Antennas

Couple of months ago high wind gusts bent a support tube in my tower.
Well, yesterday was repair day. Here are some photos.

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Photo taken earlier showing a bent support tube.

 

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Winch in place, getting ready to lower.

 

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Antenna on its way down.

 

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Faulty support tube removed.

 

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Not straight.

 

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On its way up again.

 

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Done!

 

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improvements: Support tube is now made of steel, before it was of aluminum. Also, notice the second support bearing in the middle. Hopefully this improvements will make it hold.

Today I decided to try out the pa0rdt Mini Whip design.

I have only have tested it for å few hours, but so far I find it performing a lot better on the LF and MF spectrum compared to my other Active Antenna discussed I an earlier post on this site.

On shortwave up to 20m it seems to perform about the same BUT there is a very important difference between the two; pa0rdt design dos not overload when I simultaneously transmit on other bands. My other active antenna makes all kinds of crazy bi-products while transmitting.

I think I was a bit too hasty with my first report regarding the difference in performance of the two active antennas. Now, after a little more use I think they perform almost equally. The pa0rdt whip has a bit more gain but the SNR seems to be about the same.

 

pa0rdt Mini Whip Amplifier without whip

pa0rdt Mini Whip Amplifier without whip

 

17-02-2013 pa0rdt-Mini-Whip

pa0rdt Mini Whip Amplifier