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Re: [Discuss-gnuradio] LFRX problems

From: Martin Dvh
Subject: Re: [Discuss-gnuradio] LFRX problems
Date: Fri, 05 May 2006 01:03:06 +0200
User-agent: Debian Thunderbird 1.0.2 (X11/20051002)

Brett L Trotter wrote:
> I've been attempting to get my LFRX daughterboard working on a USRP
> board. Most of the gnuradio-examples I've tried don't work on the LFRX
> (they worked on basic rx). For instance, some of them come up and the
> graph displays are not moving until I drop the gain to 0-3. Some lock up
> and are not adjustable.
> Is there something obvious I'm missing?
The LFRX is a true DC - 30 Mhz board.
DC means you either have to apply the corrent DC-bias to your input


AC-couple your inputs by using capacitors.

For my experiments with capturing analog baseband video with LFRX I used 
ac-coupling for both ground and signal line.
(using several uFarad capacitors, to create a frequency response from 10 Hz to 
30 MHz)

If you DC-connect the ground from LFRX to real ground without adding a dc-bias 
directly you will probably get nothing out of it.


> Is there a good frequency I should be able to pick up with am_rcv.py and
> a 20ft piece of wire?
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