Technical Topics > SDR - Software Defined Radio
RX-888 Unboxing and mini-review
kris:
--- Quote from: 4nradio on October 23, 2020, 0007 UTC ---
My own RX-888 is showing fewer spurs and a lower noise floor when viewed in the same 32 MHz bandwidth with no attenuation in SDR-Console:
--- End quote ---
Hi 4nradio = It looks like you have no antenna connected> noise level below 120dBm and no HF signal. Check the cable!
You don't get any signal or your computer / program freezes.
Show what you have on a lower bandwidth, but you guess you've done it?
My PC i5 dual core, 8GB RAM, 2.5GHz clock can't handle receiving width above 8MHz.
With a width of 1 MHz, CPU usage is 15-20%
I was dissatisfied with the noise level of around 85 dBm in the 49m band. I thought it was the fault of the antenna and the environment. Today I just discovered that my 4.62A power supply has a noise floor of 10dBm more than the more powerful 6.7A power supply. In addition, the active speaker power supply adds about 3dBm of noise. Check your power supplies!
My PC exhibits strange behavior after disconnecting the AC adapter and switching to battery. The CPU load quickly increases to almost 48% and the noise level by at least 10dBm and the data stream processing is stuck.
Don't panic and wait, this state calms down after a while. The CPU load drops to normal, signal processing is back and the noise level is over 5dBm lower than it was on the power supply.
In this configuration, you can already understand quite poor signals.
4nradio:
Hi Kris,
I had no antenna connected to my RX-888 intentionally, as I was showing Chris Smolinski the different noise floor my receiver has, and the fewer spurs. This was for comparison to the similar screenshots he posted of his RX-888 without an antenna connected.
My RX-888 works great with a low CPU & GPU load, both on SDR-Console and HDSDR. If I run the receiver on the full 32 MHz bandwidth, CPU is around 25% as well as GPU. Normally I use 2 MHz bandwidth for medium wave coverage however (about 7% CPU in that situation). I am using a new 17-inch "gaming" laptop, Acer Nitro 5 series.
I'm very happy with it. I like the RX-888 so much I just bought and took delivery of another RX-888 for backup and other uses :D
73, Guy
Jari Finland:
Comparison test.
RX888 vs Perseus.
https://youtu.be/tC50LJg0CrM
I compared RX888 and Perseus in the same time with the same antenna. In night time listening the difference is not so clear. One can argue that RX888 is slightly behind in sensitivity. However, in morning during daytime listening RX888 cannot compete. In spite of in-built amplifier both the sensitivity and dynamics are lacking. Especially clear this is in the case of Utvarp Föröya 531 kHz.
alpard:
--- Quote from: Jari Finland on November 06, 2020, 1213 UTC ---Comparison test.
RX888 vs Perseus.
https://youtu.be/tC50LJg0CrM
I compared RX888 and Perseus in the same time with the same antenna. In night time listening the difference is not so clear. One can argue that RX888 is slightly behind in sensitivity. However, in morning during daytime listening RX888 cannot compete. In spite of in-built amplifier both the sensitivity and dynamics are lacking. Especially clear this is in the case of Utvarp Föröya 531 kHz.
--- End quote ---
But Utvarp Föröya 531 kHz. is very near from your location?
Only about a few hundred miles?
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