Skanti TRP 9250 S, Техническое руководство

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ANTENNAS
The standard equipment is used with common transmitting and receiving antenna. The antenna
should be erected in the open, away from conducting object such as derricks etc. which may cause
reduction of the radiated power. Insulators should be of the best type having low leakage even when
wet. Stays, wires, steel masts etc. should be either effectively earthed or insulated. The antenna
should also be kept as far away as possible from electrical equipment in order to minimize noise.
Electrical installation such as cable braiding (screens) and instruments in the vicinity of the antenna
should be earthed effectively, and the instruments in question should be fitted with
noise-interference suppression devices, effective in the range 0.1 MHz to 30 MHz to avoid
malfunction of these instruments. The Antenna Tuning Unit will tune on any frequency in the range
1.6 to 30 MHz to wire and/or whip antennas of 7 to 18 metres total length. If possible long antenna
should be installed to avoid reduction of the radiated power in the lower frequency bands. Short
antennas of 7 metres length should therefore only be installed where it is impossible to install a
longer and more efficient antenna.
The antenna is terminated at the insulator at the top of
the Antenna Tuning Unit. The insulator must be relieved
from mechanical stress by using max. 1 metre flexible
wire between the insulator and a support (fig.15).
To maximize the radiated power and avoid flash over
keep distance to metal parts as long as possible. All wire
junctions in the antenna system must be made with
cable lugs of correct size according to the wire gauge.
This will prevent bad connections due to corrosion. For
further corrosion proofing silicone grease may be
applied to the cable joints.
Cable strain relief
Copper strap
fig.13
Mount the ATU on a custom-built bracket
made from iron angle bars
fig.12
ANTENNAS INSTALLATION
TRP 9250 TECHNICAL MANUAL 3-15