); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] I actually did just that on one of the HP 8 port splitters that was on eBay a few months ago. It was configured for external DC but simply passed the input voltage through untouched. A 78L05 regulator on a piece of perfboard mounted fairly easily inside the case and allows me to drive the splitter from my 13.8 volt bus.
John ---- Rob Kimberley wrote: > ); 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. > > _______________________________________________ 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.
