RX-888 MKII SDR Radio

Description:

The RX-888 MKII is the new generation of the RX888, featuring several key improvements and enhancements for superior performance:

• 1. Added a tunable attenuator in the HF path, adjustable from 0 to -31.5dB.
• 2. Updated the fixed LNA to a Variable Gain Amplifier (VGA), offering a range of -10dB to +33dB applicable to both HF and VHF.
• 3. Incorporated the advanced tuner chip R828D, replacing the R820T2.
• 4. Enhanced 64M Low Pass Filter (LPF) to improve image rejection.
• 5. Switchable reference clock via jumper: internal or external 27MHz.

The primary goal is to provide users with finer control over the RF front-end and a wide dynamic range, accommodating both strong and weak signal reception. The tunable range spans from -41.5dB to +33dB for HF and 0dB to 55dB for VHF, meeting most usage scenarios.

In collaboration with IK1XPV, the original author of BBRF103, we've developed a universal driver supporting both RX888 and RX-888 MKII. We anticipate that open-source collaboration will greatly enhance software support and extend the RX888's lifespan.

Open-Source Firmware: https://github.com/ik1xpv/ExtIO_sddc

Technical Specifications:

• 1. LTC2208 16-bit ADC at 130 MSPS
• 2. Dual RF input, HF range: 1kHz-64MHz, max real-time bandwidth 64M. VHF range: 64M-1700MHz, max real-time bandwidth 10M.
• 3. 0.5ppm VCXO
• 4. ATT adjustment range: -32dB to 0dB
• 5. VGA adjustment range: -11dB to +34dB
• 6. Supports external 27MHz reference clock
• 7. 3.3v software switched Bias-Tee for HF/VHF independent control
• 8. ADC PGA and Dither software control
• 9. Compatible with mainstream SDR software such as HDSDR, SDRConsole, SDR#

Package Included:

• 1 x SDR Radio