UHF VHF UV for mmdvm Hotspot Module for DMR P25 YSF DSTAR Pi 3B 3B with OL

<p><strong>Description:</strong><br>Our simplex and duplex systems all use an offset of 0, which is our duplex system. Regardless of simplex or duplex, the offset is 0.<br>We are using high-precision temperature compensated crystals, so it is 0<br>We use high cost TCXO crystal with extremely low bit error rate, offset of 0,<br>and frequency error of 0<br> <br>new pi4b need remove R1 Resistor.<br>STM32_for MMDVM_HS HAT Rev1.7 Guide<br><br>1.Hardware add (SDA,SCL)R20,R21 Connect stm32 i2c 2 bus to OLED,and raspi. oled message pwr on without RPI using for mmdvm_hs custom fw,and i2c 2 bus.<br>2.Support i2c communication with raspi<br>Setting For Pi-star software and for raspberry hardware (rpi 0-3) new pi4b need remove R1 Resistor.<br>Controller Mode: Simplex Node<br>Radio Frequency: Freq:144-148,219-225,(Main Band)420-475,842-950<br>Example:438.000000<br>Radio/Modem Type:STM32-DVM(GPIO)<br>14.7456 TCXO with RXOFFSET=0 TXOFFSET=0<br><br>Quick start:<br>1.download image https://www.pistar.uk/downloads/ write it to card<br>2.insert card to rpi<br>3.wait to boot 5 minutes connect wifi Pi-star-setup pass for raspberry<br>4.open http://pi-star/admin/<br>5.set freq,dmr id,dmr mode,add home's wifi ssid...<br>Default Username: pi-star<br>Default Password: for raspberry<br><br>to support i2c communication change for MMDVM_HS code(by Andy Uribe CA6JAU)-&gt;Config.h<br><br>// Host communication selection:<br>//#define STM32_USART1_HOST<br>//#define STM32_USB_HOST<br>#define STM32_I2C_HOST<br>to disable i2c 2 to raspi and oled just remove R20,R21<br>update new FW: (pi-star / expert / ssh access / user :pi-star pass:raspberry)<br>sudo pistar-for mmdvmhshatflash hs_hat<br>ps:update new FW no oled pwr on message.<br>mode info pls visit<br><br>The for MMDVM hotspot support module can work with UHF or VHF(VHF is not the main band)<br> <br><strong>Specification:</strong><br>· High performance 32-bit AR M processor<br>· Fully assembled and tested<br>· Supports DMR, P-25, D-Star and System Fusion<br>· Onboard LEDs to show status (Tx, Rx, PTT, Mode)<br>· Up to 10mW RF power<br>· SMA antenna connector, UHF&amp;VHF antenna included<br>· Mounts cleanly on all current Raspberry Pi's including the Pi <br>· The firmware is pre-loaded and is easily upgraded via software.<br>·UHF 433 900 MHZ, VHF 144 220 MHZ Opera FREQ<br>· Supported and tested with PI-STAR<br>Please note: The product does not come with a memory card or motherboard. You need to start it to connect to the hotspot, insert the memory card, and then connect to the hotspot to light up the screen.<br><br><strong>Packing list:</strong><br>1*Single hotspot expansion board<br>1*OLED screen<br>1*shell<br>1*Antenna<br> <br>Please do not upgrade the firmware by yourself, if you have not the knowledge for it.<br>The product needs to be soldered with the pi motherboard (not included), please make sure you know it before buying.</p><p><br></p><p><br></p><p>Note:<br>1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.<br>2. Please allow slight manual measurement deviation for the data.</p>