[Discuss-gnuradio] how to control the flowgraph run and wait?

[Dong Li]

Hi,

I am tring to write some python script to implement the synchronous
transmit. So I have to control the two flowgraph to decide what is the
proper time to start, and also need some method to wait (for instance,
first send a header then wait some time to send the packet). Is there
some module or method to do this? Any suggestion is welcome.

Dong Li


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[Discuss-gnuradio] a problem about antenna

[Dong Li]

Hi,

I tried to use my gnuradio catch some radio signals in the air with
the script ./gnuradio-examples/python/usrp/usrp_wfm_rcv.py, but all we
heard is just some noise in FM frequency band(about 90MHz~110MHz), so
we guess maybe need an antenna to get a stronger radio signal.
our USRP has two daughter boards: basicTX and basicRX. And we mailed
to Matt Ettus, here is letter and his reply (say sorry to Matt Ettus
for publishing this letter):

---from here-

We've got 3 USRP packages ( also 3 basic RX-daughter boards and 3
basic TX-daughter boards). However, it comes without antenna in the
box. We want to know that if we are required to buy antenna from you
if we want to perform experiments between those USRP devices? If yes,
which mode is suitable for us? Thank you.


Antennas are not included in the purchase.  You will need to get your
own.  We do not sell antennas which match the frequency range fo the
basic rx and basic tx, so you will need to purchase those elsewhere.

Thanks,
Matt Ettus
--to here-

We've checked the interface of USRP, its SMA Female, and nearly all
the antenna's interface for wireless which are sold in Fry's
Electronics is SMA Reverse Plug. So I guess a adapter from SMA Male to
SMA Reverse Jack will connector the USRP's RF end to an antenna.
Is anyone has any idea of the antenna, or where we could get such
adapter or some
link of website where we could buy antenna suitable for BasixRx/Tx
daughter board?

Thank all for any help,

Dong


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[Discuss-gnuradio] a question about configuration

[Dong Li]

Hi All,

I am new in GNU Radio, when I configure the modules of GNU Radio, I
found four of them can't pass the configuration checks:
gr-audio-jack
gr-audio-osx
gr-audio-portaudio
gr-audio-windows

The other modules of GNU Radio are OK, I build them under FC6. I have
no idea about what are the four modules used for, does it means that I
can't use my sound card correctly? And, my task with GNU Radio is
probably on cooperative communication, is it OK for me to work without
these two modules?

Thanks a lot,

Dong Li


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