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6:1 balun

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July 25th 16, 07:45 PM posted to rec.radio.amateur.antenna

Ralph Mowery Ralph Mowery is offline

Ralph Mowery is offline

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First recorded activity by RadioBanter: Jul 2006

Posts: 702

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6:1 balun

In article , says...

I don't understand. The antenna is 300 ohms from 80 to 10 meters? This
boggles the mind.

No, the antenna is not 300 ohms from 80 to 10 meters, but it is
somewhere around that for most of the ham bands from 80 to 10 meters.

The main thing for me is to get it below a SWR of 3:1 or so over the ham
bands. Many of the OCF antennas will not do 5 MHz, 10 MHz, or 21 MHz
with a low swr. That is ok with me as I don't work 10 and have a
triband beam that covers 21 MHz. If I really want to work the few
frequencies at 5 MHz I can always use my manual tuner and just take a
hit on the losses which probably are not too much at that frequency and
feeding the antenna with 100 feet of some rg 8 type coax.

The antenna I put together for field had a very low swr (below 2:1) on
most bands but 15 meters where it was about 5:1. That was at 25 or so
feet. The same length antenna at 50 to 60 feet at my house and the swr
is much higher. That is the reason to go from a 4:1 to a 6:1.

When it cools off some I will put the now completed balun on the antenna
and see what it does.

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