HPT404BT UHF Radio Transceiver

JAVAD HPT404BT 4W UHF Radio Transceiver

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The HPT404BT 4W UHF radio transceiver from JAVAD GNSS provides a high-speed point-to-point and point-to-multipoint wireless data transfer at up to 38.4 kbps, at a maximum range of 16 miles (26 km).



The HPT404BT 4W UHF radio transceiver from JAVAD GNSS provides a high-speed point-to-point and point-to-multipoint wireless data transfer at up to 38.4 kbps, offers USB/Bluetooth® capabilities, and an optional built-in quad band GSM/GPRS module.

The HPT404BT accesses VRS network using via GPRS, takes incoming data from the network, modulates it with GMSK, FSK, PSK or most spectrum efficient QAM modulation and transmits it at RF power output levels from 15 dBm up to 36 dBm operating in UHF frequency band (406 to 470 MHz).

The HPT404BT is also capable of receiving RF signal from remote UHF transmitter, and the data could be send over the cellular network using built-in GSM/GPRS module if such operation mode is selected.

The HPT404BT firmware supports user selectable modulation techniques (GMSK, 4FSK, DBPSK, DQPSK, D8PSK, or D16QAM), which allows the user to achieve the highest data speed for a given range (up to 16 miles/26 km). It also includes a selectable error correction, which improves the functioning of the radio modem under interference.

The sophisticated features of the HPT404BT include data scrambling, frequency hopping, user selectable transmit output power level, low power consumption sleep modes, autoscanning for base and plug-and-play installation for remote terminals.

The built-in software tools provide the wireless link testing, unit’s status and error statistics monitoring as well as unit’s settings change over the air. The firmware of the HPT404BT radio modem resides in a flash memory. The updating of the radio modem programs is entirely software-based. The flash memory is re-programmable through an RS-232 interface, USB, Bluetooth, or over the air.


  • 16 miles (26 km) maximum distance range
  • Full speed USB 2.0 device port
  • GSM/GPRS quad band 850/900/1800/1900 module (optional)
  • Bluetooth® interface
  • Data speed over the air 38400 bps at 25 kHz and 19200 bps at 12.5 kHz
  • Programmable output power (32 mW to 4 W)
  • Advanced forward error correction (FEC)
  • Serial port configurable as RS-232 or RS-422, or RS-485
  • Data speed over the serial port 9600 to 115200 bps
  • Testing, monitoring and control of the unit over the air
  • AlphaWave SuperScan® – automatic search and select for best frequency/channel

Technical Specifications

Operating Frequency Range:406-470 MHz (EU); 406.1-470 MHz (USA); 406.1-430 MHz, 450-470 MHz (Canada)
Channel Bandwith:25/12.5/6.25 kHz (USA for 406-420 MHz); 12.5/6.25 kHz (USA for 421 -470 MHz); 25/12.5/6.25 kHz (Canada); 25/20/12.5 kHz (EU)
Nominal Impedance:50 Ohms
End to End Delay:60 ms
Communication Mode:Time Division Duplex (TDD), Time Division Multiple Access (TDMA)
Maximum Distance Range:16 miles (26 km)
Output Power:USA, Canada: 15 dBm to 36 dBm in 1 dB steps (32mW to 4W); EU: 15 dBm to 33 dBm in 1 dB steps (32mW to 2W)
Output Power Control Accuracy:±1.5dB (at normal test conditions); +2.0dB and -3.0dB (under extreme test conditions)
Carrier Frequency Stability:±1.5 ppm initial stability over temp with ±3.0 ppm aging/year
Max. Frequency Error:±1.0 kHz (at normal test conditions); ±1.5 kHz (under extreme test conditions)
Adjacent Channel Power (Conducted):25/12.5/6.25 kHz CS (USA, Canada) Part §90.210 (C, D, E); 25/20/12.5 kHz CS (EU) Clause 4.2.4 EN 300 113-2 (60 dBc)
Spurious Emission (Conducted):-36 dBm (9 kHz – 1 GHz); -30 dBm (1-4 GHz)
Spurious Emission (Radiated):-36 dBm (9 kHz – 1 GHz); -30 dBm (1-4 GHz)
Noise Figure:4 dB
Dynamic Range::-115 to –15 dBm
Max. Input Signal Level:-10 dBm
Power Supply Voltage:+9 to +36 VDC nominal
Power Consumption:18W/2W/0.01W – Transmit/Receive/Sleep (average)
Operating Temperature:-40°C to +70°C
Storage Temperature:-40°C to +85°C
Enclosure:Aluminum, IP67
Dimensions:146 mm x 75 mm x 44 mm (5.75 in x 2.95 in x 1.73 in)
Weight:488 g (1.07 lbs)
Housing Color:Two-tone Green/Gray
Antenna Connector:TNC, 50Ω
FCC:Part 90
Industry Canada:RSS-119
R&TTE:ETSI EN 300 113-2, ETSI EN 301 489-5, EN 60950-1:2006

Why Buy from Us?

In business since 2004, Canal Geomatics is an authorized dealer for JAVAD GNSS and has established itself as an industry-leading distributor of high-precision positioning products in North America. Our mission is to find the best solution for each unique application and extend premium support to ensure the long-term success of our customers. We offer both volume and reseller discounts for the majority of our product lines.


The AW435BT 4W UHF radio transceiver from JAVAD GNSS is available through Canal Geomatics. If you would like more information about this product, please feel free to get in touch with us by completing the Request Pricing form.