Thermal Drive Unit; Figure 3-9 Tdu Cable Selector - Motorola STARLINE SERIES Installation And Operation Manual

3-14 Amplifier Setup

Thermal Drive Unit

The TDU senses temperature and controls the Bode board. It is assumed that the cable is
subjected to the same or similar temperature; therefore, the TDU should not be used for
underground installations.
To set-up the TDU:
1
Place the jumper on the TDU (Figure 3-9) to the
specifies the amount of cable for which the TDU compensates at the highest frequency
preceding the MB*/* station. Low = 0 dB to 15 dB of cable, medium = 15 dB to 30 dB of
cable, and high = 30 dB or more of cable.
Figure 3-9
TDU cable selector
2
Position the drive control select jumper (Figure 2-15) temporarily in the
perform the complete procedure described in Manual Gain Control if not already completed.
3
Position the drive control select jumper to
4
Connect a signal-level meter to the
band-edge carrier.
5
Turn the thermal level potentiometer on the TDU fully clockwise and then reduce to obtain
the level obtained in Step 9 under Manual Gain Control.
MB*/* Installation and Operation Manual
,
LOW MEDIUM
Thermal
Medium level
Low High
.
DRIVE UNIT
test point and tune the meter to the high
FWD OUT
, or position. This setting
HIGH
position and
MAN