Out of stock note:

Because of the STM32 chip too expensive now , Duplex Hat Temporary Out Of Stock now . Please consider the MMDVM repeater product

https://www.bi7jta.org/cart/index.php?route=product/product&product_id=52

User‘s Manual

PDF Download https://www.bi7jta.org/files/UserManuals/

Youtube Page https://www.youtube.com/wintershuang

Features:

Support digital mode DMR YSF|C4FM P25 NXDN DSTAR POCSAG
Double timeslot in DMR mode, act as a mini Digital voice repeater.
Support VHF/UFH, frequency range: 144MHz-148MHz, 420MHz-475MHz,842MHz-950MHz, Avoid satellite frequency: 145.8~146.0 MHz , 435~438.000 MHz
High-quality ECS TCXO, stable with low BER.
Support Raspberry Pi 3B, 3B+, 3A, 4B, Pi ZERO(W), Compatible with NanoPi NEO, Orange Pi, Compatible to BlueDV(Required to add USBtoTTL or Bluetooth model)

Including & components
1x PCB with complete soldering,
2x ANTs 5CM length,
1x 4PINs header connect to Nextion LCD

The default antenna is black color with 5CM length, the silver Alloy Case use white color antenna. If you need other lengths, please leave me a message.

Options:
See the components for detail.

PAYMENT : Paypal offline

SHIPPING: https://www.bi7jta.org/cart/index.php?route=product/product&product_id=51

Specs and Docs:
MCU: STM32F103C8T6
Transceiver IC: ADF7021,Programmable output power: -16dBm to +13dBm
TCXO: ECS 14.7456MHz,±2.5 ppm
HAT: 1.6mm thick, unleaded process

https://www.st.com/en/microcontrollers/stm32f103c8.html
http://www.analog.com/media/en/technical-documentation/data-sheets/ADF7021.pdf
http://wiki.friendlyarm.com/wiki/index.php/NanoPi_NEO

After sales and support:
BI7JTA@gmail.com Facebook Twitter IM

Product show:

With OLED 0.96' and 1.3'