A neighbor had them stored in the back of his garage and was going to scrap them. Any idea what frequency these are for? They have F type connectors and are about 4' long.
What are these?
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I'm guessing (read: googled) they are 900 Mhz.
Can they be modified for U/VHF?
Can they be modified for U/VHF?
mmckenna
I ♥ Ø
F connectors are not often used in the 2 way radio industry. They are more common in cable TV or home tv/FM use.
Without having measurements of the driven element length, it would be hard to be sure, but I suspect those are UHF TV antennas. We had a few of those on top of one of the buildings at work for a master antenna system.
Without having measurements of the driven element length, it would be hard to be sure, but I suspect those are UHF TV antennas. We had a few of those on top of one of the buildings at work for a master antenna system.
prcguy
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They almost look like Cushcraft commercial Yagis cut for UHF. Are you sure they have F connectors and not type N? Otherwise it could be a single channel UHF TV antenna for a cable head end, etc.
mmckenna
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Modifying them for other frequencies would require changing the lengths of the elements as well as the spacing. In other words, a lot of work. If they are 900MHz, to put them on UHF or VHF you'd have to make the elements quite a bit longer and more spacing between them.
It shouldn't be that hard to approximate the frequency.. What is the length of the driven element? (The one with the connector and the black caps on the ends)..
As prcguy suggests.. They do have a resemblance to Cushcraft antennas..
As prcguy suggests.. They do have a resemblance to Cushcraft antennas..
700 MHz wisp antennas maybe. Looks similar to one on a friend's house out in the country.
iMONITOR
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Possibly used for point to point computer data wireless modems?
I did not see any identifying marks on them. When I get home I will measure the driven element. Thank you all for the ideas and your knowledge.
It looks like the mounting arrangement is set up for horizontal polarization, so TV sounds likely.
The shorter ones driven element is 9" and the longer 10.
mmckenna
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That would land around UHF TV channel 37 or so, give or take a few channels. A bit around 600MHz.
The F connector would support that
As stated, the horizontal polarization would suggest TV also.
Splendid! Thank you all. I'll hook them up on the roof and see what happens. Can't hurt to try.
Ubbe
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The antenna to the right looks as if it has a bolt that keeps the elements in place. Maybe the elements can be moved along the boom.
Use an online yagi calculator and adjust the space to fit a frequency you would like to receive. The lenght of the elements will probably not match the frequency but it is the space between elements that are the crucial mesurements in a yagi.
Yagi Uda Antenna (Rothammel)
/Ubbe
Use an online yagi calculator and adjust the space to fit a frequency you would like to receive. The lenght of the elements will probably not match the frequency but it is the space between elements that are the crucial mesurements in a yagi.
Yagi Uda Antenna (Rothammel)
/Ubbe
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