Skanti TRP 9250, Техническое руководство, Страница: 89 / 289

Transceiver Unit-to-Antenna Tuning Unit connection
The units are interconnected by an RG-213/U coaxial cable and a 4 x 0.5 mm2 screened multiwire
cable with a maximum length of 100 metres. The coaxial cable is terminated in a UHF-connector
(PL 259 type) at the Transceiver Unit and connected to the socket marked "TX/RX".
The multiwire cable is connected to the terminal strip marked ATU on the connection board.
At the Antenna Tuning Unit both cables are connected to terminal strips. Remember to fit the rubber
gasket on the cables before connecting.
’ATU’
TU
TS
no. ATU
TS
no.
Designation Description
1 1 +24V +24V supply voltage to ATU
2 2 TX/RX, PROTEC TX/RX signalling from TU and protection
signalling from ATU
3 3 -TU-ATU DATA Bi-directional serial data communication,
0/24V
4 4 GND System GND
NOTE:
TRP 9250 may be operated without the ATU 9250. Just connect the 50 ohms antenna system to
the coaxial socket marked "TX/RX" at the Transceiver Unit .
Important:
In installations with long earth straps to the Antenna Tuning Unit, high RF voltages may be present
on the ATU ground terminal. To avoid this voltage being coupled to the Transceiver Unit the coaxial
cable must be run from the Transceiver Unit to the point where the copper strap from the Antenna
Tuning Unit is connected to earth. From this point the coaxial cable must follow the copper strap to
the Antenna Tuning Unit. The coaxial cable should be placed upon the centre of the copper strap
to ensure good coupling. The part of the cable-run between earth and the Transceiver Unit must
not be run in parallel with the earth strap within a distance of at least 1 metre.
fig.20 fig.21
fig.22 fig.23
fig.19
Use a second wrench for backstop
when fastening the Antenna Horn nut
INSTALLATION INTERCONNECTION OF UNITS
3-18 TRP 9250 TECHNICAL MANUAL