The device detected that the external antenna is too close to the internal antennas. The booster will shut
down automatically to protect the system from damage. It will restart after the problem is resolved.
Solution: Ensure good antenna isolation.
• Keep minimal distance (10 - 20m) between the outdoor and indoor antennas. The stronger input
signal, the larger distance between antennas should be.
• Never point the external and internal antennas face to face, they must aim opposite or frankly
different directions to avoid the risk of interference.
• Use mineral or metal obstacles such as walls, ceiling, metal or concrete slab, etc. to keep the
antennas out of sight of each other.
Questions & Solutions
What signal level in dBm is optimal for the correct booster functioning?
For the optimal functioning of the booster, the BS (input) readings should be between - 65 and 50 dBm.
The MS (output power) readings must be b05 and +15 dBm. Device Gain must be 65/65 dB. If
the BS is lower than - 65dBm, the coverage will be smaller. However, the device can work normally. If the
BS is too weak, it'll be necessary to adjust the position of the outdoor antenna by raising it as high as
possible (on a pole on the rooftop) and pointing it towards the provider's nearest base station. If the BS is
higher than - 50 dBm, the device will have a self-excitation issue. In those conditions, the output signal will
drop during communications. If the two antennas are placed very close to each other, it will evoke self-
excitation. To fix the problem, you would need to place the outdoor antenna at the largest possible
distance from the indoor antenna.
7.4. System Test
7.4.1. Check whether the coverage is good
1. Take a test with a mobile phone or a data card (engineering mobile phone is preferred).
To test signal level with a cell phone, make use of its engineering mode (Field Test Mode), which
is an application available in free access or a phone mode requiring no extra setups. On most
used mobile OS (operating systems) the test mode can be started as follows:
◦ iOS. Type *3001#12345#* and hit Call
◦ Android. Type *#*#197328640#*#* to activate
◦ Windows. Type ##3282# and start.
◦ Blackberry. Press TOOLS, SETTINGS, STATUS or OPTIONS, STATUS.
Note! To get parameters for 2G, 3G and LTE, disable WiFi. In case you cannot find Field Test
Summary of Contents for BD-300GDW
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