[Discuss-gnuradio] USRP 2 Daughter Cards

[jim graham]

I am trying to use the USRP 2 radio.  I have been using the
rx_streaming_sample script to collect data.

 

If I use the rfx1800 daughtercard the results from the set_center_freq
command seem correct but the output

looks as if the receive channel is not connected (changing gain does not
affect output levels).

 

If I try the lfrx or dbs daughter cards the set_center_freq response appears
incorrect.

The baseband frequency is 0 and the ddc frequency is the negative of the
commanded frequency.

 

Any suggestions?

 

==

Jim Graham

Black River Systems Company, Inc.

162 Genesee Street, Utica, NY 13502

   e-mail : gra...@brsc.com

   voice  : (315) 732-7385 x146

   fax : (315) 732-5837

==

 

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RE: [Discuss-gnuradio] USRP 2 Daughter Cards

[jim graham]

Eric,

rx_daughterboard_id() returns id 0x0034 for the RFX 1800 daughtercard?


For the comment on the RFX boards; does this mean we are unable to use the
dbs daughtercard on the USRP 2 unit?

-- thanks
jim

==
Jim Graham
Black River Systems Company, Inc.
162 Genesee Street, Utica, NY 13502
   e-mail : gra...@brsc.com
   voice  : (315) 732-7385 x146
   fax : (315) 732-5837
==

-Original Message-
From: 'Eric Blossom' [mailto:e...@comsec.com] 
Sent: Thursday, February 19, 2009 2:24 PM
To: jim graham
Cc: discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] USRP 2 Daughter Cards

On Thu, Feb 19, 2009 at 01:21:37PM -0500, jim graham wrote:
 Eric
 
 We are using Fedora Linux version 7 on an x86 machine.

OK.

[Please be sure to hit Reply-All to reply to the writer and the list.]

 The GNU radio software is Revision 10211 (jcorgan) 
 Last change date 1/12/2009
 
 We have the USRP 2 connected to a directional antenna.  I have used the 
 dbs daughtercard hooked to the same antenna with a USRP 1 to verify 
 a signal is present.
 
 For the dbs and lfrx daughtercards are the set_center_freq outputs of 0
for 
 Baseband freq and -commanded freq for ddc freq correct?  
 The output of the call using a flex1800 daughtercard is different.

What rx_daughterboard_id() does the USRP2 report for your RFX 1800?

With regard to RFX boards, the USRP2 only supports the MIMO_B version.
Any board that the firmware doesn't recognize is treated as a Basic Rx
or Basic Tx.

Eric



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