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Author Topic: Stacking a Log-Periodic and Mono-bander?  (Read 891 times)
VE7DQ
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Posts: 176




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« on: October 12, 2012, 03:54:20 PM »

I have procured a KLM 10-30-7LP Log-periodic antenna from the estate of a distant relative.  My primary HF interest, however, is 20 Meters; I'd like to have better than L-P performance on that band, and can construct a 204BA or 205BA out of various parts I have laying around.  Can I stack the two on the same tower 6 to 10 feet apart with separate feedlines and expect minimal interaction and/or degradation?  What, if any, interaction would there be?  Is there a better alternative, without breaking the bank?

TIA and 73
Tom
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W8JI
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« Reply #1 on: October 12, 2012, 03:57:45 PM »

10 feet is far too close for a log that covers 20 meters and a 20 meter Yagi.

You need to at least have 20 feet or more.

If the log and Yagi didn't overlap the same band or close to the same band, you would probably be OK. 
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WX7G
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« Reply #2 on: October 12, 2012, 07:44:39 PM »

I'm thinking it might work if the elements are oriented 90 degree apart. This is a job for a NEC model.
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VE7DQ
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« Reply #3 on: October 14, 2012, 09:16:24 PM »

Thanks for your input. 

'7G, you're not the first person to suggest 90 degree orientation, but I must consider that option carefully, as there will be a bunch of aluminum up there if it doesn't work.

'JI, that kind of separation just isn't possible with my present tower configuration.

I'm frustrated, but will deal with it.

73
Tom
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