DMX-40+ Morse Code Transceiver
DMX-40+ Morse Code Transceiver
DMX-40+ Morse Code Transceiver
DMX-40+ Morse Code Transceiver
DMX-40+ Morse Code Transceiver
DMX-40+ Morse Code Transceiver
DMX-40+ Morse Code Transceiver
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IF SOLD OUT, come back and check again.  We put refurbished units in stock as they become available, and they disappear quickly!

Note: DMX-40 is out of active production at this time due to supply chain issues.


Tired of trying to learn Morse code? Searching for a state-of-the-art decoder/encoder companion for your multi-band base or portable station that keeps right on working when the band gets noisy, and doubles as a portable QRP transceiver? Stop looking! It’s here! The DMX-40 is revolutionizing amateur radio CW communications with its extraordinary ability to decode in noise, and delivering you more features than you think could be contained in this handy, ingenious little piece of equipment.

Hear CW in noise

PreppComm’s customers are impressed with its intuitive functions and ease of use. Finally you can extract clear text from CW in the noisiest of conditions. Really! And its built-in receiver is considered to be better for CW than transceivers costing much more!

As well as allaying the frustrations of seasoned operators listening to code, this fascinating pioneer product supports learners—either as they hear it coming in and see it translated into text on the interactive GUI, as they hear their keyboard-entered text translated to Morse code, or as they watch the decoder process their manual keying to sharpen their sending skills.

Any license level CW

Whatever your license level, you now have access to CW communications that you could not previously interact with for lack of proficiency in Morse code. The included keyboard provides a type-ahead feature, accesses frequency-memory lists at a stroke and quickly executes commands or unlocks commonly shared information via single-key shortcuts.

Your ham radio programs

You can define your own micro programs to focus on your chief ham radio interests and access them on the touch screen or keyboard. Calling and answering are automated and displayed, or replaced with your own micro programs. Touch screen convenience gives you a view of what’s in the type-ahead buffer and rapid entry into comprehensive help menus.

It is truly astonishing what a small package with a few microprocessors can do!

KEYBOARD IS INCLUDED!  Also check out our DMX-40 accessories!


Download Data Sheet      DMX-40 Videos      DMX-40 Review

DMX-40+ Morse Code Transceiver

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“I have been very impressed with your product. It’s leaps and bounds better then all the other hardware and software decoders I’ve used over the years.”  James Hannibal, KH2SR The Tech Examiner

“… yours has been working much better in high noise than any I have used available at Hobby Prices.”  Art Upton K8XG

“Within an hour of getting the DMx-40 decoder working with my transceiver, it matched and far exceeded the decoding performance of MRP40. With practice, this can only improve.  In a CW pileup, and full break in CW confusion. MRP40 decoded everything it heard, which was all the signals shuffled together. DMX tracked the one CW signal I selected, and plowed through the pileup.”— Daniel Lockhart,  KJ7YOJ

“A great service department makes a fabulous company. I’ll recommend your company to everyone I know who’s looking for a product and even better service.” — Robert Long, KI5NMP

“This radio has been a awesome rig with a great receiver that outperforms my Kenwood ts440. And then decoder of this rig is superior to my mfj encoder decoder.” — Michael Maddalena, KJ6KIZ

“I’ve set my DXM-40A in External mode with my Xiegu G90 yesterday when it arrived. It works very well and ignores noise. It works so well that I sold my K1EL Reader/Keyboard Keyer already today. It did not work well with any noise. Thanks for the quick shipping even during the Expo.” — Art Upton, K8XG

“The training feature of this rig for me can’t be beat. I now see in real time when my dits, dots and spaces are decipherable. I can see in real time when the spacing between my words make words legible. This rig even tells me my sending speed (wpm). I am completely happy with this feature as I am now able to truly work towards a more clean, disciplined, confident and fun CW experience.” — Gary Dingman, KG7CSD

  • Unparalleled Decoder Capability in Noisy Environments:  With its unique signal processing algorithms, the Morse Code decoder outperforms all others.
  • Type and Read in English:  Use the included QWERTY keyboard to type, while hearing outgoing and in incoming Morse Code, aiding in learning the code subconsciously.
  • (Optional) Learn Morse Code:  The included Morse Code Key-In capability with built-in decoder testing aids in learning the Code.
  • Automated Send/Receive Protocols:  Enter your call sign and other information for station setup.  Remote station call sign captures automatically.  All call and answer protocols are automatic – you only type your message.  Or change the protocol via built-in micro-program editor.
  • Set your maximum comfortable typing speed:  While the DMX-40 can send very fast, it’s best to limit speed so you don’t starve the transmitter.  A unique feature that maximizes the use of the type-ahead buffer in transmit mode calculates your comfortable typing speed automatically.
  • Super Power Micro-programming System:  Besides simple automating common text segments, the micro-programming system allows control over the transmitter, enabling many advanced features.  12 micro-programs up to 60 characters each.

Click Here for a Complete Features List

  • Advanced Direct Conversion SDR Receiver: with custom filter, balanced mixer, and low-noise preamp giving sensitivity 0.3µV, -118 dBm
  • GUI: 3.5″ color touchscreen LCD
  • Weight: 11 oz with protective lid
  • Size: 3.8″ x 5.2″ x (1.3″ w/o lid, 2.25″ w/lid)
  • Power Consumption, receive:  Approx. 1.4 watt, LCD backlight ON, approx. 0.96 watts with LCD backlight OFF.
  • Power Consumption, transmit (average, 50% keydown):  Approx. 3.4 watts at 12V input.  Rises to 4.8 watts at 16V input (16V MAX)
  • Power Output:  Approx. 3 Watts at 12V input, Approx. 4.5 Watts at 16V input (16V MAX)
  • Average Power, based on 25% transmit, LCD always on:  1.9 watts at 12V, 2.3 watts at 16V (16V MAX)
  • Receive Tuning Range: 4.9 MHz to 10.2 MHz.
  • Transmit Enabled Range: Extra Class: 7.0 MHz to 7.3 MHz,  General Class: 7.025-7.125 MHz and 7.175-7.3 MHz,   Technician Class: 7.025-7.125 MHz.


The DMX-40 Morse Code Decoder & Convertor Transceiver combines a state-of-the-art decoder, a color touchscreen graphical user interface (GUI), a Software-Defined Receiver (SDR) and a QRP (Low Power) transmitter, all powered off of a 12V power source, packed into a small, lightweight and very portable package.

The decoder uses innovative digital and analog signal processing circuitry and algorithms to overcome the typical noise found in most real band operating conditions.

GUI for countless features

The GUI includes a full menu system, and 28 unique graphic screens to accomplish an amazing set of features, some not found in transceivers at any price.

Automated functioning

Computer automation simplifies the process of calling and interacting with automated station ID’s and remote station call sign capture. The built-in automation can be user-modified using the powerful microprogramming language RPL (Rig Programming Language), with unique capabilities.

Operate on any band

Operating modes include normal transceiver mode and the unique External Mode, which allows operation with an external transceiver. Using this feature, operation an any band with the full decode and encode function, including automation, is possible.

Customer Reviews

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