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Maury Markowitz
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 Posted: Tue Oct 09, 2018 2:18 pm Post subject: T-shaped dipoles |
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I'm looking over an article about the British Army's first production radars, the GL Mk. I and Mk. II. The later used an antenna consisting of several dipoles arranged along a linear beam.
Each dipole consists of two parts (duh) but the oddity is that they are bent into an L shape, although unlike the letter the longer part is horizontal. They are rotated such that the two verticals are beside each other, making a sort of short-but-wide T shape.
Does anyone know why this particular arrangement may have been used? The total length appears to be less than 1/2 a wave, which is also curious. |
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admin
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| Posted: Tue Oct 09, 2018 6:11 pm Post subject: |
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| Can you upload a picture? |
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Maury Markowitz
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| Posted: Tue Oct 09, 2018 7:15 pm Post subject: |
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| admin wrote: | | Can you upload a picture? |
I have yet to find one where the elements are really visible. The best image I have so far is here:
https://upload.wikimedia.org/wikipedia/commons/9/97/GL_Mk._II_radar_transmitter.jpg
The image says it is the transmitter, but it is the receiver.The elements are arranged down the middle of the horizontal beam, but they are basically invisible. At the top of the beam, you can see a series of four pairs of rods pointing forward, they held the vertical part of the dipoles.
There's a *drawing* on page 39 of this book:
https://www.amazon.com/Army-Radar-Story-Development-Employment/dp/1908336846
I see now that my original description was wrong, the horizontal part was below the vertical, so it really was like an L and a backward L placed side-by-side. However, the upper example, used for measuring altitude, was inverted compared to those below. Perhaps that is a clue to the arrangement?
The cover of this book is the associated transmitter shack, which used conventional dipoles. |
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admin
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| Posted: Wed Oct 10, 2018 5:44 pm Post subject: |
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| I still can't tell what exactly I'm looking at |
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