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Commercial Radio Antennas - Please keep discussion related to professional, commercially used antennas and antenna systems for the two-way radio industry. Topics for the use of these antennas on amateur bands are accepted here.

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Old 05-19-2017, 1:12 PM
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Default 360 to 380 Mhz commercial antenna?

A buddy of mine does radio installations and he also decommissions old sites. I was at his place of business the other day and he was showing me his pile of scrap aluminum behind the shop. There was a 7 element Sinclair UHF Yagi in the pile. I showed some interest so he said, "just take it". He's had it so long, he couldn't remember where he got it. (I was hoping to use it on the 440 MHZ ham band).

I swept it when I got home and discovered it was resonant around 365 Mhz.. I took physical measurements with a tape measure and consulted the Sinclair catalog. It turns out that it's this antenna: Sinclair Technologies Online Product Catalog - SY307-SF7SNM(ABK)

Who uses 360 to 380 Mhz?? I checked the Canadian TAFL and couldn't find anything. Google searching shows that the band is for land and mobile services. I don't have any gear that will scan there, so I've never listened to see what was there.
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Old 05-19-2017, 2:41 PM
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Likely Military, of which you will not find much, if anything in TAFL for them

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Old 05-21-2017, 12:23 AM
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From what I heard from a local ham who purchased a CCR mobile that had this frequency area in the radio [350-390], he was concerned as it is used by the US Navy for satellite communications.
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Old 05-21-2017, 8:21 AM
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Ok.. I guess it is military.. This guy's business isn't limited to land mobile.. He has done work for the military and the aviation industry as well. It's a shame the antenna won't work on 440. It's a rugged little thing.
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Old 05-21-2017, 8:22 AM
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You may be able to cut it down to work in the ham band.

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Old 05-21-2017, 7:44 PM
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I was thinking that because it was at a lower frequency, I might be able to cut it shorter and get it to work on 70cm.

But, I was just talking to the fellow today. He figures he got it from a naval base. He's going to look through his huge pile of 'scrap' Sinclair Yagis and corner reflectors and see if he can find one closer to the 440 band.
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Old 05-21-2017, 9:34 PM
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The antenna could be modified (actually mostly rebuilt) to work in the 440 band.

It would involve shorting the elements and changing the spacing (to help maintain the gain and pattern) of the elements on the boom.

It might not be too difficult to use what you have and make it match existing plans from the internet. You could use one of the one line calculators for the dimensions or crunch the numbers yourself.
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Old 06-03-2017, 10:51 AM
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Default Antenna

Quote:
Originally Posted by jwt873 View Post
A buddy of mine does radio installations and he also decommissions old sites. I was at his place of business the other day and he was showing me his pile of scrap aluminum behind the shop. There was a 7 element Sinclair UHF Yagi in the pile. I showed some interest so he said, "just take it". He's had it so long, he couldn't remember where he got it. (I was hoping to use it on the 440 MHZ ham band).

I swept it when I got home and discovered it was resonant around 365 Mhz.. I took physical measurements with a tape measure and consulted the Sinclair catalog. It turns out that it's this antenna: Sinclair Technologies Online Product Catalog - SY307-SF7SNM(ABK)

Who uses 360 to 380 Mhz?? I checked the Canadian TAFL and couldn't find anything. Google searching shows that the band is for land and mobile services. I don't have any gear that will scan there, so I've never listened to see what was there.
225-400mhz is the Military version of 108-136 Air band. More than likely used for a base or hanger. This also is AM, not FM. Some good listening....fighters, in air refueling, etc.
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