[NLRS] [BC'ers] My new foot print on 432 MHz

[David Palm]

Thanks Jerry, that's a fascinating analysis ("How Close Can They be
Stacked?")  I'm going to have to stack my antennas closer than I would
like, but your data suggests that I should not take too big a hit.

Looking into it a bit more confirms that what I have here is a K1FO
22-element yagi.  I knew that this antenna would be "sharp", but it never
occurred to me that one might get similar gain but with less critical
pointing by stacking.  I am curious to see how this goes when I get this
yagi on a rotor.  Maybe it'll turn out that I don't really like it either.

Question for you and the group.  I was thinking about putting this 432 MHz
antenna at the very top of the stack and using a section of either wood or
PVC on top, so that the antenna isn't looking through a metal mast.  Is
this a good idea?

Thanks and 73,

David  W9HQ


On Tue, Aug 11, 2015 at 10:28 AM, Dr. Gerald N. Johnson <geraldj at netins.net>
wrote:

> I put up a K1FO 22 element 432 yagi in time for the UHF contest. It works
> when you get it ON the station. The 3 dB beamwidth is about 23 degrees,
> hardly more than the notches of the brake on a HAM-M style rotor. Aiming it
> is super critical because its refined to have a very clean pattern. Moving
> it less than 10 degrees moved N4PZ from asking "who is that?" to having a
> QSO. For the narrow beamwidth I don't like it. I plan to build and stack 3
> 9 element K1FO when I get a tower up. The gain will be similar, but the
> beamwidth much wider in azimuth. I wrote about that combination in my
> article about close stacking:
> http://www.geraldj.networkiowa.com/papers/CSVHF2011/HowClose.pdf
>
> 73, Jerry, K0CQ
>
>