12-90-0000 UHF Transceiver & Repeater
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12-90-0000 UHF Transceiver & Repeater

The 12-90 is a simple to configure POCSAG paging transceiver with high sensitivity receiver combined with a 60mW transmitter.


The 12-90 is a simple to configure paging transceiver with high sensitivity receiver combined with a 60mW transmitter. It operates over the frequency range of 440-470MHz decoding and encoding 512 or 1200 baud, alphanumeric or numeric messages.

The 12-90 can be controlled via a serial interface to provide numeric, alphanumeric and tone-only encoding. This enables a user to call a pager, append a priority level (1 of 4), and add a numeric or alphanumeric message.

The unit supports multiple message queuing of up to four 80 character messages, or as many smaller messages that will fit into the memory buffer.  Full batching of serially queued and input messages ensures that messages are transmitted with minimal transmit on time.  Pre-defined input messages limited to a length of 40 characters can be configured using any serial terminal application. 

Two discrete inputs are supported with different pre-programmed messages on high and/or low transition.  Provision to transmit a message more than once and variable time between transmissions are catered for.

The 12-90 supports Salcom relay control protocol to control one on board relay plus several “virtual outputs”.  Virtual outputs can be used to remotely trigger input or periodic messages and provide a mechanism to acknowledge reception of messages.  Using a virtual output, it can transmit the received signal strength of the last received message allowing receiver positioning and system health to be monitored.  It can be configured to respond with checksum information of the last received message.

Expansion of the 12-90 is possible using the 12-34 relay module and 12-32 input module, allowing any number or outputs or inputs to be supported. 

An intelligent self adjusting channel busy check is used to prevent message collision or corruption, reducing the need to re-transmit messages.

The 12-90 can be used as:

  • A full paging transceiver, allowing both the encoding and decoding of paging messages;
  • A stand alone receiver;
  • A stand alone transmitter with channel busy check function before transmissions;
  • An autonomous paging store and forward repeater with duplicate message reject;
  • A point-to-point raw serial link;
  • A simple telemetry solution.


Technical Specification

12-90-0000 UHF Transceiver & Repeater
Frequency Range 440-479MHz - UHF
Note: Custom 433MHz model available on request
Frequency Selection User configurable
Power Supply +13.8V typical (11 to 15 VDC range)
Power Consumption Standby: 33mA
Transmit: 150mA
Transmit Power 60mW
Channel Spacing 10kHz, 12.5kHz
Modulation FSK with NRZ data
Deviation ±4.5kHz
Receiver Sensitivity Approx -125 dBm
Receive Bandwidth 10kHz (suitable for 12.5kHz channel operation)
Baud Rates 512, 1200
Message Format POCSAG
Configuration Application Salcom Configuration Tool
Programming Cable 12-45-0000 (RJ12 to DB9)
Can be used with a USB to RS232 DB9 Serial Adapter Cable
Serial Port 9600 , N, 8, 1; RS232
Serial Protocols Salcom
Discrete Inputs 2 (Ground activated)
Discrete Outputs 1 Relay Contact (1A @ 24VDc)
Note: Not suitable for 240VAC Connections
Connectors Serial Port (RS232) = RJ12 (6P6C)
Inputs / Relay Output = RJ45 (8C)
Power Connector 2-way plug & socket, screw connections (supplied)
RF Connector 50Ω BNC
Environmental Protection Not suitable for outdoor use and should be protected from adverse environmental conditions
Operating Temperature -10ºC to +50ºC (+14ºF to +122ºF)

Power LED (Green)

   - Flashing (1s Freq) = Normal Operation
Status LED (Red)

   - On = Transmitting

   - Flashing = Error Condition
Weight 178g
Enclosure Dimensions 70mm x 100mm x 30mm (WxDxH)
Enclosure Material Extruded aluminium
Colour Matt black
Type Approvals   AS/NZS 4769.1:2000 + Amendment 1:2002 (RF)
EN 300-224-2  (RF)
FCC CFR47 Part 90 (RF)
FCC CFR47 Part 15 (EMC)
EN 301 489-2 V2.1.0 (EMC)
EN 60950-1:2006 (Safety)


Product Brochure 12-90 Product Brochure
User Manual 12-90 Product Manual
Configuration Tool 12-90 Configuration Tool

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