[R-390] Antenna wire
Transmaster
22hornet at gmail.com
Tue Nov 21 22:56:20 EST 2006
Well I once loaded up a ten mile long stretch of barbed wire fence.
It was amazing I was miles away from any power lines. I had a King
Kong signal despite the fact the top fence wire was about 4 feet off
of the ground.
Ken
On 11/21/06, Bernard nicholson <vk2abn at bigpond.net.au> wrote:
> I have found that the best WIRE for antennas is galvanised iron fencing wire ! People worry about resistance ect but when you have very little current flowing resistance isn't a problem , even when used as a transmit antenna the difference in radiation efficiency over copper is around 4% in Db terms this needs pretty good instrumentation to measure, When one looks at commercial antenna suppliers one finds that their range of wire antennas such as Broadband deltas and logperiodic arrays ect. come in three versions , HARD DRAWN COPPER , GALVANISED IRON AND STAINLESS STEEL, the last being for corrosive areas by the Sea , 8 gauge fencing wire is cheap and doesn't stretch , I have a 160 meter dipole at 90 ft between a couple of big trees its a 280Ft span and I have nearly half a ton of tension on it its been up there with no trouble since 1991 , I regularly hear and work the US from Australia on 160 using this antenna , On the subject if insulators They are sold here in Australia in Farm Produce stores for Electric fences both ceramic and High impact plastic ,they are very good and very cheap , The galvanised iron is a bit harder to solder to but with a hot 300Watt iron not too difficult , You need a nice big pair of Electricians pliers to handle it and you need to make sure you don't kink it , That's about it ,Not rocket science , Regards to all Bernie Nicholson Vk2abn
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