Upgrades of for One R9: MAX2837 is replaced by MAX2839. Si5351C is replaced by Si5351A with additional clock distribution. A series diode is added to the antenna port power supply. One Description: One is a peripheral capable of transmission or reception of radio signals from 1 MHz to 6 GHz. Designed to enable test and development of modern and next generation radio technologies, One is an open source hardware platform that can be used as a USB peripheral or programmed for stand-alone operation. Attention: 1. the latest firmware is supported, and the current firmware is firmware v1.7.0 by default. 2. for certain functionality, like the world map, GPS simulator, and others, you need to prepare a PortaPack H2 and a FAT32 formatted Micro-SD card over 1G. for One Specifications: 1 MHz to 6 GHz operating frequency Half-duplex transceiver Up to 20 million samples per second 8-bit quadrature samples (8-bit I and 8-bit Q) For Radio, SDR#, and the like Software-configurable RX and TX gain and baseband filter Software-controlled antenna port power (50 mA at 3.3 V) SMA female antenna connector SMA female clock input and output for synchronization Convenient buttons for programming Internal pin headers for expansion Hi-Speed USB 2.0 USB-powered Open source hardware for MHz to 6 GHz SDR platform development board Note: Portapack H2 is not included. Material: Metal+Plastic colour: black Package Contents: 2 x 20DB 50MHz-6GHz LNA 2 x SMA male-male cable 2 x USB cable 2 x 5DBi 40MHz-860MHz antenna 2 x TCXO module 2 x 8DBi 2.4G/5/5.8GHz antenna 2 x 40MHz-6GHz telescopic antenna 2 x 12DBi 700MHz-2700MHz antenna 2 x 35DBi 700MHz-2700MHz antenna 2 x for One + shell 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.