Product made in Japan

Manufacturer : Koizumi Sokki

Model : KRM-920

Characteristics

The KRM-920 is a data communication modem that uses an unlicensed specified low-power radio standard. High-speed communication is possible compared to the 400MHz band specified low-power radio and digital simple radio.

By making serial communication wireless, it can be used for telemetry data transmission such as water level, rainfall, temperature and humidity, and correction information transmission of RTK-GNSS.

Features

• No license required Specified low-power wireless modem
  920MHz band specified low-power wireless standard
  high speed (data communication speed 50kbs)
  Long-distance data communication with 20mW output (outdoor visibility 1200m)
• Lightweight, compact, waterproof design
  Body size: W70 H118 D35 (mm) Antenna: 190 (mm)
  Weight: 220 (g)
  Protection grade: IP54
• Interference prevention with multi-channel function
  Group operation with 3 frequencies. Automatically selects a frequency that can be communicated.
  10 channel frequency groups selectable.
• relay function
  
  Up to 2 units can be installed as repeaters between the sending and receiving sides to extend the communication distance.
  The relay route is determined by the sender’s settings. (When using in relay mode, it will be operated at the frequency of one wave.)
• 1:1 1:N communication function
  
  In addition to 1:1 communication with a designated destination, you can also select 1:N communication that simultaneously transmits to multiple transceivers.
  By using simultaneous transmission with RTK-GNSS, correction information can be sent simultaneously from one reference station to multiple mobile stations.
• Can be operated without an external power supply
  
  It uses a lithium polymer battery that can be used continuously for 10 hours.
  The voltage of the charging terminal is DC5V. It can also be charged on site using a mobile battery.
• 1/4 inch mounting screw
  
  There is a 1/4 inch screw hole on the bottom of the main unit. It can be attached to a camera tripod.
  If you use the dedicated mounting bracket, you can easily attach it to the RTK pole and manage it neatly.
• External power supply type (special order specification)
  
  This model assumes a power supply from an automotive battery (12V/24V).It can be driven with a power supply of DC8V to 12V.