250 Watt VHF Paging Transmitter

The RFI-148 250 is a high power paging transmitter with true digital DPS frequency generation that enables precise control and flexibility for a wide range of data transmission applications.

The transmitter is particularly suitable for large simulcast POCSAG and FLEX paging networks.


Paging Transmitter 250W
  • High power output (selectable from 20 W - 250 W)
  • SNMP diagnostics and alarms
  • Full VHF Band coverage (138 - 174MHz)
  • DSP precision modulation
  • Integrated isolator
  • Sniffer port for in-rack receiver
  • Remote firmware upgrade capability
  • 110-250 VAC, 24 VDC and -48 VDC versions available
  • Software selectable frequency offset
  • Adjustable absolute delay correction
  • Front panel indicators for power output and diagnostics
  • Hardware alarm outputs
  • High frequency stability and external reference option


Paging Network

The RFI-148 100 is suited for applications in city and state wide paging systems for Commercial, Health and Emergency Services usage where reliable simulcast overlapped coverage is critical.

This transmitter can be used as a stand alone unit for covering a campus or building, or as a part of a large wide area network with almost any paging terminal vendor.

The transmitter can also be installed in place of other transmitter brands in an existing VHF paging network


Multiple Paging Protocols    The transmitter can be used with all industry standard POCSAG and FLEX paging formats.
Output Sniffer Port    A separate port with output power relative to the transmitter output allows a diagnostics module to check the outgoing RF message for integrity and transmit power level.
Absolute Delay Correction    The transmitter absolute delay setting can be configured for multisite networks to account for different upstream paths from the paging terminal to the transmitter sites.
Frequency Offset    Configurable frequency offset allows for multi-site frequency planning to eliminate ‘zero beating’ and RF nulls.
Remote Diagnostics    Windows™ software allows remote Ethernet connection to the transmitter for configuration, diagnostics and firmware upgrade.
Smart Protection    Configurable alarm thresholds and transmitter actions allows user configurable levels of automatic protection for on-site equipment.
Integrated Isolator    Integrated fan cooled and temperature controlled isolator means a damaged or missing antenna system can be remotely diagnosed.
Reliability    Superb environmental control, improved amplifier efficiency and a design optimised for reliability makes the RFI-148-250 one of the most reliable high-powered paging transmitters available.



19” Rack mount, 4RU high,
480mm x 395mm x 177mm
Weight: 12.5 kg – 14 kg (model specific)
Construction: Welded and passivated mild steel, aluminium powder coated front panel

Frequency Range: 138 MHz to 174 MHz
Duty Cycle: Up to 100%
Transmit Power: 20 W to 250 W software selectable in 1 W steps
Channel Bandwidth: 25 kHz, 20kHz, 12.5kHz
Frequency Raster: 25 kHz, 20 kHz, 12.5 kHz, 10 kHz, 6.25 kHz, 5 kHz
Frequency Stability: 1ppm standard
(external reference input available)
Compliance: AS/NZS 4769.1 2000, AS- 4295:1995
CFR 47 Part 15 and Part 90:
ETSI EN 300 113; ETSI EN 301 489; EN
60950; RoHS (scheduled)

Operating Voltage:
AC:100 VAC to 250 VAC, 50 to 60 Hz
DC: +20 VDC to +31.2 VDC (24 VDC version)
-40.5 VDC to -57 VDC (-48 VDC version)
Operating Current (AMCA, FCC):
- Transmit 250W 17.28 A @24 VDC
- Transmit 100W 11.58 A @24 VDC
- Transmit 25W 5.85 A @24 VDC
- Standby 0.60 A @24 VDC
- Transmit 250W 10.31 A @-48 VDC
- Transmit 100W 6.51 A @-48 VDC
- Transmit 25W 3.42 A @-48 VDC
- Standby 0.50 A @-48 VDC
Operating Temp: -30 to +55 deg C
Operating Humidity: Up to 95% non-condensing relative humidity


Data Interface: Asynchronous POCSAG, Synchronous ERMES / FLEX
POCSAG: 512 / 1200 / 2400 (2-FSK)
FLEX: 1600 / 3200 / 6400 (2/4 – FSK)

Frequency Reference: Internal (TCXO) or external (GPS) with
automatic switch-over
Carrier Offset: Up to 5000 Hz (1 Hz steps)
Absolute Delay: 0 to 40ms (5 us steps)

Windows™ management application for local or network configuration and diagnostics.
Remote diagnostics via SNMP.

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