Plessey PRC 320/1 - Ground Wave Vertical; End-Fed Antenna

GROUND WAVE VERTICAL ANTENNAS (Fig.10)
2.12 For ground wave operation the RT320/1 uses
vertical antennas based on the 5.4m mast (see
рага.2.9 on page 25). In both the 5.5m and the 7.9m
antennas the down lead is connected to the RT320/1
antenna terminal, as shown, and the setting up
procedure is as shown in Fig.6. Both antennas can be
used throughout the frequency range of the equipment,
except within the dead spots shown hatched in the ATU
RANGE AND LOADING table. Іп these cases, an end-fed
antenna should be used, as described іп рага.2.17.
The antenna counterpoise must be used with these
antennas (see para.2.10).
SKY WAVE DIPOLE AND END-FED ANTENNAS (Fig.11,12,13
Pages 33,35,36)
2.13 For sky wave operation the RT320/1 can use
either a dipole on an end-fed antenna, both based on
the wire antenna. This comprises 47m of insulated
braid, marked at one metre intervals with one green
marker, at five metre intervals with two yellow
markers and аї ten metre intervals with three blue
markers; it is wound on a bobbin equipped with а
throwing cord.
2.14 Various dipole configurations, each using two
wire antennas, are possible. Іп each case the
direction of the antenna is not critical for
communication over distances up to 300km, but in
tropical areas the antenna should run М - S for the
lowest unwanted noise level. For distances greater
than 300km the antenna should be erected broadside on
to the direction of communication.
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