MRP40 Morse Code Decoder & Sender is an advanced software for decoding and transmitting Morse code (CW) via audio. 

MRP40 decodes the CW using the computer sound card.

http://www.polar-electric.com/Morse/MRP40-EN/index.htm

Instructions in English, German, Japanese.

Let us summarize the functions and features that will be useful in choosing the best program for CW decoding:

Compatibility

 The software is compatible with various devices and interfaces, including Winkeyer USB, DigiMaster CW Interface, SignaLink, Rigblaster Advantage, Microham USB Interface II, and microHam microKeyer II. It's also possible to create a galvanically isolated PC-RIG interface.

Performance

Very effective decoding of weak, noisy, and fading signals.

Almost 100% copy in heavy CW contest conditions and local QRM.

Decoding now better than the famous MRP37 Morse Decoder (MS-DOS version, no longer for sale).

Features

• Morse Code Decoding up to 60 WpM.
• Text and Graphic Display.
• High-performance software CW filtering.
• Automatic speed recognition.
• Automatic Gain Control (AGC).
• Automatic tracking of "drifting" signals (via AFC).
• Automatic formatting of received text, correcting unspaced words.
• Beacon transmitting mode.

Transmission Methods

Using AFSK (audio frequency-shift) keying by sending CW audio to the transceiver from the computer's sound card.

Keying the transceiver via the RS232 serial port or sound card output.

Using Winkeyer USB.

System Requirements

Soundcard: any general-purpose sound card.

CPU: Pentium 450 MHz or faster.

Operating Systems: Win95 / Win98 / WinMe / Win2000 / Win XP / Win 7, 8, 10 / Snow Leopard / Parallels Desktop 5.

Additional Functions

MiniLogBook with QRZ.com database lookup.

Improved AFC functions.

Vertical scroll bar in the receive text box.

Adjustable minimum Rx and Tx speed.

Version

MRP40 Version 66: Bug fixes, improvements in transmission and decoding, additional functions like MiniLogBook, and AFC enhancements.