Kantronics Skip over section links
Site Map
Digital Data * Radio Communication * GPS Tracking
Company Info |  News |  Applications |  Support / Resources |  Order

Skip over product links

KPC-3+ Packet Communicator

  Features |  Specifications |  App Notes |  Accessories  

View/Download (PDF format):
KPC Brochure (200k)   KPC-3+ Port Pinout (46k)   KPC-3+ Manual (1976k)


KPC-3+ front view

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!

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 modes
  • "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  
    Voltage DC 6 V to 25 V
    Current < 30 mA (LEDs on, unit active)
< 15 mA (LEDs off, unit inactive)
External Power Connector 2.1 mm coaxial, center pin positive
Internal Power Connector Circuit board accommodates user-installed 9 V battery connector
External Signal Ports DB-9 female (radio port)
DB-25 female (computer/data terminal)
PTT Watchdog Timer Period approx. 2.5 minutes
External Carrier Detect Pulldown 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 Output Open drain, max +50 V dc, max 200 mA
Audio Output Level Continuously adjustable from 1 mV p-p to 4 V p-p
Audio Output Impedance 600 Ohm, AC coupled
Modulation 1200 bps FSK full duplex CCITT V.23
Audio Input: 1300 Hz/2100 Hz
Sensitivity 5 mV p-p
Dynamic Range 70 dB
Input Impedance Unbalanced, 10 kOhm
(600 Ohm with jumper J 3 installed)
Max Audio Input Voltage ±12 V dc; 35 V p-p sinusoidal
Operating Modes Packet, WEFAX, KISS, XKISS, HOST, GPS, MODEM (RX only)
LED Indicators Power, Xmit, Rcv, Connected, Status, Mail
(user option on/off)
Remote Control Access All controller functions, user-defined password
External Reset Pulldown to ground
Operating Protocols AX.25 Levels 1 and 2 (user-selectable)
Compliance FCC Class B; Europe - CE Conformity

Specifications subject to change without notice or obligation.
APRS® is a registered trademark of Bob Bruninga, WB4APR.
All registered trademarks remain the property of their respective owners.

Kantronics  •  14830 West 117th Street,  •  Olathe, Kansas 66062
Phone (913) 839-1470  •  Fax (913) 839-8231  • 
Kantronics Home | Top of Page ©2005-2014 Kantronics LLC.