Forum: GNU Radio USRP & BasicTx max freq?

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657193d281ec594e38400a4459b35ad8?d=identicon&s=25 Ken Smith (kenhokie)
on 2009-01-21 20:19
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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