); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] My first thought here would be to use a small 3 pin 5V regulator to drop the DC down, and then capacitively couple in and out to let the RF through.
Interesting to see what other comments you get. Rob K -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jason Rabel Sent: 27 July 2007 20:12 To: 'Discussion of precise time and frequency measurement' Subject: [time-nuts] Building a DC Block Thingy.... ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] om 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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
