[time-nuts] Building a DC Block Thingy....

Björn Gabrielsson bg at lysator.liu.se
Fri Jul 27 15:31:35 EDT 2007

Whats the problem disconnecting your antenna from the antenna port on the
Splitter, connect your NTS-200, and then measure the DC-voltage on the
Splitter antenna port?

Maybe you _want_ to build a DC-block... ;-)



On Fri, July 27, 2007 21:11, Jason Rabel said:
> ); SAEximRunCond expanded to false
> Errors-To: time-nuts-bounces+bg=lysator.liu.se+bg=lysator.liu.se at febo.com
> I have a NTS-200 on the way, but one thing about them is their GPS power
> output is 12V instead of the usual 5V. I really didn't want to modify the
> board any in an irreversible fashion so I was hoping to build an inline
> coupler that I could block / sink the 12V current.
> I have a Symmetricom SmartSplitter, and I know that *should* do the job as
> long as a lower numbered port is supplying power, but I really don't want
> to
> take the accidental risk of sending 12V to my antenna.
> Doing the math to sink 25ma of current would require a 480 ohm resistor...
> That should make the receiver happy and think all is well. But that's as
> far
> as my knowledge goes. What size capacitor would I need to use? Do I need
> to
> add an inductor in series with the resistor?
> Jason
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