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Author Topic: 2 m 440m (70cm) 1/4 wave antenna  (Read 796 times)
KG4RBS
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Posts: 8




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« on: November 23, 2017, 08:58:06 PM »

Has anyone used a 2m 1/4 wave antenna to transmit 440m (70cm). Would it be a 3/4 wave. ?
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WB6BYU
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Posts: 17279




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« Reply #1 on: November 23, 2017, 10:36:43 PM »

Yes and yes.

It works OK for local stuff, though there is more wasted high angle radiation that one might prefer.
But it is a quick way to get on 440 without adding another antenna.
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AC4RD
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Posts: 1465




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« Reply #2 on: November 24, 2017, 08:41:22 AM »

You can also find 1/4 wave dual 2m/440 antennas--I've bought several of them in 3/8x24 mount from Buxcomm for about $8 each.  Work great!
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K7KBN
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Posts: 3491




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« Reply #3 on: November 24, 2017, 09:43:00 AM »

Absolute simplest 2/70 antenna ingredients:

One SO-239 coax connector.
Five pieces solid copper rod, each about 20-1/2 inches long, with a snug fit to the connector center.

Put the connector in a soldering vise so the center connector is up.  Solder one rod, keeping it straight.
We'll call this rod the radiator.

Solder the other four rods to the skirt of the connector so you can bend them down.

When things cool down, connect coax to the SO-239.  Bend a very small loop in the tip of the radiator and hang it from a convenient support.  Tune it in the usual way.  Rods may be a bit too long.  Radials can stick straight out or angle downwards.  Trim for length AFTER adjusting angle.

I've used many of these.  Maybe ten minutes if you have all the material and a good soldering iron, plus another few minutes to cut to length and adjust.  Hit repeaters 35-45 miles away on both bands with a little Standard hand-held (two "AA" batteries).
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73
Pat K7KBN
CWO4 USNR Ret.
N1LO
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Posts: 1123


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« Reply #4 on: November 25, 2017, 07:02:02 AM »

They will accept power on uhf with reasonable power but will have a poor pattern and not reach very far. Good for doing cross band repeat though with uhf link near the antenna and the 2m going the further distance
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