[time-nuts] Antenna Supply voltage

[Neville Michie]

I have just scanned through the Thunderbolt manual and found no information 
on the supply of power to the antenna.
Is there a standard for the supply of power to the antenna?
Are there 3.3v , 5v and 12v antennae?
Will any antenna work safely on any GPS receiver?
It is just a question that I had never thought of before.
Cheers,
Neville Michie