Re: [Discuss-gnuradio] Re ceiving DBPSK side not working.

[ish13]

Ok I had used the muliplier in a previous code using Frequency Modulation
which is why I used it again.  But thanks for that.  I will change it to a
smaller value.  

I also had it set up with the interpolation to 512 and the decimation to 256
but it didn't work either.  Though I will set these values to the range it
has to fall between.

As for the transmitter, I had connected the output of the modulation block
to a scope to see if it was transmitting the correct waveform, which it was. 
Though the problem came when I try to receive.  When I tune into the
frequency I am transmitting at there is no signal at all, which I am not
sure why that is happening.  

Ismael


Tom Rondeau wrote:
> 
> On Tue, Apr 19, 2011 at 2:03 PM, ish13 <address@hidden> wrote:
> 
>>
>> I am using DBPSK, but I am not receiving anything when I transmit my
>> signal.
>> I attached the flow-graphs from the companion.  Can someone look through
>> it
>> and tell me if it is correct?
>>
>> Thanks
>> Ismael
>>
>> http://old.nabble.com/file/p31434999/Receiver.png Receiver.png
>> http://old.nabble.com/file/p31434999/Transmitter.png Transmitter.png
>>
> 
> A few issues. First, don't set the multiplier to 32k as you will probably
> start to over drive the amplifier. I tend to keep this at a max of 15k.
> 
> More importantly, though, you're interpolation and decimations are set to
> 4k
> and 2k, respectively. You cannot use this large of a number. The max (if I
> recall) are 512 for interp and 256 for decim.
> 
> It's also helpful to start the transmitter and use the usrp_fft.py program
> to make sure you are receiving what you think you are receiving.
> 
> Tom
> 
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> 
> 

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