RX waveform is not what I expected

GNU Radio
1

I have RFX400 daughter boards on both TX and RX side and set them on
450MHz.

TX details are below:
grc file http://dl.dropbox.com/u/11382666/02_RXTX/TX.grc /
imagehttp://dl.dropbox.com/u/11382666/02_RXTX/TX.grc.png/ scope
plot http://dl.dropbox.com/u/11382666/02_RXTX/ScopePlotTX.png

RX details are below:
grc file http://dl.dropbox.com/u/11382666/02_RXTX/RX.grc /
imagehttp://dl.dropbox.com/u/11382666/02_RXTX/RX.grc.png/ scope
plot http://dl.dropbox.com/u/11382666/02_RXTX/ScopePlotRX.png

As you can see, the scope plot on RX side is not what I expected, I
wanted
rectangular waveform like TX side
and this weird waveform is a part of LONG sinusoidal wave

how can I fix it to get a fine waveform?

2

On Tue, Jan 4, 2011 at 12:27 AM, Songsong G. [email protected]
wrote:

I have RFX400 daughter boards on both TX and RX sideand set them on 450MHz.
TX details are below:
grc file / image / scope plot
RX details are below:
grc file / image / scope plot
As you can see, the scope plot on RX side is not what I expected, I wanted
rectangular waveform like TX side
and this weird waveform is a part of LONG sinusoidal wave
how can I fix it to get a fine waveform?

Looks like you suffer from a frequency offset problem. Try finding
the magnitude or power of the signal, and you’ll get something more
similar to the transmitted waveform.

–
Seokseong Jeon (aka Songsong G.)

Brian