Technical Guide

24
DOWNLINK
UPLINK
Switch 1 Switch 2 Switch 3 Switch 4 Switch 5
1 dB 2 dB 4 dB 8 dB 16 dB
124816
12345
124816
12345
Additive combination effects:
• Switch 1 (1 dB) + Switch 2 (2 dB) = 3 dB attenuation
• Switch 1 (1 dB) + Switch 2 (2 dB) + Switch 3 (4 dB) = 7 dB attenuation
• Switch 1 (1 dB) + Switch 2 (2 dB) + Switch 3 (4 dB) + Switch 4 (8 dB) = 15 dB attenuation
• Switch 1 (1 dB) + Switch 2 (2 dB) + Switch 3 (4 dB) + Switch 4 (8 dB) + Switch 5 (16 dB) = 31 dB attenuation A
few practical attenuation examples:
Important Note: Turn ALL uplink attenuations dip switches to ON and adjust them back one step at a time until uplink
connectivity is made with the Emergency Radio Tower.
• Turning all switches OFF = 0 dB attenuation (booster is at full gain).
• Turning ON switch #1 in a bank = 1 dB attenuation (booster maximum gain is reduced by 1 dB).
• Turning ON switches #1, 3, and 5 in a bank = 1+4+16 dB attenuation = 21 dB attenuation. For example, in an 80 dB booster,
the selected channel is reduced to 59 dB (80 dB -21 dB).
• Turning ON all switches in a bank = 1+2+4+8+16 dB attenuation = 31 dB attenuation. For example, in an 80 dB booster, the
selected channel is reduced to 49 dB (80 dB-31 dB).
When the BDA is powered on, the green Power Light (3) should
illuminate.
• If any of the bands are oscillating, the corresponding band lights
(1 and/or 2) will flash red and that band will eventually shut
down if adjustments are not made.
Note: In general, the uplink and downlink DIP switches should be set
identically but this is not always the case.