Duplex version MMDVM_HS_Hat This PCB uses MMDVM_HS. It integrates two ADF7021 chips and supports dual-slot duplex operation in DMR mode. The default bit error rate is less than 5% and the default frequency deviation is 0. If the bit error rate is higher than 5%, it can be corrected by adjusting the frequency deviation as long as the signal can be received. Fully tested. Supports DMR, P-25, D-Star and System Fusion (Fusion) protocols. Onboard LED indicators show status (Tx, Rx, PTT button, Mode). output power up to 10mW. SMA antenna interface, antenna included<br><br>Mounts neatly on all current models of for (for ), including Pi Zero Firmware is preloaded and can be easily updated via software Frequency range: UHF: 430-450 MHz, 433 MHz and 900 MHz VHF: 144 MHz, 220 MHz operating frequencies Architecture The top SMA interface is the TX (transmit) port. The bottom SMA interface is the RX (receive) antenna port. Support UHF + VHF bands SMA antenna interface (antenna included) Modem selection: STM32_HS_GPIO Core advantages Supports dual timing of UHF and VHF bands Signals can be sent and received simultaneously in full-duplex mode Supports mobile power supply, worry-free outdoor operation Flagship technical 2U+2V antenna interface (a total of 4 SMA ports) to zero signal interference Dual-screen compatible design Adaptable to 0.96-inch OLED screen and LCD screen Dual-color indicator light displays the working status in real time Application scenarios Applicable to: DMR/C4FM/D-STAR and other digital intercom systems Mobile emergency communication base station -band repeater station integration solution Color: As Shown Material: PCB<br><br>Package Contents: 1 * Duplex digital hotspot board with antenna<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.