MRP40 Morse Code Decoder & Sender


MRP40 is a powerful and highly-effective ham radio software program that decodes received CW audio that has been fed to a computerís sound card. The decoded text is displayed on the computerís monitor. For transmitting CW, the program encodes keystrokes from the computerís keyboard. Hams use MRP40 to send and read QRQ (high-speed) CW, to help read weak DX signals, and to improve CW contest scores.

... With MRP40 you are number one on the air! ...


Tips 'n Tricks essential to get best decoding results with MRP40

MRP40 is compatible with:
Winkeyer USB by K1EL
DigiMaster CW Interface by G4ZLP
SignaLink (recommended)
Rigblaster Advantage (click here to see on page 32 how to set)
Microham USB Interface II and microHam microKeyer II
Or just do it yourself: Galvanic isolated PC to RIG interface

Very good decoding of weak, noisy and fading signals
Almost 100% copy in heavy CW contest conditions and local QRM
Decoding now better than famous MRP37 Morse Decoder (MS-DOS version, no longer for sale!)

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...
Transmitting Morse Code 0.4 to 60 WPM via USB-COM Port, Soundcard and Winkeyer
Beacon transmitting mode

There are 3 ways to transmit:
1. Recommended: Use AFSK (audio frequency-shift) keying by sending CW audio to the transceiver from the computerís sound card. The rig operates in SSB transmission mode. The signals generated by MRP40 have sine waveform and a smooth envelope, so no annoying key clicks. The rise and decay times of the CW-signals are automatically adjusted to the sending speed, so a minimum bandwidth is occupied, especially for QRS (slow sending). Note: When using AFSK for sending, one can activate the PTT via Com Port by selecting the check box named "Activate PTT pin" in MRP40's menu under "Options - Tx-Settings."

2. Key your transceiver via the RS232 serial Com Port, or key your transceiver via Soundcard output. This requires an interface box between PC and transceiver. You can also build yourself a neat little interface like suggested in QST Magazine issue 02/2007. Click here and study the article.

3. Winkeyer USB

To ensure galvanic isolation between computer and transceiver, we recommend using an interface box from SignaLink

Click here to read more details about the MRP40 features

Click here and study the MRP40 online help documentation

In the February 2016 Journal of RSARS OM M0OIC is encouraging others to opereate CW using MRP40 without a key

System Requirements:
Soundcard: any general purpose. ( e.g. PCI or On-Board Sound)
CPU: Pentium 450 MHz or faster
Operating System: Win95 / Win98 / WinMe / Win2000 / Win XP / Win 7, 8, 10 / Snow Leopard / Parallels Desktop 5
Mac running OS X 10.7 and using Windows 7 running in Parallels 7

Anti Virus Settings:
In case when running the program after pressing the "TRY" button the " program terminates without any error:
Please inside your anti virus software add MRP40 to the List of trusted programs
F-Secure internet security:
If "deep guard is enabled" with "advanced process monitoring" enabled then MRP40 is placed in the "monitored programs list" and is prevented from running.
This is easily fixed by either disabling "advanced process monitoring" or remove MRP40 from the monitored programs list in F-Secure.

Read Article from Bryan M0OIC about MRP4062 on
- Apple iMac i7
- Parallels Desktop 5

Problem Solutions:

"Runtime error 2005401480" can happen when the recording device has been removed from the list of windows recording devices. To see the the list of windows recording devices right click on the speaker symbol in the windows taskbar.Click on Recording devices. Inside the window right click in some empty area and check boxes:
- Show Disabled Devices
- Show Disconnected Devices
Select your device and set as default. Restart MRP40

"Runtime error 429 activex component can't creat object"
This means that one of the delivered .dll or .ocx files is no longer registered in the windows registry. Typically re-installation of MRP40 helps. Alternative solution: Search on your PC the file dx8vb.dll and register that file manually. Click here for instructions.

