RE: [Discuss-gnuradio] Help: about ./benchmark_rx.py

[Li Mei-Wen]

> Sorry, but your question is not very clear. It's a wireless modem, which
> means it's subject to all sorts of issues that are dependent on your
> setup and parameters.
>
> The best thing to do is to start simple and use usrp_fft.py to see if
> you can observe any signal at the receiver and that the signal has a
> good SNR. If you have the qtgui package installed with GNU Radio, you
> can also try to use benchmark_qt_rx.py which will show you the received
> signal and the baseband symbols (so you can look at the constellation).
>
> Tom

Dear Tom
I can observe signal when I use usrp_fft.py.
But, How to know the SNR is good SNR?
When I use TVRX the signal very was clear, but the BasicTX was not.
 
In fact, I can use two RFX900 daughterborads to do the  ./benchmark_tx.py -f 900M and  ./benchmark_rx.py -f 900M.
I think that's becasue they have same frequency range (750 to 1050 MHz).
But, if I use the BasicTX and TVRX to do ./benchmark_tx.py -f 100M and  ./benchmark_rx.py -f 100M, I can't run if.
Because they have different freqency range?
TVRX daughterborad is 50 MHz to 860 MHz Receiver
BasicTX daughterborad is 1 MHz to 250 MHz Transmitter
 
Or because antenna ?
I buy the BasicTX, but not  include antenna, so I use RFS900's antenna instead it.
The result was TVRX can receive FM channel, But BasicTX can't send signal..

Thanks in advance.
 
 
> Date: Mon, 18 Jan 2010 09:03:04 -0500
> From: address@hidden
> To: address@hidden
> CC: address@hidden
> Subject: Re: [Discuss-gnuradio] Help: about ./benchmark_rx.py
>
> Li Mei-Wen wrote:
> > Hi:
> >
> > I want to try my daughterborad basic_TX and TV_RX.
> > I try to use ./benchmark_tx.py -f 100M and ./benchmark_rx.py -f 100M
> > Only the ./benchmark_tx.py can run, The ./benchmark_rx.py can't
> > receive any signal.
> > So, what's wrong about this? How can I do?
> >
> > Thanks in advance.
> >
> >
> > *Mei-Wen Li (Emily)
> > address@hidden
> >
>

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