Motorola BT100 ユーザーズマニュアル

3-10 

ƒ 

Low = channel 2 (55.25 MHz) or channel 3 (61.25 MHz) 

ƒ 

If the tilt is less than required, install a higher value input equalizer 

ƒ 

If the tilt is greater than required, install a lower value input equalizer 

ƒ 

If the high value equalizer provides too much tilt and the low value equalizer provides 

too little tilt, use the lower value equalizer. Under-equalization is preferred to 
over-equalization. 

 

If you set up the BT100 using an SCS-*, you must increase or decrease the JXP input pad by 
the amount of change you made in the SCS-* value. Therefore, to maintain a proper gain 

level, it is necessary to adjust the input pad value as follows: 

ƒ 

For each increase in SCS-* value, decrease the input pad by 1 dB.  

ƒ 

For each decrease in SCS-* value, increase the input pad by 1 dB. 

ƒ 

If you replace an SFE with an SCS-*, reduce the value of the input pad by the value of 

the SCS-*. 

9 

Measure the output level at the highest frequency. 
It should be within 1 dB of the system design level. If it is not, you must adjust the midstage 

pad (JXP) and/or the output pads (JXP OUT, JXP 1, JXP 3, JXP 4) accordingly. Refer to 
Section 6, “Operating Tips,” for midstage/output padding information and recommendations. 

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 3-5) to the 

LOW

, 

MEDIUM

, or 

HIGH

 position to specify 

the amount of cable for which the TDU compensates at the highest frequency preceding the 

BT100 station.  

 

Low = 0 dB to 15 dB of cable, medium = 15 dB to 37 dB of cable, and high = 38 dB or more of 

cable. 

 

2 

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

MAN

 position and 

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