Mobile Communications Inc. BRB8191 ユーザーズマニュアル
Gain Level: Understanding the Control Panel and LED lights
Manual Gain Control
General: Four green LED lights for each frequency band will indicate the the level of amplifi-
cation that is being applied by the Booster to the receive (RX) signal and transmit (TX) signal.
Gain is applied to both RX and TX signals. Normally all four green LED will be solid on. If any
green LED lights are flashing or off, it is an indication that gain has been reduced. There are
four events that will cause the green LED lights to turn off or flash.
1) Shutdown:
a) Automatic shutdown will occur in one band or both bands if antennas are placed too close
to each other and the ‘Automatic Oscillation (feedback) Suppression’ function cannot eliminate
the oscillation. TX and RX gain will be turned off completely in the frequency band where oscil-
lation cannot be suppressed.
b) Manual shutdown can also be achieved in one or both frequency bands by the user.
2) Oscillation (feedback) Suppression:
The booster will automatically apply attenuation (reduce gain) to suppress oscillation (feed-
back). This function is automatic and cannot be manually overridden.
3) High Power Control:
The booster will automatically apply attenuation (reduce gain) if RX or TX power is too high.
This function is automatic and cannot be manually overridden.
4) Manual Attenuation:
Gain can be increased or decreased manually by the user in 2dB steps over a range of 30 dB
for each frequency band, however, the user will not be able to reduce attenuation that has
been applied by the automatic oscillation suppression function or by the automatic high power
control function in order to protect both, the cellular tower and the booster.
cation that is being applied by the Booster to the receive (RX) signal and transmit (TX) signal.
Gain is applied to both RX and TX signals. Normally all four green LED will be solid on. If any
green LED lights are flashing or off, it is an indication that gain has been reduced. There are
four events that will cause the green LED lights to turn off or flash.
1) Shutdown:
a) Automatic shutdown will occur in one band or both bands if antennas are placed too close
to each other and the ‘Automatic Oscillation (feedback) Suppression’ function cannot eliminate
the oscillation. TX and RX gain will be turned off completely in the frequency band where oscil-
lation cannot be suppressed.
b) Manual shutdown can also be achieved in one or both frequency bands by the user.
2) Oscillation (feedback) Suppression:
The booster will automatically apply attenuation (reduce gain) to suppress oscillation (feed-
back). This function is automatic and cannot be manually overridden.
3) High Power Control:
The booster will automatically apply attenuation (reduce gain) if RX or TX power is too high.
This function is automatic and cannot be manually overridden.
4) Manual Attenuation:
Gain can be increased or decreased manually by the user in 2dB steps over a range of 30 dB
for each frequency band, however, the user will not be able to reduce attenuation that has
been applied by the automatic oscillation suppression function or by the automatic high power
control function in order to protect both, the cellular tower and the booster.
The master control button has 3 functions which cycle every 3 times pressed as follows:
1) 800mhz manual gain control Press once. The 3 orange LED lights for the 800 mhz band
will flash together. Use up or down arrows to adjust gain in this frequency band as desired.
Each push of the up or down button will adjust 2 dB of gain. Total manual adjustment range
is 30 dB. Adding more than 30 dB of attenuation will shut down the frequency band. Quick
shutdown of the frequency band can also be achieved by holding the down arrow. When the
frequency band shuts off all of the orange and green LED lights for that frequency band will
flash every 2 seconds.
2) 1900mhz manual gain control Press again. The 3 orange LED lights for the 1900 mhz band
will flash together. Use up or down arrows to adjust gain in this frequency band if desired.
Each push of the up pr down button will adjust 2 dB of gain. Total manual adjustment range
is 30 dB. Adding more than 30 dB of attenuation will shut down the frequency band. Quick
shutdown of the frequency band can also be achieved by holding the down arrow. When the
frequency band shuts off all of the orange and green LED lights for that frequency band will
flash every 2 seconds.
3) Manual gain LED display Press again to display the LED status of your inputed manual gain
settings then power the booster OFF/ON for manual settings to take effect. Each time you
cycle to this 3rd setting you will see your inputed manual gain settings displayed on the LEDs.
Note: the booster will remember manual settings through power on and off conditions. If you
want to return the booster to ‘Fully Automatic Mode’ you must go through step 1 and set the
800 MHz gain control to full gain (four green LED lights solid ON), then go through step 2 and
set the 1900 MHz gain control to full gain (four green LED lights solid ON). Power the booster
OFF and then ON for ‘fully automatic mode’ to take effect.
Important:
a) for manual settings to take effect, the booster must be powered OFF and then ON.
b) manual settings cannot override the automatic functions of oscillation and high power
controls. This means that if you are trying to set a gain level higher than the automatic control
functions allow, the manual gain settings will be limited by the automatic control functions.
1) 800mhz manual gain control Press once. The 3 orange LED lights for the 800 mhz band
will flash together. Use up or down arrows to adjust gain in this frequency band as desired.
Each push of the up or down button will adjust 2 dB of gain. Total manual adjustment range
is 30 dB. Adding more than 30 dB of attenuation will shut down the frequency band. Quick
shutdown of the frequency band can also be achieved by holding the down arrow. When the
frequency band shuts off all of the orange and green LED lights for that frequency band will
flash every 2 seconds.
2) 1900mhz manual gain control Press again. The 3 orange LED lights for the 1900 mhz band
will flash together. Use up or down arrows to adjust gain in this frequency band if desired.
Each push of the up pr down button will adjust 2 dB of gain. Total manual adjustment range
is 30 dB. Adding more than 30 dB of attenuation will shut down the frequency band. Quick
shutdown of the frequency band can also be achieved by holding the down arrow. When the
frequency band shuts off all of the orange and green LED lights for that frequency band will
flash every 2 seconds.
3) Manual gain LED display Press again to display the LED status of your inputed manual gain
settings then power the booster OFF/ON for manual settings to take effect. Each time you
cycle to this 3rd setting you will see your inputed manual gain settings displayed on the LEDs.
Note: the booster will remember manual settings through power on and off conditions. If you
want to return the booster to ‘Fully Automatic Mode’ you must go through step 1 and set the
800 MHz gain control to full gain (four green LED lights solid ON), then go through step 2 and
set the 1900 MHz gain control to full gain (four green LED lights solid ON). Power the booster
OFF and then ON for ‘fully automatic mode’ to take effect.
Important:
a) for manual settings to take effect, the booster must be powered OFF and then ON.
b) manual settings cannot override the automatic functions of oscillation and high power
controls. This means that if you are trying to set a gain level higher than the automatic control
functions allow, the manual gain settings will be limited by the automatic control functions.
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