Go to the Butternut web site and download the instructions for the
"Counterpoise" which is the radial system for above ground installation. With
that system the base coil is not used and the length of 75 Ohm coax used is
much longer and should be coiled near the feed point, then connected to any
length 50 Ohm coax lead in. I had trouble with the counterpoise system and
finally wound up using several above ground random length (20 feet or longer)
sloping radials. Get the "Counterpoise" instructions off the web!
73
Highland Ham wrote:
A blind radio amateur living in my area got the above antenna installed
in his garden complete with an off the ground radial system.
I now try to set-up the system with an MJ 259B analyser ,but I am
getting nowhere ,because of the following :
There are 2 visual anomalies
1) The inductor between antenna and ground post e.g. across the
insulator (labelled 'Q' in the Pictorial ,page 14 of manual) is missing.
I know it is a coil of thick enameled wire with a diameter of approx 25
mm ( 1 inch ) but do not know its inductance .
So in order to make one myself I would appreciate receiving info re the
dimensions incl number of turns ,alternatively the required inductance.
2)The antenna kit is normally supplied with a specific length of 75 Ohms
coaxial cable directly connected across the inductor (see above)
This length of 75 ohms coax is part of the matching system and is to be
connected to any length of 50 Ohms coax running to the transceiver.
In the Pictorial ,page 14 of the manual ,this length of 75 Ohms coax is
identified by 'R'.
However the actual installation shows 1 length of RG-11 (75 Oms) coax
all the way to the transceiver.
My obvious question : What is the required length of 75 Ohms coax ?
TIA for any relevant info
Frank GM0CSZ /KN6WH
(supporting member Radio Invalid and Blind Club, RAIBC, based in the UK)
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