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Author Topic: Yagi vs Log Periodic  (Read 2273 times)
KG4WXP
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Posts: 165




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« on: July 19, 2009, 01:15:47 PM »

Which one is better for dx 6m and 2m operation?

This will be on top of a roughly 50 ft tower.
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WB2WIK
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Posts: 20574




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« Reply #1 on: July 19, 2009, 06:14:38 PM »

Usually, a Yagi.  Most gain per boom length of any design.  After 70 years, nobody's really come up with anything better.

The advantage of an LPDA is bandwidth, not gain.

WB2WIK/6
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WX7G
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Posts: 5977




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« Reply #2 on: July 22, 2009, 05:10:26 AM »

A Log Periodic (LP) has three or four active elements at any one frequency. So, it will perform like a three element Yagi-Uda.
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K7LA
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Posts: 61


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« Reply #3 on: August 06, 2009, 07:24:21 PM »

A single band yagi will outperform a LPDA by usually 3 db because there is no compromises for bandwidth.

Stack a pair of yagis and it's no contest.  On 2 meters a phased four-bay array will blast a signal.

Best of luck on your station.
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KM3F
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Posts: 501




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« Reply #4 on: August 06, 2009, 10:57:33 PM »

The LP by it's name is a 'wide band' config and it's only claim to fame.
Where your looking for max performance 'within' a band, the Yagi is the preferred type.
On 6 and 2m, the antennas are not that large.
Space them about 8' apart and there will be no interaction.
Look at the 2m yagi with 10 to 12 elments on a 20' boom and a 5el 6m wide spaced on a 20' boom and you will have a reasonable system for both bands.
Not the most gain you can get but a good start to see what results you might get.
On the LP type, they have a lot of elements, a more complicated feed system and the wide band width is waisted on frequencies you will never use at the expense of loss of gain in the bands you want to use it in, otherwise the design has it's uses for other reasons..
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