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

[Jason Rabel]

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