Motorola BT100 User Manual

All amplifiers are factory-aligned for optimal station flatness, therefore, there is usually no need 
to adjust the BDR board. However, you can make minor adjustments, if necessary to achieve 

flatness across the passband. 

The BDR-1G board includes flatness controls and a fixed cable equalizer for 1003 MHz. This 

equalizer, plus the contribution of the hybrid gain stages, produces approximately 14 dB of tilt. 
Adjust the BDR-1G board to correct peak-to-valley response variations. Adjust or replace the 
equalizer if the response exhibits tilt. 
Figure 3-3 illustrates the location of the BDR-1G board and the high-end flatness adjustment 

capacitor: 

 

You can adjust the variable resistors and capacitors on the BDR-1G board to flatten the 

response across the passband. Use C1, C2, C3, C4, C6, C7, R2, R3, R4, R5, L4, L5, and L6 on the 

BDR-1G board (illustrated in Figure 3-4) to obtain a flat response.