Re: [Discuss-gnuradio] Transmit and Received Signals are Different

[Ben Hilburn]

You said you replaced the channel model block with a USRP sink and source?  Are you trying to TX / RX using a loopback?  If so, remember to use attenuators so that you don't blow out your RX chain.

Also, the channel model block cannot simply be replaced with a source and sink.  There is a lot of other stuff going on in there - look into the documentation for the block, as you will need to make other adjustments so that your samples come out as you expect.

Cheers,

Ben

On Thu, Jul 26, 2012 at 11:56 AM, Frederick Lee <address@hidden> wrote:

So I've been trying some more simulations, and I found that the DPSK
demod and mod blocks allowed me to maintain the signal. Even if I
applied a small offset to the data through the channel model block,
the signal on the scope stayed the way it should. The flow graph is
shown in the channel_model_w_DPSK.png picture.

When I tried this with the USRPs, the only change I made was replacing
the channel model block with a USRP sink and a source. However, when I
run these two flow graphs, nothing shows up on the fft sink or the
scope sink. Does anyone know why this is?

Thanks,

Frederick

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