The MMDVM Project is the brain-child of Jonathan G4KLX. The project is coordinated on the MMDVM Yahoo! Group. MMDVM is an open-source Multi-Mode Digital Voice Modem software application to allow for the development of homebrew hotspots. The source code for the MMDVM firmware supports
It runs on the Arduino Due, the ST-Micro STM32F407-DISCO and STM32F446-NUCLEO,
as well as the Teensy 3.1/3.2/3.5/3.6. What these platforms have in common is
the use of an ARM Cortex-M3 or M4 processor with a clock speed greater than 70 MHz,
and access to at least one analogue to digital converter and one digital to analogue
converter. A Cortex-M7 processor is prefered.
A must watch Video by Jonathan Naylor the author of MMDVM that was published 5th June 2017
A Video about the construction of the MMDVM Zumspot Libre Kit which is based upon the "Blue Pill" STM32 controller and assembled upon an adapter board.
The Brandmeister wifi has a homebrew MMDVM page that details tested radio transceivers:
The source code is available on github:
github.com/g4klx/MMDVM - MMDVM source code on github.com (github)
Detailed instruction from "F5UII – French Hamradio Station" on howto build the MMDVM hotspot on various ARM architectures.
www.f5uii.net/en/hotspot-homebrew-zumspot-mmdvm-pistar-tune - Build your own homebrew MMDVM hotspot
And this site gives a list of the available MMDVM compatible shields:
wiki.brandmeister.network/index.php/Homebrew/MMDVM - MMDMV Shields
How To Make A MMDVM Digital Repeater by San Antonio Digital Radio:
Here is a comparison of various hotspots:
The Zumspot was an early hardware project of the MMDVM hotspot and most development
appears to be done in and Canada and distributed by Bruce Given, VE2GZI.
However, the Chinese clones are cheap (under $100 Australian) and have become very popular,
dispite their lack of ongoing support. I guess they are almost a throw away item.
A popular Chinese clone of the Zumspot is called the Jumbospot and is available on many Ebay sites.
It has been often criticised as being unreliable but my unit has worked without fault.
See for details on the Jumbpspot: JumboSpot
This post appeared on the MMDVM blog site http://mmdvm.blogspot.com/:
TUESDAY, APRIL 17, 2018 I no longer sell anyEquipment/MMDVM Zumspot products this includes the Zumspot pi board, kits and the MMDVM-Pi please check www.zumspot.com for more information Please dont email me for any more information , As I will simply not reply So long and thanks for all the fish! Posted by VE2GZI and Company at 2:07 PMThat leaves us with the clone market.