HFU HF Underground
Technical Topics => Equipment => Topic started by: Telegrapher on February 15, 2019, 1755 UTC
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Hi all,
I have a portable antenna (from military source) and I wonder what kind of antenna it is, and if possible some instructions as to how to mount / use it for SWL purposes.
See pictures for info.
https://imgur.com/a/LR3dK37
Kind regards,
Telegrapher.
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Do you have another photo? It just kind of looks like wires to my untrained eye. Is there any kind of components with it? What is the length etc?
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Hey,
I have added a few more with the antenna unplugged from my receiver.
Kind regards,
Telegrapher.
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Not able to see any photos yet.
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Three insulators are pictured, my guess is a delta loop configuration.
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Have you unraveled it to see how long it is?
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Yes. I only saw the first.
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Not yet, all I know is that it's long enough to grab on the other side of a 3 stories high building thrown over the roof top. To me it looks like it's designed to throw up in the field like in a evergreen for example to hide it. Since it's color is green and brownish. Easy to carry on-the-go and roll out for portable operations. I'll need a meter to measure the length of it, I don't have anything here at the moment to measure it's total length.. It's likely around 35 - 40ish as the house I threw it over was about 18 meters high. The unusual part to me is the 3 elements on the end of the antenna. I still don't know to this day how to mount them.. Upside or pointed down to the ground, or like the usual horizontal radials in most outdoor antenna systems I see around.. The longer I roll the wire, the better the signal. So it's not really acting like a AM antenna loop. It needs to be stretched out to be effective.
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I do not know from which radio station your antenna, but I have a similar one.
Antenna from the Russian military radio station R-105M (R-108M, R-109M). The length is 40 meters. From the technical description of radio stations:
• beam antenna directional length of 40 m, suspended at a height of 1 m above the ground, - to work at elevated distances and from shelters;
• an enhanced antenna consisting of a beam antenna 40 m long lifted from the radio station to a height of 5-6 m, with a gradually decreasing opposite end directed at the correspondent for working at increased distances and from shelters.
https://imgur.com/a/Mlm802k
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That describes exactly the design I have. Thanks for the clear images. It’s the same design as I have. The only thing is there’s no such plug on the end. Only a stripped wire is hooked up on the device like around a portable sw radios whip antenna. That’s what I mainly use it for. Outside DX purposes are nice with this antenna. Easy to carry and pull out. The description on the second image was all I needed to know. As I wasn’t able to find out how to put this thing in the right directions. Thanks for the information given. Highly appreciated :)
Happy SWLing. Kind regards,
Telegrapher