Back in Stock as of 10/23.

This is a Duplex Multiple Mode Digital Voice Modem in a Raspberry Pi Zero HAT form factor. While there are other versions of this type of Duplex board on the market this is the ONLY one which keeps the Pi Zero form factor that has become so popular. This will enable you to keep the portability of the MMDVM_HS_HAT while at the same time allows you to enjoy the benefits of a DUPLEX board. For DMR this means it can have QSO's happening on both time slots.

Note: The photos show the board with u.fl connectors installed.   These are a user installed option.   The pads are there but it is up to the customer to install these connectors. 
  Feature Upgrade :  All boards now have u.fl installed for free!  

Antennas: If you have bought this board in the past you can see the price with antennas included has gone up.   This is because my original supply of less expensive antennas has dried up.   I will be offering these more expensive antennas until I'm able to secure less expensive ones again.   At which time the original price will be resumed. 

Questions? :   Please follow the link in the DOCUMENTATION section.

Note:   This board was designed to be mated to a raspberry PI Zero.   It will work with ALL raspberry PI boards,  however there is a mechanical interference between the right hand SMA connector and the USB connectors on the PI.   There is an easy work around.   Put what is called a stacking header on the PI board first.   You can find one on Amazon HERE


MMDVM Duplex

Display Options
  • All the features of a duplex board without having to sacrifice the convenience of the Pi Zero form factor

International Shipments:
Due to COVID-19 , international shipments are seeing delays as they pass through customs.   Shipments that normally take 15 days can presently take as much as 10 weeks.  But this is the exception.   The average time appears to be around 4 weeks right now.    But please don't become discouraged if your shipment takes much longer.   

Thanks:  David