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

[ish13]

No I am using TVRX to receive and basic TX to transmit.  I have changed the
following values,
Receive.
Decimation=256
gain = 20

Transmitter.
Interpolation= 512
Multiply Const=5000

I am now receiving my audio file and saving the data into another file. 
Though the data is not the just the file data because the play back of the
song it has a lot of noise.

But sorry I have version 3.3.  

Ismael


Tom Rondeau wrote:
> 
> On Thu, Apr 21, 2011 at 2:14 PM, ish13 <address@hidden> wrote:
> 
>>
>> Am going to work on it today and see if I get any results from the
>> previous
>> replys. Below the setting that are currently being used but I am changing
>> the interpolation and decimation rates.
>>
>> 4k.
>> Gain=20.
>> Freq= 100.1MHz
>> Board is tvrx
>> Version 3.3 gnuradio and 0.7 grc
>>
>> Ismael
> 
> 
> 
> You are trying to transmit using a TVRX? That's a receive-only board.
> That's
> also a really old version of GRC.
> 
> Tom
> 
> 
> 
>> Tom Rondeau wrote:
>> >
>> > On Tue, Apr 19, 2011 at 2:35 PM, ish13 <address@hidden> wrote:
>> >
>> >>
>> >> 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
>> >
>> >
>> > Just connecting to the scope inside the transmitter isn't likely to
>> tell
>> > you
>> > too much. You want to see it at the receiver. The fact that you are not
>> > seeing it at the receiver helps.
>> >
>> > What interpolation are you using at the transmitter when looking for
>> the
>> > received signal?
>> > What gain settings?
>> > What frequency?
>> > What daughterboards are you using?
>> > What version of GNU Radio and GRC?
>> >
>> > Tom
>> >
>> >
>> >
>> >> 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
>> >> >
>> >> > _______________________________________________
>> >> > Discuss-gnuradio mailing list
>> >> > address@hidden
>> >> > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>> >> >
>> >> >
>> >>
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>> >>
>> >>
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