[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?
> 
http://files.ettus.com/uhd_docs/manual/html/dboards.html#basic-tx-and-lftx

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

-josh

> BR/ Per
> 
> _______________________________________________ USRP-users mailing
> list USRP-users at lists.ettus.com 
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
> 




More information about the USRP-users mailing list