Starting USRP basicRX pickup


#1

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
around…


#2

On Fri, Apr 14, 2006 at 12:39:45PM -0700, Erik T. 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 usrp_fft.py 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.

Eric