(Updated DEC-5 re. loss of connection after PC reboot)
I became aware of the RX666, a Chinese build of Oscar Steila’s BBRF103 design.
Basically, a design with a 16-bit ADC capable of sampling 32 MHz, and with a R820T2
chip “thrown in” to allow reception up to 1800 MHz. I did a write-up which you
can read here. The antenna connectors were not up to
standard, so after a while I returned it for a refund.
is very much the same design, but with a smaller PCB and apparently better
build quality. Unlike the RX666, the RX888 has an LNA built-in for better
As a MW
DX-er I’m mostly interested in how it performs on MW. And for that, three
things matter more: Sensitivity, large dynamic range, and a minimum of 1200 kHz
alias-free sampling. And of course, software to match.
footprint is quite a bit smaller than the RX666. It measures 72 x 83 x 43 mm (excluding
antenna connectors) and weighs in at 160 grams – less than half that of the
RX666. Heat dissipation panels make up three sides and of course adds to the
ADC (Analog Devices LTC2208 in this case) is always better than 14-bit or
12-bit ADCs, especially when negotiating the huge signal levels on the MW band. In that respect, the RX888 performs very well indeed, even if the only filter is a 64 MHz low pass filter. The
downside, as with the RX666 is sensitivity. Although the RX888 has an LNA
built-in, sensitivity figures are still in the lower part of the list, 3-4 dB
better than the RX666. I measured -95, -98 and -99 dBm on 500, 1000 and 1500
kHz (AM mode, 6 kHz bandwidth, a 400 Hz signal with 30 % modulation). This is
5-6 dB worse than the Perseus, and 10-12 dB worse than the Airspy HF+. The good
part though, is that the ADC is quite forgiving if you decide to use external
amplification. A 16-dB preamp from DX-Engineering increased sensitivity by 13-14
dB, which is a massive improvement. I did test this setup on a very
signal level MW band, fed from a beverage antenna, and noted no overloading. If
you do, you can always reduce RF gain by 10 or 20 dB.
sample rates when using the dlls developed for HDSDR are 2, 4, 8, 16 and 32 MHz.
In addition, there is support for 64 MHz sampling rate. SDR Console also
supports the RX666 and RX888 and offers a 1-MHz sampling rate in addition.
require a USB 3.0 port on the PC, and of course the wider sampling rates, the
more it demands from your PC. Since the Cypress driver was already installed
for the RX666, the RX888 connected right away.
Alas, to my disappointment both the RX666 and RX888 suffer from a serious flaw: After a PC reboot, the devices will not restart. You need to disconnect and reconnect the USB cable for the PC to recognize the devices. This may not matter too much if you always sit in front of the PC. If you want to control the PC via remote control, my only advice is: Don't restart the PC.
the Perseus + Jaguar combo is still my choice for MW DX-ing, the RX888 appears
to perform very well if some external gain is added.
are in the USD 230-250 range, not much more than the SDRPlay RSPdx but a lot
more resilient to large signal levels and only slightly less sensitive. And not very much more than the Airspy HF+/Discovery, but able to sample the entire MW band.