DIY project, not support  unconditional returns, please make sure you have enough patience to use this set of open source development kit, have question you can contact bi7jta@gmail.com ,I will use Remote desktop: Teamviewer, Microsoft Teams, help you make it work, if necessary.

User‘s Manual 

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

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

Features:

Support MMDVM mode DMR/YSF/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 MHz ,  435~438.000 MHz
High-quality ECS TCXO, stable with low BER.
Support Raspberry Pi 3B, 3B+, Pi ZERO, 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' 

Click to view big image

With Nextion/TJC screen

 
With Raspberry Pi 3B

AlloyCaseAllComplete-RPi_3B & AlloyCaseAllComplete-RPi_4B2G

Vertical SMA interface and antenna (Must remark this reqiurement when your check out)

Wiki for Setting guide

https://www.bi7jta.org/wiki/