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Author Topic: antenna separation  (Read 873 times)
K9GLN
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Posts: 1




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« on: November 03, 2001, 01:21:51 AM »

1)Is there a suggested or standard minimum distance above the top the tower for placing the yagi on the mast and (2) how close above a tribander can a 2 meter 44O yagi be installed on the same mast without creating problems.

I'd like to stack a 2/440 yagi above my A3 but I am unsure about the separation issue.
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WB2WIK
Member

Posts: 20611




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« Reply #1 on: November 05, 2001, 11:01:12 AM »

39" spacing from the 146/440 beam to the A3 beam is perfectly sufficient and in theory creates zero interactive coupling between the two, provided both are horizontally polarized.

In practice, I've found even closer spacings are acceptable.

However, if the 146/440 beam is vertically polarized, that's a totally different situation which requires special attention to the mounting and cable routing for the VHF/UHF antenna; also, spacing between the antennas will need to be increased, because the large diameter boom of the A3 will look like a huge untuned reflector beneath the vertical tips of the lower-facing elements of the VHF/UHF antenna, which will skew the radiation pattern from the VHF/UHF antenna upwards, which is undesirable.

73 de Steve WB2WIK/6
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