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[Discuss-gnuradio] USRP need antenna?

From: Suvda Myagmar
Subject: [Discuss-gnuradio] USRP need antenna?
Date: Fri, 15 Apr 2005 13:41:08 -0500
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.3) Gecko/20040922

From FAQ on Ettus website I understood that one doesn't need rf front-end to run basic experiments on USRP hardware. Is that correct assumption? I have usrp main board and RX, TX daughterboards. I thought this hw can tune into frequency spectrum up to 50 MHz, which means I can listen AM radio broadcasts without antenna.

Since I was having trouble running examples such as am_rcv.py provided in gnuradio-examples/python/usrp because of wx import issues (see separate thread on this issue), I changed the example so that I don't use wx module. I tuned into AM stations 1400, 1230 etc. I get the following message:

# ./my_am_rcv.py 580
RX d'board A: Basic Rx
RX d'board B: <none>
usrp_standard_rx::set_decim_rate: WARNING rates > 128 result in incorrect gain.
>>> gr_fir_ccc: using SSE
>>> gr_fir_fff: using SSE
Press Enter to quit:

According to this the basic HW I have doesn't seem to be able to handle AM radio broadcast frequencies.


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