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Dongle Direct Sampling Mode ?

Posted: Fri May 10, 2019 4:20 pm
by Robert11

Have a new Dongle from Amazon:

RTL2832U R820T2

Little bit confused over the freq. range that the Dongle I just bought is:

a. What's the upper end ?

b. I thought it was essentially 25 MHz and up, but I saw this note regarding it:

"Can tune from 500 kHz to 1.7 GHz and has up to 3.2 MHz of instantaneous bandwidth (2.4 MHz stable). (HF
reception below 24 MHz in direct sampling mode). Please note RTL-SDR dongles are RX only. "

c. So, how please do I use it in Direct Sampling Mode (using SDR#) ?
Not sure what to do in SDR# to invoke.


Re: Dongle Direct Sampling Mode ?

Posted: Fri May 10, 2019 7:27 pm
by bmh

Scroll down to where it says "Software Settings" and the instructions are there. Q branch is what you are looking for to listen to HF. You must switch back to Quadrature to listen to VHF/UHF again.

Re: Dongle Direct Sampling Mode ?

Posted: Sat May 11, 2019 4:46 am
by rtlsdrblog
More V3 specific instructions also available at

Please see the instructions card that comes with the dongle too, that should provide you will all the info links.