[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Discuss-gnuradio] The correct way to receive pulses?

From: seph 004
Subject: Re: [Discuss-gnuradio] The correct way to receive pulses?
Date: Wed, 13 Jun 2007 02:57:06 -0700 (PDT)

--- Matt Ettus <address@hidden> wrote:

> seph 004 wrote:
> > My question is about the correct setup to receive
> > pulses. I've managed to get my system to transmit
> 1
> > second pulses at 16 ms intervals.
> >
> > I wanted to test how the usrp receives these
> pulses
> > again by routing the output of the basic TX board,
> to
> > the input of the basic RX board. This seems to
> work
> > for continuous wave signals, but when I try to
> route
> > my pulsed output back, the signal appearing on the
> > host pc appears to be saturated. I end up getting
> a
> > series of combs that don't seem to be related to
> the
> > incoming pulse in anyway.
> >
> > The pulses are centred at 40 kHz and have 2 kHz
> bw.
> > I've set the decimation rate to 250, and used the
> > set_freq method to tune to 40 kHz. I know I can
> > receive a 40 kHz wave as I have done so with a
> > modified version of usrp_siggen.
> >
> > Is there something Ive overlooked in terms of the
> > settings I've used?
> >   
> What daughterboard are you using?  Only the LFRX and
> LFTX go down to 40 kHz.
> Matt

Thanks for replying.

I'm using the basic RX daughterboard. I know it's not
supposed to be able to pass such low frequency
signals, but I have used it to successfully receive
signals as low as 40 kHz. Those were continuous waves
though. Now that I'm trying to view pulses centered at
40 kHz, I get the behavior I described previously.

I made a mistake in my first email. My transmitter is
outputting 1 millisecond pulses, not 1 second pulses.

Could the behavior I'm seeing be caused by the PRI I'm
using? I'm not sure what to try next.



Fussy? Opinionated? Impossible to please? Perfect.  Join Yahoo!'s user panel 
and lay it on us. http://surveylink.yahoo.com/gmrs/yahoo_panel_invite.asp?a=7 

reply via email to

[Prev in Thread] Current Thread [Next in Thread]