Private Radio Networks: TETRA, P25 and DMR

Where the systems operate

Frequencies are set by each country’s regulator and each licence. The usual ranges are:

System	Standard	Typical bands
TETRA	ETSI EN 300 392	380–400 MHz (public safety in many countries), 410–430 MHz, 450–470 MHz; 800 MHz in some regions
P25 (APCO-25)	TIA-102	VHF 136–174 MHz, UHF 380–512 MHz, 700 MHz and 800 MHz public-safety bands
DMR	ETSI TS 102 361	VHF 136–174 MHz, UHF 400–470 MHz

Where cavity filters go

• Repeater duplexer. Transmit and receive share one antenna. The duplexer passes each half of the pair and isolates the receiver from the transmitter at the duplex spacing.
• Receiver protection. A bandpass cavity in front of the receiver rejects nearby transmitters on shared towers.
• Transmitter combining. Multi-channel and trunked sites combine several transmitters onto one antenna.
• Coexistence with cellular. Band filters keep LTE and 5G energy out of the radio path, and the other way round.

Related products

• KXT-FF-09: UHF cavity duplexer, 452.5–457.5 / 462.5–467.5 MHz (factory sheet).
• KXT26065: duplexer, 135–210 / 400–500 MHz (passbands only on the quotation).
• All VHF/UHF duplexers

What to send for a quotation

Tx and Rx frequencies (or band and duplex spacing), channels and power per channel, the isolation or rejection you need, connector, and quantity. Use the custom design form; a drawing or site plan can be attached.

Send a band plan All applications