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BRUEL & KJAER 2305 - Page 90

BRUEL & KJAER 2305
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Directional Characteristics
of
Antennae.
By
combining
the
B & K Level
Recorder
and
Turntable
with
a
suitable
signal
generator
and
a field
strength
meter,
directional
characteristics
of
VHF
and
UHF
antennae
ca
n be
automatically
re
c
ord
ed.
In
Fig.
6.27 is
shown
a
measur-
ing
set-up
used
when
measuring
the
directional
characteristics
of
a six-
element
Vagi
antenna.
The
antenna
was
horizontally
polarized,
designed
for
210 MHz (Mc/s)
and
had
an
output
impedance
of
70 Q .
To
rear connection
pins 3
+ 4 (4 earthed)
f6f8H"
Fig.
6.27. Set-up
lor
recording directional characteristics
01
VHF
antennae.
Fig.
6.28. Directional characteristic
01
a six-element Yagi
antenna
.
89

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