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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 05-04-2018, 1:29 PM
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Red face So what do you use a Log Periodic Antenna for?

Back story-I found a company that was liquidating a whole bunch of inventory and happened to pick up some of these antennas new and unopened in a box. Can anyone tell me what specific application an antenna like this would be used for?

Kathrein Scala Division CL7-300 225-400 MHz band. Item Height 28 inches, and Item Length 62.1 inches.

Here's a link to the product. It looks like it's discontinued.

https://www.kathreinusa.com/wp-conte...09/CL7-300.pdf

Any guidance would be appreciated!

Thanks
Jason
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Old 05-04-2018, 1:50 PM
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225-400 MHz is a federal government band for various services. Aircraft, point to point links, trunking systems, satcom, etc.
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Old 05-04-2018, 1:54 PM
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UHF MilAir / WiMAX UHF, directional
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Old 05-04-2018, 1:56 PM
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So this is not a civilian use antenna. Hmmmm. Anyone need a military band antenna :-) :-) :-)
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Old 05-04-2018, 2:00 PM
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Note also that Log Periodic antennas are directional (not as directional as a Yagi, though, but much wider bandwidth). Good for pointing at a target transmitter site for weaker-signal reception within the spec'd band.
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Old 05-04-2018, 2:05 PM
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Log periodic antennas are wideband directional antennas. This particular one is designed for the UHF military aircraft band, as well as some goverment land mobile systems in the 380-400 MHz range.
You can either put it on a rotator, or you can mount it fixed in one specific direction.

John
Peoria, AZ
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Old 05-04-2018, 2:16 PM
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Originally Posted by UltimateAtrophy View Post
Back story-I found a company that was liquidating a whole bunch of inventory and happened to pick up some of these antennas new and unopened in a box.

Kathrein Scala Division CL7-300

Thanks
Jason
Jason, how many do you have, and are you interested in selling any, and if so how much?
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Old 05-04-2018, 2:38 PM
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These antennas would certainly be for a US Govt user. I would also be interested in buying one.


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Jason, how many do you have, and are you interested in selling any, and if so how much?
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Old 05-04-2018, 2:39 PM
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Quote:
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Jason, how many do you have, and are you interested in selling any, and if so how much?
Add me to the interested list. Please PM price if you're looking to sell any.
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Old 05-04-2018, 4:37 PM
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Just a reminder...

We do not allow the buying and selling in the forums. Please handle this in the Classifieds section or private messages.
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Old 05-04-2018, 4:41 PM
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I am intrigued in them, too.

The log periodic antennas I have used the most covered 2 to 30 MHz, at a military comms site. They were a little bigger than the ones you have.

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Old 05-04-2018, 4:47 PM
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Just a reminder...

We do not allow the buying and selling in the forums. Please handle this in the Classifieds section or private messages.
My apologizes to everyone.
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Old 05-04-2018, 5:18 PM
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Quote:
Originally Posted by UltimateAtrophy View Post
So this is not a civilian use antenna. Hmmmm. Anyone need a military band antenna :-) :-) :-)
A civilian can most certainly use it to listen in on that band. Obviously, you could not transmit, however.

Depending on the SWR, it might be useable in the 222-225 MHz Ham band. In which case, if you're licensed, you could transmit with it.

John
Peoria, AZ
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Old 05-06-2018, 4:40 PM
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Log Periodic antennas are wideband & directional, and typically have the performance of a 4 element yagi, but with greater front-to-back ratio. They excel at transmitter combining because of the wide bandwidth, and the power rating is only limited by the feedline and connector. That antenna will easily operate 10 to 15% above and below the frequency specification, so it is a great 216-225 antenna also. That Kathrein brand is a SCALA original design. Very high quality product.

These work well for ribbon systems, along a railroad, river, highway, with two mounted 180 degrees from each other. They would be fed with two feedlines connected to a hybrid coupler. That would provide two additional ports for two duplexed radios, talking both directions without combiner losses.

The only other broadband yagis are made by Sirio WY400-3N as a UHF 400-470 MHz Base Station 3 Element Yagi. The driven element is a very large diameter, as compared to the remaining elements. The power rating is limited to 150 watts. They make wideband VHF yagis and a wideband ground plane with a big radiating element.
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Old 05-11-2018, 4:37 PM
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Quote:
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Just a reminder...

We do not allow the buying and selling in the forums. Please handle this in the Classifieds section or private messages.
alright boys now lets just form an orderly and civilized line and mosey our way over to the.....ME! ME FIRST!!! DIBS!

I suspect there wont be buying and selling but more likely an auction.


of course i will be using mine for a fancy tie rack

Last edited by spacellamaman; 05-11-2018 at 4:42 PM.. Reason: real purpose/similar to a treadmill
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Old 05-11-2018, 4:52 PM
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Oh yea? I have a pair of dual polarity versions with 3dB Hybrid Couplers for circular polarity. They can be used as a dual horizontal or vertical or right or left hand circular. I can dry all my socks and still have a dozen elements left over for a bird perch or whatever.


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of course i will be using mine for a fancy tie rack
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Old 05-11-2018, 5:30 PM
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Oh yea? I have a pair of dual polarity versions with 3dB Hybrid Couplers for circular polarity. They can be used as a dual horizontal or vertical or right or left hand circular. I can dry all my socks and still have a dozen elements left over for a bird perch or whatever.
i always knew those dual polarity versions with 3dB Hybrid Couplers just HAD to be good for something.

everything i think to type next i keep having to erase cause i suspect a moderator will object.....

but either way its nice to see the birds have a friend, though i have to wonder if you have enough socks... or too many... it appears its google'n time
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Old 05-11-2018, 6:52 PM
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I know the FCC field offices usually have one or 2 on the roof; maybe for checking out complaints before they go out mobile and really check out complaints.
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Old 05-15-2018, 7:59 PM
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Quote:
Originally Posted by UltimateAtrophy View Post
So this is not a civilian use antenna. Hmmmm. Anyone need a military band antenna :-) :-) :-)
Jason,

If you do put this up for sale, can you put the link to it in this thread for everyone who is interested?
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Old 05-15-2018, 8:24 PM
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I think I have one of those in the garage.

Is this possibly the same thing?


Last edited by mancow; 05-15-2018 at 9:59 PM..
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