Hi
Sry I dont know it. So which Bandwidth does a (Generic) USB SDR Dongle need?
When I use an Software who connects directly to the Dongle (like ADSB, ACARSdeco2) does the need more or less USB Bandwidth then when I use SDR# to "see" the Spectrum?
Dongle bandwidth you want as big as possible, so you can see a wide band in the spectrum.
Demodulator bandwidth is done in the PC while processing, for SSB ideal is about 2.5KHz.
[Edit]
Oh wait… USB is not a modulation type in this case
So look at sample frequency and you will have your answer (hint: it's not that much for a typical dongle)
I sayed in the other Tread I will buy an USB -> Fiber -> USB Adapter and need to know how much oft them I need. I use ~6 Dongle at the moment. My small Pc run with 100% CPU Load and my Business Server with 6% or so.
So the best think is buy an USB to Fiber adapter and Install an Virtual Win7 and run the Processing on my Server who run 24/7 in quite idle and save Power.
For that I need to calculate how much of that Adapter I have to buy.
The maximum sample rate of an RTL-SDR dongle is 2.5MS/s so that is 2.5MB. USB 2.0 specs say 60MB/s but even if you take half of that it's still theoretically enough for 10+ dongles.
perfect I will wait until the company replay to my E-Mail.
The maximum sample rate of an RTL-SDR dongle is 2.5MS/s so that is 2.5MB. USB 2.0 specs say 60MB/s but even if you take half of that it's still theoretically enough for 10+ dongles.
Shouldn't that be doubled? 2 ADC's for I/Q stream. So something like 40Mbps
The maximum sample rate of an RTL-SDR dongle is 2.5MS/s so that is 2.5MB. USB 2.0 specs say 60MB/s but even if you take half of that it's still theoretically enough for 10+ dongles.
Shouldn't that be doubled? 2 ADC's for I/Q stream. So something like 40Mbps
You are quoting what I said about the RTL-SDR but then mentioning the sample rate of the HackRF? What I could find about the last is that they mention 20MSps but it does not say if this is total or for I and Q each. If it is each then it can be 40MBps (not Mbps!), I agree. On the other hand they also say transfer rate 20MSps so... ?
Anyway, the USB speed will still be enough.
[Edit]
Did a bit more searching and found the following here:
https://www.rtl-sdr.com/review-airspy-vs-sdrplay-rsp-vs-hackrf/We monitored the USB usage using Windows performance monitor and discovered that the Airspy (with bit packing at 10 MHz) used 30,000,000 bytes per second, the RSP (at 8 MHz) 25,000,000 bytes per second and the HackRF (at 20 MHz) 40,000,000 bytes per second.So yes you are right, it is 40MBps.