Version History

MRP40 Version 66:
Bug Fix for Winkeyer
During typing ahead MRP40 now continues to decode until send button is clicked

Adjustable delay between PTT and Tx:
Click -Options -TxSettings -Edit Com Port Configuration...
edit delay to any value between 1 and 1000 (milli seconds)

Tx Beacon function with adjustable delay:
Right click the text button labeled as "Beacon" and adjust the <beacondelay x>
For x enter any value between 1 and 3600 (seconds)
To make any text button act as a beacon just add the the string <beacondelay 3> at the end of the text

MiniLogBook has now a Data Base Lookup:
As soon as a new call is filled in MiniLogBook the Lookup will show name and location of that call
click -Options -show -MiniLogBook
check the box QRZ DB Lookup
enter your Login Details

Sending CW via Winkeyer USB is now fully supported:
click -Options -TxSettings -Send via Winkeyer
In the pop up window "RS232 Comport Configuration" enter a valid com port number the winkeyer is linked to.
click save
The checkbox "SideTone" allows you to enable/disable the side tone of the winkey device.

AFC Functions improved:
The state of AFC is now remembered at startup of MRP40 (factory default is AFC OFF)
New Smart AFC: Every time the two red lines (representing the RX Filter frequency) are moved manually by left mouse click or by (Auto-) GoMax -Action the AFC is acting for 4 seconds with double speed doing precise fine tuning to the incoming signal. During that 4 seconds the RX frequency is gradually "frozen in" At the end it is fixed and steady. You stay receiving exactly at that perfectly tuned frequency.
The smart AFC is activated even the AFC Check box is in "OFF" State
Performing right mouse click to move the red lines will not activate the Smart AFC

Receive Text Box now has a vertical scroll bar

Minimum Rx and Tx speed is now adjustable (factory default is now 10 WpM)
Click -Options -RxSettings -Set minimum Speed
The advantage of setting a minimum speed with a relative high WpM rate is that MRP40 does not "Drift" down to for example 2 WpM and then is no longer able to recognize an incomming station with 20 WpM

- PTT function can be disabled completely
- Bug Fix regarding USB to RS232 Serial Adapter: Now proper timing of first "Dot" during CW sending via ComPort
- Typing the ESC-key will stop the ongoing sending action and clear the Tx text box
- Mini Log Book integrated: A neatlitle tool to log your contacts. It automatically looks up previous contacts with recent call. It supports ADIF record format.
To launch the MiniLogBook run MRP40 and click -Options -Show ... -MiniLogBook
To learn more about comfortable operation refer to the Help Documentation. Run MRP40 and click
- Help -English -User interface -Program Menu -Options -Show then scroll down to section "MiniLogBook"

- Graphic Display improved:
- now double dynamic range for signal amplitude: color transists from black into bule into light blue into white (see screen shot above)
- now double frequency resolution: display of incoming signals is more sharp; much less side lobes visible.
- now double time resolution: length of short dots is displayed more accurately
- Default text font size is appied when window is resized
- Green Volume indicator for soundcard signal corrected:
-the vertical display range now represents 1:1 the physical signal range of soundcard ( please keep volume moderate, avoid cliping at top )

- Bugfix: Click noise during sending via soundcard eliminated
- Windows 7 Support added: Audio Control Panels (Mixer sndvol32.exe ) included in Installation Package

- Sending is continued even if you work other applications
- Tx sending via Soundcard Audio Tones added
- Bug Fix for soundcard selection (Tx) done
- Set Audio Tx Frequency equal to Rx Frequency (helpfull to perfecly match the frequency of remote CW station ( your tranceiver does Tx in SSB mode the soundcard audio out signal)
- Choose any COM Port Number for CW Sending ( PTT and Key )
- Activation of PTT pin during sending via soundcard audio

Reports from Hams who have tested MRP40 click here

Product Review on click here search for MRP40

Download full functional free MRP40 Trial Version. Try before buy!

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More Info
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Useful Links:

Nu Ware: The ultimate Morse code training software

PA3BWK's Ultimate Morse Code Web Site

Amateur Radio Internet Guide

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Software für viele Betriebsarten.