LGMT434 Masthead Repeater Installation Handbook
Page 5.
Antenna connection.
Connect the 1/4 wave antenna onto the BNC socket by first removing the cable gland
from the enclosure. Now attach the antenna on to the BNC socket and then pass the
antenna through the cable gland. Screw the gland into the enclosure and tighten with a
21mm AF spanner. Finally tighten the cable gland around the antenna.
For even better results, use an external antenna (AE434). Follow the same procedure
but instead pass the coaxial cable through the cable gland and crimp on the 50 ohm BNC
plug supplied with the AE434.
Connecting to the alarm system.
Masthead LGMT434
Connect a CAT5 twisted pair cable to the four terminals as shown in Fig 2.
The four terminals are:
0 volts. 12 volts for the 12 volt supply and A&B for the DATA.
Run this cable down to the relay unit (LGRU64) or compatible DVR.
(Maximum length 50 metres)
LGRU64 Relay unit. Terminate the CAT5 cable at the terminals on the rear of the relay
unit in the same way that they are connected in the masthead. 0 volts & 12 volts for the
supply. RX&TX for the DATA. (See LGRU64 operating and installation instructions).
Connecting to a compatible DVR or alarm
system.
A conversion kit is available for is available to
make this job easier and comprises of a power
supply, junction box and appropriate serial lead.
(See individual products operating and
Installation Instructions)
CA T 5 cable
from m asthead
9 pin serial
plug to D VR
12 volt 300m a
power adaptor
Fig 3.
