There’s no built in bias tee for the RF ports on any USRP. 

For USRPs with GPS antenna inputs, those inputs have a 5V bias on them. 

Sent from my iPhone

> On Aug 28, 2023, at 7:46 AM, Steven Murdoch <ste...@lists.murdoch.is> wrote:
> 
> Hello,
> 
> Perhaps I’m missing something obvious but I haven’t been able to find an 
> explicit statement whether or not the USRP B205mini-i receiver has a bias-T 
> to supply power to an active antenna. Does anyone know whether it does, and 
> if so how to enable it and its specifications?
> 
> If it does not, does anyone have any recommendations for a good value bias-T, 
> ideally small and without needing a separate power supply (which would defeat 
> the convenience of a bus-powered device). 
> 
> This is for use with a L1 (1,575 MHz) active GPS antenna which needs 2.3–5.5V 
> 16.6mA. 
> 
> Thanks in advance!
> 
> Best wishes,
> Steven
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