The Kantronics KPC-3+ is engineered for dependable and versatile digital communications. This unit reflects many years of Kantronics experience and is built with an eye toward emerging applications. The KPC-3+ can fill a variety of roles. In use around the world, Kantronics Packet Communicators set the standard by which others are measured!

Kantronics, LLC

As a single-port radio modem/TNC compatible with the characteristics of UHF/VHF transmission bands, the KPC-3+ can be paired with a UHF/VHF radio to serve the following functions and applications:

  • "Keyboard to keyboard" communications
  • Digipeater
  • Personal Mail Box
  • Local area node
  • Remote control devices
  • Remote access of telemetry
  • Network node operation
  • BBS operations and message forwarding
  • GPS position transmitting and tracking (requires external GPS receiver with NMEA-0183 data output)
  • Data storage and retrieval
  • EMWIN Weather Information (additional software required)

You can carry a KPC-3+ into the field with a radio to form a mobile data terminal, or (with the addition of an external GPS receiver) a GPS mobile "tracker". Its flexible power requirements (6 ~ 25 Vdc) allow for maximum versatility. You can achieve many hours of use by installing a 9 volt battery inside the KPC-3+. Battery life can be extended by disabling the LED displays through a simple keyboard command.

KPC-3+ Features

  • "NEWUSER" mode provides a quick start for packet newcomers
  • Large capacity internal mailbox and mail forwarding feature
  • GPS operation mode allows use with APRS® or other geolocation software
  • Remote Control and telemetry functions with two A/D inputs and two control line outputs
  • Low power requirements (9 volt battery power capability)
  • Network node functions with standard "KA" Node and K-Net Node™
  • BBS, KISS, XKISS, HOST, TERMINAL, GPS and MODEM operating mode
  • "Online" HELP feature
  • Upgradeable as new firmware is released
  • Digital control of audio drive level -- set from keyboard or by remote control
  • Motorola® HC11 central processor
  • 512k memory standard (since 2nd quarter 2011)
  • Comes with data connector, data wire, coaxial power plug, detailed manual & software
  • Usable with base, mobile or hand-held radios

KPC-3+ Specifications

Dimensions (H×W×D)0.8"×5.2"×5.2" (21 mm × 133 mm × 133 mm) without projections
Weight11 oz (0.32 kg)
Power Requirements
VoltageDC 6 V to 25 V
Current< 30 mA (LEDs on, unit active) < 15 mA (LEDs off, unit inactive)
External Power Connector2.1 mm coaxial, center pin positive
Internal Power ConnectorCircuit board accommodates user-installed 9 V battery connector
External Signal PortsDB-9 female (radio port) USB type B (Computer)
PTT Watchdog Timer Periodapprox. 2.5 minutes
External Carrier DetectPulldown to ground
Analog Measurement Inputs (A/D Converter) Two inputs; 0 V to +5 V, 8-bit accuracy
Data Rate (radio port)1200 bps (default); 300, 400, 600
PTT OutputOpen drain, max +50 V dc, max 200 mA
Audio Output LevelContinuously adjustable from 1 mV p-p to 4 V p-p
Audio Output Impedance600 Ohm, AC coupled
Modulation1200 bps FSK full duplex CCITT V.23
Audio Input1300 Hz/2100 Hz
Sensitivity5 mV p-p
Dynamic Range70 dB
Input ImpedanceUnbalanced, 10 kOhm (600 Ohm with jumper J 3 installed)
Max Audio Input Voltage±12 V dc; 35 V p-p sinusoidal
Operating ModesPacket, WEFAX, KISS, XKISS, HOST, GPS, MODEM (RX only)
LED IndicatorsPower, Xmit, Rcv, Connected, Status, Mail (user option on/off)
Remote Control AccessAll controller functions, user-defined password
External ResetPulldown to ground
Operating ProtocolsAX.25 Levels 1 and 2 (user-selectable)
ComplianceFCC Class B

Specifications subject to change without notice or obligation.
APRS® is a registered trademark of Bob Bruninga, WB4APR.
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