On Mon, 02 Jan 2006 14:33:18 GMT, Dave Oldridge wrote:
Chris W wrote in news:IT3tf.45644$ih5.19066@dukeread11:

I want to put a short 2 meter yagi and a long 70cm yagi on the same
vertical mast. The 70cm will be a horizontally polarized, center
mounted 17' boom and the 2 meter will be a vertically polarized, end
mounted 6 foot boom. How far apart do they need to be? I will only be
transmitting with one at a time but one could be receiving and the other
transmitting, the 70cm will be for ATV receive only for now.

A good rule of thumb is to separate them by at least a half-wave at the
lowest frequency. In this case that means about a meter (39") apart.

Not when they are orthogonally polarized. They can be 0.000 wavelengths
apart. I.e., in the OP's case, the 2M elements can be _mounted_ on the
70cm's boom.

I have a 6-el, close-spaced 2m vertical mounted on the forward boom of
my CC A3S. (Not that I give a crap much about 2M vert. propagation...)

HNY es 73
Jonesy
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Marvin L Jones | jonz | W3DHJ | linux
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