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
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:
- STM32-DVM-MASTR3 Version 1.0a
- STM32-DVM-MTR2K Version 2.0c
- STM32-DVM MTR2K Version 2.0 I/O API Addendum
Articles & Tutorials:
- STM32-DVM-MASTR3 and an External Analog Controller
- Build Your Own STM32-DVM-MTR2K
- Configuring Pi-Star for the STM32-DVM-MTR2K
- STM32-DVM-MTR2K: V2 Host I/O Communication Firmware Update
- STM32-DVM-MTR2K: The Story Behind it, and the Future
- Coming Soon: STM32-DVM-MTR2K V2.0
- Configuring MMDVM for the MTR2000 and STM32-DVM-MTR2K
- STM32-DVM-MTR2K: Deep Dive – Updating Firmware
- MTR2000 and STM32-DVM-MTR2K: Analog + Digital, Playing Nice Together
- Programming an MTR2000 for the STM32-DVM-MTR2K
- Introducing the STM32-DVM-MTR2K
Schematics and PCB Layouts
STM32-DVM-MASTR3 V1.0a
STM32-DVM-MTR2K V2.0
- Schematic diagram V2.0a/b
- Printed circuit board diagram V2.0a/b
- Schematic diagram V2.0c
- Printed circuit board diagram V2.0c
Firmware Updates
Binary Modem Firmware Files For Both Boards
(Instructions for updating are in the manual)
- STM32F446RET6 – STM32-DVM-MTR2K V1.0, V2.0a, V2b, (some) V2.0c
- STM32F405RGT6 – STM32-DVM-MTR2K V2.0c, STM32-DVM-MASTR3
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.
- Eagle Schematic/PCB Files
- Gerber and Excellon Drill Files
- SMD Assembly Files for JLCPCB/LCSC (maybe others)
- STL file (zipped) for Ethernet extension mounting bracket
- STL file (zipped) for Nextion 3.2″ display (clips to the front grill, no holes required).
Older Versions and File Archives
- STM32-DVM-MTR2K Manual – V1c and V2a)
- STM32-DVM-MTR2K V1c schematic diagram
- STM32-DVM-MTR2K V1c printed circuit board diagram
- STM-32-DVM-MTR2K V1c-a Schematic diagram
- STM-32-DVM-MTR2K V1c-a Schematic diagram (update)
- STM32-DVM-MTR2K V1c-a Printed circuit board diagram
- ATMEGA328P – 20200105 release with host I/O communication
- ATMEGA328P – First release version I/O Processor used in v2
