Telewave.io Filters for Emergency Responder Radio Communication Systems

An Emergency Responder Radio Communication System (ERRCS) is an extension of a Public Safety Land Mobile Radio (LMR) system into a large building or other structure where the primary LMR signals are blocked by the structure.  These systems typically employ an external “Donor” antenna, a Bi-Directional Amplifier or Repeater (BDA), and an Internal Distributed Antenna System (iDAS). Each ERRCS is custom-designed for each host LMR system and each building or structure. Telewave.io supplies Donor antennas, and Radio Frequency (RF) filters that are crucial to the proper operation of the ERRCS.  Many structures today require an ERRCS and certification of the ERRCS to obtain approval to be occupied.

HealthSignals, LLC UHF in-building Distributed Antena System (iDAS) duplexer used for their Chelsea Fairlawn project

Telewave.io filters solve two problems that arise when designing and implementing an ERRCS.  RF Energy leakage (Cross Talk) between the Uplink (UL) and Downlink (DL) that causes the DBA to malfunction; and wideband RF noise that is received on either side of the BDA, amplified and “re-transmitted” out the other side of the BDA (causing RF noise pollution).  The custom-designed Telewave.io filter solution solves both problems by providing narrow-band “windows”.  The filters only allow frequencies used by the local public safety agencies through the BDA, reducing RF noise pollution.  The filters also prevent leakage of RF energy from either the UL or DL path of the BDA to the other path, allowing the BDA to properly function. The filters can be designed to support multiple channels (multiple agencies) and close UL/DL spacing.

Telewave.io filters are passive and can be fitted into cabinets that are water resistant and meet requirements for an ERRCS as specified in UL-2524 and NFPA-70.  The Telewave.io custom solutions are compatible with any ERRCS BDA or iDAS antenna system. 

Contact Telwave.io at 408-929-4400 Option 3 or email support@telewave.com for assistance with your project.