RX888 ADC SDR Receiver




RX888 ADC SDR Receiver

Receptor de radio 1.8GHz 16bit Muestreo directo HF UHF VHF HDSDR

El RX-888 se basa en el chip ADC de 16 bits LTC2208 que es capaz de transmitir todo el rango de frecuencia de 1 kHz a 32 MHz a la PC a través de USB 3.0 con muestreo directo. Las frecuencias de 32 MHz a 1,8 GHz también se pueden recibir a través de un sintonizador R820T2 que se encuentra en la placa (el mismo sintonizador que se usa en la mayoría de RTL-SDR).

Debido a las restricciones de ancho de banda del R820T2, el ancho de banda por encima de 32 MHz está restringido a 8-10 MHz. El principal cambio en comparación con el RX-666 parece ser que hay un LNA que mejora el rendimiento de la antena de onda media y pequeña, lo cual fue un problema en el RX-666. El RX-888 también agrega varios disipadores de calor al gabinete, ya que la generación excesiva de calor del LTC2208 ADC también parece ser un problema.

Descarga software RX-888 


RX-888 A Sub $200 16-Bit 32 MHz Bandwidth SDR

Rx888 direct sampling 16bit SDR receiver, HF direct sampling, maximum 32m real-time bandwidth, VHF / UHF support to 1.8GHz, maximum real-time bandwidth 8m, USB3.0 connected to computer.

Never burn computers. Unlike some semi-finished products, computers are easy to burn. This is very important. Through the optimization of proprietary software and firmware, the requirements of computer performance have been greatly reduced.

The PCB is redesigned, and the clock and PLL are shielded by shield. The spectrum is clean and there is no lo interference. If you look at the spectrum of the last picture, you can see whether there is stray interference at a glance.

All adopt LDO power supply, 7 LDO power supply, linear power supply, eliminate the interference of DCDC.

It adopts KDS VCXO crystal oscillator with large vacuum and potentiometer to fine tune frequency offset. It is not a cheap ordinary crystal to do clock.

Adding 20dB differential low noise amplifier LNA in the front end of ADC can effectively improve the medium wave sensitivity and the receiving performance under the small size antenna.

The bandwidth of the readjusted HF LPF low-pass filter is adjusted to 64M, which is prepared for the subsequent upgrade software to support larger bandwidth.

Software extio.dll Redesign, excellent UI and rich settings, support HF and VHF / UHF antenna bias power supply Bias-T switch, HF three gear 0dB, – 10dB, – 20dB attenuation ATT, and VHF LNA and VGA settings, support global bandwidth settings.

Hdsdr is perfectly supported. At present, it has been adapted to SDR ා and can support most SDR software in theory. More SDR software adaptation in the future

Currently known problems:

1. Because the ADC chip ltc2208 is very hot at high sampling rate, although it has been guided to the shell by thermal conductive silica gel pad, and the shell is also attached with heat sink. But the shell is still very hot after a long time of work, but after a long time of running test, the stability is OK. Passive heat dissipation is limited by radiator size

2. Due to the low completion of the open source project bbrf103 itself, we have made major adjustments in both hardware and software. As of June 8, our extio.dll It can run perfectly on hdsdr, and can work well on SDR. There are still some bugs to be improved. Other SDR software will be adapted.

3. Since the VHF uses the r820t2 tuning chip, the maximum bandwidth will be limited to 8m, and it may be increased to 10m later, that is to say, only short wave can have real-time 32m bandwidth.

4. It is necessary for the computer to have USB3.0 interface, and the computer performance should be better, otherwise the maximum bandwidth will be stuck.

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