MRP37 is a software-based Morse decoder developed as an MS-DOS application by Polar Electric Engineering. It uses the audio output of your radio receiver connected to your computer's sound card to decode the CW audio signal to ASCII text. Now you can have a QSO at CW speeds of 20 wpm or more and make even more contacts during CW contests! And by careful listening, we think you'll notice an improvement in your own code copying ability.

Some of the notable features of MRP37 Morse Decoder include:

• audio level meter showing the intensity of the input audio signal;
• spectrum analyzer showing the relative strengths of input audio signal frequencies (from 55 Hz to 2700 Hz);
• ability to decode a selected signal (for example, to selectively decode one signal out of many nearby signals);
• automatic adjustment of frequency to compensate for drift in the audio signal;
• ability to automatically jump to the strongest audio signal;
• ability to automatically switch between two selected audio signals (for example, to monitor the QSO between two stations having a slight separation in transmission frequencies);
• automatic noise limiter reduces unreasonable decoder output and ignore most noise, spikes, and other interference;
• automatic gain control to compensate for heavy signal fading and other changing band conditions;
• real-time "storage scope" shows a time trace of the filtered audio signal amplitude;
• ability to decode Morse code at speeds from 5 to 200 words per minute (automatic readout of speed included);
• automatic saving of decoded text to a disk file for later use;
• ability to send Morse code via user-supplied connection between your serial port and the key input of your transceiver from 5 to 70 words per minute (simple construction details included);
• ability to send one of ten different fixed text files by press of a function key (for example, contesting information);
• ability to "repeat" decoded Morse code signals using PC speaker or COM port.

MRP37 will run from the DOS prompt, or in a DOS-window under Windows 3.x and Windows 95, but not with WIN NT.

The registered version decodes the Morse code signal as it is received. The demo version allows you to record a Morse code signal from your radio and decode it at a later time. We feel that after you test the program with your own hardware and prove the decoding abilities of the demo program, you will be eager to pay the low price we're asking for the registered version.

We offer some technical support to users of the demo version to help you overcome any difficulties. Contact us by sending e-mail TO: PEE@ProMail.com SUBJECT: MRP37 Tech Support

In the body of the message please include:

• the MRP37x version number (x);
• your computer configuration (as much detail as possible, especially sound card information); and
• a description of your problem. We will respond by e-mail as soon as possible (usually within a day or two).

For additional operating, setup, and troubleshooting information, see the text files included with the program files.

Polar Electric Engineering, 1998

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