Motorola BT100 ユーザーズマニュアル

3 

Position the drive control select jumper to 

AUTO

. 

4 

Connect a signal-level meter to the 

FWD OUT

 test point and tune the meter to the high 

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. 

The ADU and QADU operate by using surface acoustic wave (SAW) filters to select a pilot 

frequency and then monitoring the amplitude of this frequency. Any change in signal level is fed 
back to the Bode equalizer. It is assumed that the encountered signal level changes are due to 

changes in cable attenuation and hybrid output associated with a change in temperature. The 

Bode equalizer then changes its insertion loss to maintain a constant output level. The ADU 
(illustrated in Figure 3-6) and QADU (Figure 3-7) maintain a more precise output level than 

using the TDU or leaving the BT100 in manual control. 

 

 

 

 

To set-up the ADU/QADU: 

1 

Position the drive control select jumper (Figure 2-13) temporarily to the 

MAN

 position and 

perform the complete procedure described in Manual Gain Control if not already completed.