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[Discuss-gnuradio] USRP & BasicTx max freq?
From: |
Ken Smith |
Subject: |
[Discuss-gnuradio] USRP & BasicTx max freq? |
Date: |
Wed, 21 Jan 2009 20:19:42 +0100 |
I am a newbie to the radio. I am trying to find my way around and have
gone thru some of the examples.
I am trying to transmit (for right now) 2 tones from the BasicTx
daughterboard. My goal is to have a centerfreq of 150MHz. Basically I
have a test program that is modified from the
/usrp/host/apps/test_usrp_standard_tx.cc file.
I am not looking to run with Python, but C++, so that is why I started
here. I am reading the 2 tone data from file and putting it into a
buffer. I output the data after opening the USRP with the call:
ret = utx->write (buf, sizeof (buf), &underrun);
I have 2 tones offset from a center frequency, which is set with the
call:
utx->set_tx_freq (0, center_freq);
I have it working and verified with a SpecAnalyzer for up to 44.0 MHz.
If I get over that, it barks at me for having to high of a center
frequency.
I thought the BasicTx was good up to 250MHz?
I can trace thru the "driver" code in usrp_standard_tx.cc and see that
there is a check for that 44.0 MHz limit.
Is this a Tx limit? and the Rx limit is 250MHz? Or am I missing
something?
Thanks,
ken
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