Hi Stan .....
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4465Khz... you aren't with the Russian Navy are you ...?...lol
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Don10 cable is a bit unique for antennas- its for military field 'phones, No?
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But is very strong, and it can support quite a heavy load.
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I am curious why you are using this frequency for a range that is so short-- 30 miles?... 4.5 Mhz can be a very long range frequency; day time 2-300 miles can be expected... at night time- the other side of the world. But if the distance gets too short, like your 30 miles , and there are intervening hills etc., the signals can drop down to noise. With normal antennas, it is just too close for any atmospheric returns, and too far for groundwave (which is practically non-existent on 4.5Mhz anyway.)
To have a successful close-in radio circuit on that frequency you'll need an antenna that radiates its energy nearly vertically- so the angle at which it is refracted comes done close to your station -- think geometrically. They are call'd Near Vertical Incidence (NVI) antennas, and most aren't difficult to construct.... the big thing if they are horizontal is to not elevate the wire more than 10-15 feet above the ground. You can construct a dipole (about 102 feet long @ 4.5Mhz,) or use a random length of wire with a tuner.
NVI is a major issue for close range HF tactical ground communications, and its important in airborne HF use. I could tell you stories about inadvertently switching in a NVI used for aircraft and wondering why we weren't talking any distance anymore. They can be very close range'd
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I hope this helps- but ask more question if necessary.
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Lauri
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