[MLB-WIRELESS] Hills Reflector focal point

[Horace Pinker]

Hi Tim I am assuming youre after the actual focal point not the point where 
the dipole is located yeah? Unfortunatly i can only provide you with a 
general estimate of where the dipole location is which is at 14cm from the 
dish now in the past  with the coniffer dish i have found that the truefocal 
point can be found by attaching a couple of strings  above and bellow the 
dipole (center of the dish) and passing them through the centre of a washer, 
then you need to pull the strings through the washer, while keeping the 
washer at the center of the dish. when the string intersects the outer edges 
of the dipole you have found the focal length of the dish (its at the spot 
where the washer is) This is all going from meory tho so might not be a 100% 
accurate
Anyway I have done tihis with a 15 dbm antenna and the focal length is  18cm 
from the backing plate, which happens to be very close to the outer limits 
of the plastic casing and the internal reflector?

>From: Tim Hogard <thogard at knotty.abnormal.com>
>To: melbwireless at wireless.org.au
>Subject: [MLB-WIRELESS] Hills Reflector focal point
>Date: Sun, 6 Mar 2005 02:51:56 +0000 (GMT)
>
>
>Does anyone have any info on where the focal point is on
>the 15db and 19 db hills reflectors or know an easy way
>to find it?
>
>-tim
>http://web.abnormal.com
>
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