MMDVM Duplex Hotspot Support DMR User Manual
- June 6, 2024
- MMDVM
Table of Contents
MMDVM Duplex Hotspot Support DMR
This guide just for the Products made by BI7JTA, Synchronous update www.youtube.com/winters-huang , www.bi7jta.org
Overview
Prepare
NOTE:
I have configuration your hotspot with default settings, if your purchase is
from BI7JTA provider, you do not need to flash SD card .
Hardware
MMDVM Duplex Hat with Antennas,
Raspberry Pi 3B, 4B, ZeroW,
SD Card/ TF card 8G/16G,
Nextion Display, OLED (Option)
Power supply 5V2A
Software
Pi-Star OS (Raspbian integration MMDVMHost, Serial of
DMR/YSF/P25/D-STAR/NXDN/POCSAG gateway serivces , Pi-Star Dashboard),
LAN IP devices address scan tools:
Fing , for iOS, Android, www.fing.com
IP Scan tools, for MAC OSX
https://apps.apple.com/cn/app/lanscan/id472226235?mt=12
Advanced_IP_Scanner , for Microsoft Windows http://www.advanced-ip-
scanner.com/
SDFormatter v4, for format your SD Card, just for install a new OS,
win32diskimager, just for install a new OS,
Web browser, Mobile default browser, Chrome, Firefox for Windows, Safari, Not
support Microsoft IE
Step 1 Hardware connection
Use 5V2A Power supply, any MicroUSB Android power supply wire, but must stable
, otherwise the power will affect your TX spectrum, cause high BER% .
Wire LAN recommend, the first time you use MMDVM hotspot.
Step 2 Network Configuration
There are 3 methods to make MMDVM hotspot connect to internet
1, Wire LAN (Simple and Recommend)
NOTE:
1, This method cannot use in your Raspberry Pi ZW, not have LAN interface,
Unless you buy a USB-LAN adapter.
2, If your hotspot with Raspberry Pi 3B/4B purchase from BI7JTA, one your
plug-in Wire LAN ,the display will show the true IP address.
Steps one by one:
– Connect the Wire LAN between Raspberry Pi 3B/4B and Router,
– The router assign IP address through DHCP ,
– Scan your MMDVM hotspot IP address,
See Figure: Windows OS find HS IP Address
– Open your the default web browser , visit the URL ,as follow
http://pi-star (If your LAN have more than 1 hotspot , this possible not link
to the hotspot you need) http://192.168.x.x (the IP address you have scan from
IP scan tools).
See Figure: Visit MMDVM Dashboard
– Add your home WiFi SSID/PSK, then reboot
– Finally
you can use WiFi connection, instead of Wire LAN.
- The IP address here just a demo value , please use your true scan result value.
2, WiFi self AP (Complicated)
View Appendix –> Configuration WiFi –> WiFi Self AP
3, WiFi config file (Need SD Card adpater)
View Appendix –> Configuration WiFi –> WiFi Config file
Step 3 Pi-Star Configuration
Base settings 
Frequency range: 144MHz-148MHz, 420MHz-475MHz,842MHz-950MHz
avoid the following ranges: 145.8-146.000 MHz and 435-438.000 MHz, otherwise
firmware will not start. See also
https://github.com/juribeparada/MMDVM_HS/releases/tag/v1.4.12
Display Type:
DMR Mode:
YSF Mode:
Step 4 Radio Programming
DMR Mode:
AnyTone 878UV,
Also apply to other model DMR radios, such TYT, Baofeng, Motorola, GD77 The
key items:
1, DMRID,
2, Talkgroup,
3, Receive Group CallList,
4, Color Code, Slot,
Motorola P8668i, XPR4550
YSF
YSF the BER around 1% is ok, you can also adjust by set RXOffset, TXOffset in Pi-Star expert mode.
Step 5 QSO & Testing
Troubleshooting
- Believe me , your board I have tested full, please do not doubt the board issue, need patience to make it work.
BER too high
Most Motorola radio, Hytera, Baofeng DMR radio ,will has big offset more than -300Hz
Cannot open repeater
Possible,
- RX, TX not invert with Hat and radio;
2, BER too high,
3, Other, such as frequency be interferences, Power supply not stable,
Cannot continue listen network TG, in DMR mode
– Duplex mode(Simplex Hat not support duplex mode)
Register BM account and setup your static Talkgroup for TS1,TS2
https://www.bi7jta.org/wiki/index.php?title=Main-Page#Set-Static-Talkgroups
– Simplex mode
Simplex mode default use Dynamic talkgroup, will continue listen the last TG
you have press PTT, on your DMR radio. YOu can also set more than one static
Talkgroup for TS2
Cannot connect to Modem
Possible reason:
-
satellite
Frequency restrictions to avoid satellite interference. Please avoid the following ranges: 145.8-146.0 MHz and 435-438 MHz, otherwise firmware will not start.
tail -100f /var/log/pi-star/MMDVM-2018-11-21.log
Error message Received a NAK to the SET_FREQ command from the modem
-
Factory Reset cause NextionDriver not normal
Ask me for help
Before ask me for help, please analysis Pi-Star running logs first,
http://pi-star/admin/download_modem_log.php
- Download Pi-Star full logs
- your radio channel settings detail screenshots
- Send to email bi7jta@gmail.com
Too large size video please upload to Youtube.com, then send me a link. Remote Desktop: Microsoft Teams, Teamviewer
Demo video
https://www.youtube.com/winters_huang
Reference
BI7JTA Wiki https://www.bi7jta.org
Pi-Star http://pistar.uk
MMDVM Project https://github.com/g4klx/MMDVM
Appendix
Frequency range:
144MHz-148MHz, 420MHz-475MHz,842MHz-950MHz
avoid the following ranges: 145.8-146.000 MHz and 435-438.000 MHz, otherwise
firmware will not start.
See also https://github.com/juribeparada/MMDVM_HS/releases/tag/v1.4.12
Other method for Configuration WiFi
WiFi self AP,
NOTE: This method cannot use in your NanoPi NEO, Raspberry Pi 2B not have
inner WiFi model.
Steps one by one:
– Power on your hotspot , after 2 or 3 minutes , if MMDVM hotspot cannot join
any WiFi netwok, Pi-Star OS will generate a WiFi AP(access
point/router),
– Open your iOS or Android , PC with WiFi adapter, join the Pi-Star WiFI AP,
– Open your the default web browser , visit the URL ,as follow (Must join this WiFi AP)
http://pi-star or
http://192.168.50.1 (the IP address is fix, if your display show this 50.1
address, means hotspot WiFi have not connect to internet). Figure: Visit
management page
– Add your home WiFi SSID/PSK, then reboot
– Use Fing APP or IP scan tools in Windows/OSX, find the Pi-Star hostname and DHCP IP
– Finally you have made the MMDVM hotspot connect to your router, do the next step
Known issue:
1, Some Android OS will reject join the WiFi network without internet
connection.
2, One you have reset factory settings ,re-flash SD card , MMDVM Hat Modem
connect failed, the Nextion Display or OLED will not show normal data
(connecting always), but do not worry , the WiFi AP will be made, ignore the
display data, Nextion/OLED display not a System Monitor.
WiFi config file
https://www.pistar.uk/wifi_builder.php
– Input your home WiFi SSID/PSK
– Submit to download, the file wpa_supplicant.conf
– Copy this file to the root of Pi-Star SD card
– Power on again ,if all correct , your MMDVM hotspot will connect to your
WiFi router
(Continue and not the end ) Write by bi7jta@gmail.com www.bi7jta.org 2020.12.24
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