Videotec TW Serie - Manual (Page 10)

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6.2.3 Receivers
+ + +
Fig. 05 TWRB2.
Fig. 06 TWRR2.
+ + +
Fig. 07 TWRB2A.
First adjust the GAIN trimmer to
achieve a 1 Vpp signal.
Then adjust the DIST trimmer (distance equalisation)
to reconstruct the video signal according to the
distance (check the signal using an oscilloscope).
If the signal is over-compensated try again by
turning OFF some dip switches on the transmitter;
if under-compensated try again by turning
ON some dip switches on the transmitter.
ON
1 2
A B
3
Fig. 03 TWM2.
ON
1 2
A B
3
Fig. 04 TWP.
6.2.1.1 Active transmitter setup
Set the dip switches to ON according to the
distance of the cable in order to achieve the best
video signal on the monitor, (bear in mind that
dip1 inserts the lowest equalisation and dip 3 the
greatest; it is also possible to set combinations
of the 3 dip switches). Then, after adjusting
the receiver, it may be necessary to change
slightly the settings made on the transmitter.
6.2.2 TWP passive transmitter setup
It is possible to attenuate the output video
signal (on the terminal for twisted cable) setting
the dip switches according the values on the
table. This function can be required in case
of short distances, with receiver input signal
levels too high and with risk of saturation.
DIP POSITION
Dip1 Dip2 Dip3 V terminal output
ON ON ON Vout (twisted)= V in (coax)
x 1.15
OFF ON ON Vout (twisted)= V in (coax) x
1.15 / 2
OFF OFF ON Vout (twisted)= V in (coax) x
1.15 / 3
OFF OFF OFF Vout (twisted)= V in (coax) x
1.15 / 4
Tab. 02 In case of using the TWP as passive receiver,
set all dip switches to “ON” position.