[USRP-users] Transfer function Basic TX board ?

Josh Blum josh at ettus.com
Wed Sep 19 12:51:57 EDT 2012

On 09/19/2012 09:42 AM, Per Zetterberg wrote:
> Hi,
> We are looking at the Basic TX with USRP N210. When we generate a
> sinusoid the amplitude is -22.72dBm at 250kHz, -12.78dBm at 1MHZ and
> -8.63dBm@ 10MHz (the amplitude was 16000 in digital base-band (
> unsigned short), UHD driver and a small program). This is perfectly
> fine with regards to the specification of the Basic TX board.
> We then removed the components on the board and measured directly on
> the DAC output. The characteristic was still the same. We had
> suspected the transformer created the high-pass characteristic.
> Could somebody please explain why we get this result? Is there some
> high-pass filtering going on on the FPGA?

The Basic TX has a high pass filter. Its sibling, the LF TX does not,
and covers DC to ~33 MHz.


> BR/ Per
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