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From: | Martin Braun |
Subject: | Re: [Discuss-gnuradio] Merge multiple complex streams |
Date: | Tue, 13 May 2014 10:13:45 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 |
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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