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In Building Solutions

BDA Systems

Wireless users expect and rely on communications wherever they go, including inside large structures, high rise buildings, underground parking, malls, basements, subways, etc.

When wireless radio frequency (RF) signals pass through any material they lose strength.  When the RF signal levels fall below a given amount, communications become either unreliable or completely stop.

Whenever the area needing radio coverage is below grade (underground,) it is almost certain an RF distribution system will be needed.

The primary components of an amplified RF Distribution system are identified below:

  • Donor (roof) antenna: This is called the “DONOR” antenna.  It is usually mounted on the roof or side of a structure where a clear line-of-sight path exists to the distant radio tower.  The distant site is also known as the “DONOR.”
    • This is a two-way interface:
      • The “DOWNLINK” is the RF signal direction going INTO the structure.
      • The “UPLINK” is the RF signal being sent back OUT of the structure.
  • BDA (Bi-Directional RF Amplifier):  This is a very specialized RF amplifier which selects what frequencies are to be amplified in the downlink and uplink paths (they are different,) and increases the RF signal strength in both directions.  The FCC calls these amplifiers ‘signal boosters.’   There are very specific federal rules on their operation that should be followed by the system designer.

  • The RF distribution network:  The most common method is to use coaxial cables.  The Coaxial cables fall into two classes; standard (non-radiating) and radiating.

BDA Manufacturers for Public Safety include:

TxRx:



G-Wave Solutions: