MMDVM Modems for MTR2000 & MASTR III

MTR2000 Version

KS-DMR and WA0EDA are not affiliated with Repeater Builder.

Purchasing a Modem

We created the original station-specific plug-in modems for the Motorola MTR2000 and GE/Harris MASTR III. Today there are over 100 units in active service.

For inquiries or to purchase, contact Cort Buffington, N0MJS directly at n0mjs@me.com

  • STM32-DVM-MTR2K…………………………………………………………………….$175.00
    For the MTR2000. Includes GPIO, wildcard, and serial port I/O communications with the NanoPi NEO. Price includes a custom made ethernet extension cable/bracket assembly and USPS Priority Mail shipping in the US.
  • STM32-DVM-MASTR3…………………………………………………………………..$175.00
    For the GE/Harris MASTR III. Price includes a handsome custom 3D printed front panel to match the factory MASTR III modules and USPS Priority Mail shipping in the US.


Manuals, Articles & Tutorials

MASTR III Version


Much of the circuitry of the STM32-DVM-MTR2K and SMT32-DVM-MASTR3 is the same. Both use the same filters, the same modem processors, NanoPI NEO single board computer, etc. Most of the information contained here is applicable to both.

Manuals:

Articles & Tutorials:


Schematics and PCB Layouts

STM32-DVM-MASTR3 V1.0a

STM32-DVM-MTR2K V2.0


Firmware Updates

Binary Modem Firmware Files For Both Boards
(Instructions for updating are in the manual)

Binary Firmware Files for the STM32-DVM-MTR2K I/O Processor
(Instructions for updating are in the manual)

  • ATMEGA328P – 20200404 release with startup light show


CAD/CAM Files for DIY

The artwork is licensed under the Creative Commons BY-NC-SA 4.0 share-alike license. Which means you may do anything non-commercially you like with it, but you must provide attribution, even if you modify it. Which means you can pretty much do whatever you like, but you have to give credit to the Regents of the K0USY Group, and we prefer you just use the EDA logo.


Older Versions and File Archives