Re ceiving DBPSK side not working

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

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On Tue, Apr 19, 2011 at 2:03 PM, ish13 [email protected] wrote:

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

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 R. wrote:

Thanks
4k
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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

Tom R. wrote:

256
sure why that is happening.
received signal?

Thanks
More importantly, though, you’re interpolation and decimations are set

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On Thu, Apr 21, 2011 at 2:14 PM, ish13 [email protected] wrote:

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

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 R. wrote:

Gain=20.
also a really old version of GRC.

Ok I had used the muliplier in a previous code using Frequency
range
not

through

(if

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On Tue, Apr 19, 2011 at 2:35 PM, ish13 [email protected] wrote:

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

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