[Discuss-gnuradio] USRP Tx channel

[Krzysztof Kamieniecki]

On the http://comsec.com/wiki?RfSections4USRP page, I read the following 

<quote>
The useful output frequency range is about 1 MHz to 55 MHz ( +/- 55 MHz with a
hole from -1 to +1 MHz if you use complex sampling)
</quote>

This may have been discussed before but I could not find it in the archives.

Could someone (probably Matt Ettus) give me more detail about the output of
frequencies below 1MHz? 
Is there a transformer/filter at the output, or is it a DAC limitation?

If the issue is insurmountable I can mix the DAC output down, but I would prefer
to have one less analog component.

Thanks,
Krys