Pre-Amplifier Gain Adjustment; Connections; Installation Example; Connection Of Twm Unit - Videotec TWM Manuel D'instructions

Where to operate : Jumper J2
Adjustments :
Adjust the output impedance: 90 Ohm (jumper J2 plugged) or 125 Ohm (jumper J2 removed) to the
value nearest to that of the cable used.
If, for example, a Cat. 5, 100 Ohm cable is used, plug in the J2 jumper (impedance 90 Ohm).

Pre-amplifier gain adjustment

If necessary, (for long distances or if the signal quality received ,after the adjustment, by the TWRR/TWRB is
unsatisfactory) set the pre-amplifier gain at +10 dB.
Where to operate : Jumper J1
Adjustments :
• Gain at 0 dB: remove J1 jumper
• Gain at +10 dB : plug in J1 jumper

Connections

Installation example

The camera video signal in TWM input is displayed on the monitor connected to TWRB/TWRR output; the video signal
is transmitted through a twisted pair cable:
TWM

Connection of TWM unit

Video input connection

Where to operate : BNC connector of TWM transmitter
Adjustments : connect TWM transmitter to the camera by the BNC connector

Twisted pair output connection

Where to operate : K1 terminal block of TWM transmitter, K3 terminal block of TWRB/TWRR receiver
Adjustments : connect the terminals with twisted pair cable, according to the following table
TWM transmitter : K1 terminal block
For connection use only unshielded twisted pair cable (see the paragraph "Type of cable" on the next page).

Power supply connection

Where to operate : K1 terminal block of TWM transmitter
Adjustments : connect the power supply to K1 terminal block
terminal A ------------- ----------- terminal A
terminal B ------------- ----------- terminal B
Pag. 5
MATERIAL USED
TWRB/TWRR
Video part:
•
1 monitor
•
1 telecamera
•
1 transmitter
•
1 receiver TWRB/TWRR
TWRB/TWRR receiver : K3 terminal block
TWM
TWM 2701