[VHFcontesting] 2m yagi on 432

Tom Carney tomc7 at earthlink.net
Wed Apr 12 17:30:21 EDT 2006


jcplatt1 at mmm.com wrote:
> As Tree has pointed out, a 432 yagi is 3/2 wavelengths on 144 and it may
> show a decent SWR.   The pattern will be anything but decent and will most
> likely have a null straight ahead.     The antenna may have some gain, most
> likely 45 degrees off of "straight ahead".   Then again, it may have its
> best gain off the back.    Interestingly, if you sweep each side of each of
> the 2m elements forward 30 degrees ala a TV antenna, the 432 pattern cleans
> up pretty well and it has gain ..... not as good as a monoband 432 yagi,
> but pretty good, and the gain that is lost on 2m is very small.     Its
> possible to have a small portable/rover 2m & 432 yagi using this principle,
> .... at least playing around with EZNEC says so.    Anyone try this ?
> 
> 73, Jon
> W0ZQ
> 

Thanks for the rover ant suggestion.  I may give it a try.

As for John's 10 el 2M ant, I've used one on 432.  As you say the max 
gain is at 45 deg off of center.  I did some testing with a local and he 
reported it 2M ant was about an S unit and a half down from my 8el 432 
Quagi.  Over a longer path (100+ miles) the quagi was definitely better 
but not 1.5 S units.

73,  Tom K6EU



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