Final 12 in stock ! Limitied quantity due to pandemic.
7/21/21

The Microcontroller ( STM32F103C8T6 ) is not available anywhere at this time. Once the remaining duplex stock is gone, there will be no more duplex boards until this microcontroller becomes available again. When this will be only GOD himself knows.

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: Two short stubby antennas come with each board. I also have longer antennas with about 2dB of gain available on the accessories portion of my site. If you want your board to be supplied with the long antennas, just order the no antenna option for the board and then add the long antennas as a seperate item. You will need to order 2.

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 right here under Accessories.

Additional INFO can be found on the right hand side by expanding that section by clicking on the + symbol.

MMDVM Duplex

Name: MMDVM Duplex
SKU: 201803002

$99.00

Antenna OPTIONS

Display Options

Quantity

All the features of a duplex board without having to sacrifice the convenience of the Pi Zero form factor
All products are garunteed for 6 months from the date shipped.
I'm very lenient on returns. If you have an issue please contact me and I will do my best to resolve your issue by Email. If after a few exchanges the problem is still not resolved I will ask you to return the board to me where I will either repair the board or replace it. If you feel your board is DOA then you must contact me within 14 days. I will still ask you to return it but if I verify it is DOA I will replace it with a new one. ( As long as I have an inventory on hand )

There is one condition:
Once you have soldered on the board I reserve the right to possibly not replace the board instead I will only repair a board which has been soldered. Therefore I recomend verifying it is in good working order before adding an OLED or Nextion screen.
All boards are guaranteed to perform and be free of defects both cosmetic and electrical for a period of 6 months. ( my opinion of cosmetic may differ from yours ) If there is a problem within this period, contact me and we'll first try to resolve it through Email. If we're unable to I will ask you to return the board where I will either repair it or replace it.

The warranty remains in effect for 6 months unless there has been electrical or mechanical modification made to the board. This includes the addition of an OLED screen or Nextion Screen. Even then you still have a warranty, however the replacement option goes away. I will still repair it if possible. If it is not repairable this is the risk you assume when you make a modification.

The reason for this is simple. If for example an OLED screen has been added and then removed when the board is returned, I cannot repair and refurbish to a LIKE NEW state. Reminents of solder will remain on those pads. I cannot resell that board as a new one.

LONESTAR SEMICONDUCTOR DESIGNS LLC

MMDVM Duplex

PRODUCT INFO

RETURN & REFUND POLICY

DOCUMENTATION

WARRANTY

International Shipments: