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Re: [Discuss-gnuradio] 250MHz signal generation using Basic TX

From: Josh Blum
Subject: Re: [Discuss-gnuradio] 250MHz signal generation using Basic TX
Date: Mon, 29 Mar 2010 21:08:31 -0700
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100217 Shredder/3.0.3pre

On 03/29/2010 08:11 PM, S'dir wrote:


I have an USRP Rev-4.5 board, which contains two daughter boards, Basic TX
and BasicRX. According to the TX and RX Daughterboards data sheet, the TX
daughter board is capable of generating  up to 1 MHz to 250 MHz signal.

I am unable to generate transmit signal more than 44MHz using the
usrp_siggen.py program which comes with the Gnu Radio software development
kit to generate the Transmit signal.

The DAC rate is 128 Msps. Technically, you cannot have frequencies above the nyquist rate of 64 MHz. The basic tx relies on aliasing to get anything above that rate. Take a look on a spectrum analyzer when transmitting, you should see the signal and its aliases. -Josh

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