Help: about ./benchmark_rx.py

GNU Radio
1

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)
[email protected]

2

Li Mei-Wen wrote:

Mei-Wen Li (Emily)
[email protected]

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

3

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.

4

Tom
./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…
Hi,
It might not be related but, when reading from
http://www.ettus.com/faq#norf I found:
Q: With the BasicTX can I transmit basic FM and AM, without additional
hardware?
A: Yes, the BasicTX will put out about 1mW up to about 50 MHz. A simple
connectorized amplifier (ala MiniCircuits) will get you greater range.
You may also want to add some low-pass filtering.

Regards
/Mattias