Forum: GNU Radio starting USRP basicRX pickup

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Ce0bf656556f498c6c6519702d65c774?d=identicon&s=25 Erik Tollerud (Guest)
on 2006-04-14 21:41
(Received via mailing list)
I can't seem to find a consistent answer to this - I'm trying to test
my USRP now that I have the software working correctly, but I can't
seem to find much anything in the FM or AM bands (usrp_wfm_rcv and/or
usrp_fft) using the antenna that I bought with the USRP (the "144MHz,
430 MHz, 1200 MHz Tri-band 6-inch vertical antenna" one), or just
various lengths of wire I tried hooking in.  It does seem to lock in a
bit around 100.1 MHz (although I don't think that's a radio station in
the vicinity), but there's no audio coming out the demod.  So should I
expect to be getting anything without any RF front end?  Oh, and I'm
in Tacoma, WA, so there are a number of fairly strong radio stations
745d8202ef5a58c1058d0e5395a78f9c?d=identicon&s=25 Eric Blossom (Guest)
on 2006-04-14 23:18
(Received via mailing list)
On Fri, Apr 14, 2006 at 12:39:45PM -0700, Erik Tollerud wrote:
> around...
With no gain or selection in the front end, it's pretty hard to see
anything.  However, if you use a 75cm piece of wire as an antenna,
there's a pretty good chance you'll be able to pick up broadcast FM
stations.   Note that because we sample at 64 MS/s, when using the
basic rx you can't distinguish 96MHz + N from 96MHz - N.

Try running and seeing what you see.
You'll probably have to turn the gain all the way up.

The "right answer" is to use one of the daughterboards that actually
contains a tuner.  E.g., TV RX, Flex 400, Flex 2400.

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