In-building DAS and Emergency Responder Radio (ERCES)

Emergency responder radio coverage

In the United States many jurisdictions require in-building coverage for fire and police radio. The requirement comes from the International Fire Code (section 510) and NFPA 1225, as adopted locally. The authority having jurisdiction (AHJ) sets the frequencies, the coverage targets and the acceptance test. System listings and acceptance are handled by the system integrator with the AHJ.

Bands commonly carried

Service	Typical frequencies
VHF / UHF public safety	150–174 MHz, 450–470 MHz (470–512 MHz in some cities)
700 MHz public safety, incl. FirstNet Band 14	758–768 / 788–798 MHz (Band 14); 769–775 / 799–805 MHz (narrowband)
800 MHz public safety	806–824 / 851–869 MHz
Cellular DAS	LTE and 5G bands of the operators served, e.g. Band 28, 20, 8, 3, 1, 7 and n78

Where cavity filters go

• Signal booster / BDA band selection. Pass the licensed channels, reject adjacent services.
• Point of interface (POI). Band combiners and duplexers join several operators’ signal sources onto the DAS.
• Shared cabling. Combiners and diplexers separate public-safety and cellular systems on one riser.
• Low PIM. Passive intermodulation from strong downlink carriers can land in uplink bands, so low-PIM parts matter at the POI. Low PIM is an order option on our datasheets.

Related products

• KXT-BF-758803: bandpass, 758–803 MHz.
• KXT-CM4-WIDE: 4-port combiner, 758–960 / 1805–1920 / 2010–2170 / 2310–2675 MHz.
• VHF/UHF duplexers for the public-safety radio side.
• Cellular bandpass filters and combiners

What to send for a quotation

The band plan for each system, the rejection or isolation between them, power at the filter, connector, and quantity. A riser diagram or POI drawing can be attached on the custom design form.

Send a band plan All applications