On 12.05.2014 17:49, Imre Biacsics wrote:
Playing around with GRC for a few months now, sorry if this question is
from a dummy.
I've a bunch of rtl dongles laying around, and wonder if it's possible to
combine more then one to a single baseband signal.
The goal is to create a super cheap full HF band web reciever like or for
' websdr'
I managed to create multiple channels, where the 2nd dongle is tuned to an
offset, equal to the samplerate of the first. (for example 2 x 2 Msps = 4
Msps baseband)
Is such a thing possible with GRC?
A couple of things, on top of what Mike said:
- HF bands go lower than the frequency of the dongles. Keep that in mind.
- As Mike said, clocks aren't sync'd. So, if you're using data from
multiple dongles, that'll most likely be corrupt.
- To make things worse, they drift differently too. So, little chance in
fixing things.
- If all you want is an (inaccurate) "spectrum analyzer" for more than 2
MHz, then this is actually not a bad idea. If you have N+1 dongles, you
can use N of them to monitor N*2MHz of spectrum, and the other one to
receive at frequencies you're interested in.
M
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