19"

If a whip has a base loading coil, again an antenna analyser would be the only sure way to find out the frequency range.

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