[Top][All Lists]

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

Re: [Discuss-gnuradio] Suse10.1 walkthrough and a question concerning cr

From: Mark Sullivan
Subject: Re: [Discuss-gnuradio] Suse10.1 walkthrough and a question concerning crosstalk
Date: Mon, 25 Sep 2006 11:50:51 -0400


As an additional experiment I hacked multi_file.py in the multi-antenna folder so that the multiplexor was set to channel 0 for all four "I" inputs; with a carrier injected into channel 1, I saw identical leakage. I then changed the mux setting to channel 1 for all "I" and saw the injected carrier. This isn't sounding like software.

Best regards,

Mark Sullivan

On 9/22/06, Eric Blossom <address@hidden> wrote:
On Fri, Sep 22, 2006 at 05:38:54PM -0400, Mark Sullivan wrote:
> When I inject a signal at a -45 dBm level on the "RX-B" sma connector on a
> Basic RX daughtercard, I see a copy of the signal on the "RX-A" side when I
> use usrp_fft.py. The level is 10-20 dB below that of what I see if I move
> the signal from "RX-B" to "RX-A," but this seems like too much coupling.
> Using a 50 ohm termination on the unconnected sma connector helps a little
> bit. I see no copy of the signal from either input of the other Basic RX
> daughtercard. Any thoghts, anyone?
> Best regards,
> Mark Sullivan

Hi Mark,

There's a chance that the code that determines the rx digital mux
setting isn't handling this case properly.

Assuming that the Basic Rx is on the "A" side, please try this:

  $ usrp_fft.py -R a:0 -f <freq>

and try moving the test signal from RX-A to RX-B

and this:

  $ usrp-fft.py -R a:1 -f <freq>

and move the test signal from RX-A to RX-B

What happens?


reply via email to

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