Key Features

  • Fully assembled and tested
  • Dual modes: K3NG’s CW Keyer and K0SM’s TinyFSK
  • Opto-isolated, ground-independent outputs
  • RF chokes and bypass caps on all input and output lines
  • CW sinewave Sidetone from internal speaker
  • CW speed pot
  • Nine status LEDs – power, CW mode, RTTY mode, plus PTT/CW/FSK for Radios 1 and 2
  • AUX I/O feature for external speakers, keyer pushbuttons or ???
  • Simple Plug & Play installation and operation
  • One radio SO1R/SO2V (Single Operator 1 Radio, Single Operator 2 VFO) operation in CW and RTTY for Simplex & Split operation
  • Two radio SO2R (Single Operator 2 Radios) operation in CW and RTTY with cooperating software
  • Standalone (no PC required) CW paddle operation with USB battery pack (not included)
  • Small, lightweight, portable for mobile, Field Day and back-country treks (perfect for SOTA and POTA)
  • Rugged Crush-resistant and RFI-repellent metal enclosure
  • Flash upgradeable and software reconfigurable
  • For Developers and the DIYer (Do It Yourselfer), Mortty v5 source code available in K3NG’s collection

By Hams, For Hams

Required Materials

  • CW Operation: Logging software that supports the K1EL Winkeyer (v23)
  • RTTY Operation: Logging software that supports K0SM’s TinyFSK
  • Cables to connect Mortty’s ouput jacks to your transceiver’s CW, PTT and FSK input jacks (see >Get Started >Install for details)
    • NOTE: 3 foot USB-A to USB-C cable included in the package


  • SIZE: 25mm (H), 40mm (W), 50mm (D) [1″x1.5″x2″]
  • WEIGHT: 0 pounds, 2.8 ounces
  • POWER: 5 volts DC (USB-C, cable included) @ 10ma (nominal) and 270ma max (CW sidetone at max volume)
  • PROCESSOR: Raspberry Pi RP2040 microcontroller, 125 MHz, 16MB
  • CPU BOOT TIME: less than five seconds
  • USB COM DRIVER: Microsoft Windows 7-11 (no special driver required)
  • OUTPUTS: transistor optocouplers, LTV217, max 80 volts @ 50ma
  • MODES: CW (K3NG CW Keyer) and FSK RTTY (K0SM TinyFSK)
  • CW COM PORT SETTING: 1200 baud, 8, N, 1
  • CW CHARACTER SET: international morse code
  • CW SIDETONE: sinewave, internal speaker, 300 – 1600Hz
  • CW SPEED MAX WPM: >100 word per minute (logger max). CPU/opto output max TBD
  • CW SPEED POT RANGE: 5 – 55 words per minute (logger configurable)
  • RTTY COM PORT SETTING: 9600 baud, 8, N, 1
  • RTTY CHARACTER SET: international 5 bit baudot code
  • RTTY SPEEDS: 45.45, 50, 75, 100


This device and its software control equipment that could be damaged by said device. You are responsible for installing, configuring, testing and ensuring that the device performs properly in your environment. The Mortty v5 developers cannot be held liable for any direct, indirect, consequential or incidental damages to other pieces of software, equipment, goods or persons arising from the use of this device.
By purchasing this device and operating this software you accept the above terms of copyright and disclaimer.

Scroll to Top