Mini HS Dual-Duplex Hotspot Board with 2 Antennas, P25 DMR NXDN Support for Pistar

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 er 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

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 ( mit) 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-colour 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

Colour: As Shown

Material: PCB

Package Contents:

1 * Duplex digital spot board with antenna

Only the above package content, other products are