Page 1 of 1

A lower frequency SDR?

Posted: Sat Oct 19, 2013 4:04 am
by Bee Seventeen Bawmer
Hello,

I am looking to receive lower frequency ranges in the area of 10 kHz plus or minus one or two, up to 15 MHz. (10kHz-15MHz

Is there any dongle out there now that can process this range?


I am very curious about these awesome little SDR dongles!

Re: A lower frequency SDR?

Posted: Sat Oct 19, 2013 11:42 am
by erikonkulis
use upconverter

Re: A lower frequency SDR?

Posted: Sat Oct 19, 2013 3:48 pm
by soooooil
Yes, upconverter would be the only (relatively cheap) choice here. But I doubt you'll be able to receive as low as 10 kHz, most upconverters work from few MHz and up. I believe the reason for this is that dongles AGC acts like crazy around LO frequency and you see only spurs. Theoretically it can be solved with a good bandstop filter but even then I doubt that 10 kHz is achievable.

Re: A lower frequency SDR?

Posted: Thu Oct 24, 2013 4:31 pm
by Bee Seventeen Bawmer
I have looked into the FunCube Dongle plus and they guarantee down to 150 kHz...

I am more focused on receiving the lower frequencies in the 10kHz-150kHz range, does anyone have any ideas on how to do this?

Is there a "lowconverter"?

Re: A lower frequency SDR?

Posted: Thu Oct 24, 2013 5:57 pm
by soooooil
Well, yes, it's called upconverter :)
It does exactly what you want — shifts the lower frequency in the range where your sdr can receive.
The lower limit is slightly higher than DC only because of not ideal components. And there is not much you can do about it.

Re: A lower frequency SDR?

Posted: Thu Nov 14, 2013 12:58 am
by symp
You don't need an SDR, just use your soundcard, a basic modern soundcard should get you from 0hz to 96khz just do some googling

Re: A lower frequency SDR?

Posted: Wed Dec 09, 2015 12:55 pm
by Tim Bucknall
a dxer I know is using Yosoo in direct sampling mode for these frequencies
http://skywavesdx.org/viewtopic.php?f=31&t=1982