Hi The DC isolation part should be pretty simple. There are off the shelf RF transformers that are rated for the frequencies you are looking at. Weather they are rated for 250 volts or not I don't know. MA-Com is one source:
http://www.macomtech.com/Transformers?partNum=&searchType=Contains&filter=20 %7C343&page=1&pageSize=20&sortType=PartNumber&sortFieldID=0&sortOrder=asc&ca tID=25 Alternately winding your own is pretty easy, there's not much to them. Bob -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Yuri Ostry Sent: Wednesday, June 16, 2010 5:10 PM To: time-nuts@febo.com Subject: [time-nuts] Galvanic decoupling of GPS antenna Hello, I'm trying to put gps (for a coarse timing sync and RTC auto-setting) to a small controller that must be completely galvanically decoupled from outside world. Antenna power must be supplied from separate power source (ground potential of isolated part of circuit can slowly float up to +/- 250 volts referenced to ground of antenna power supply). First thinked about using some choke to inject power, then DC-blocking capacitor around 20-30 pf and then smt 1:1 wideband transformer, but looks like Mini-Circuits don't make standard models for frequencies over 1200 MHz, their search engine give me some part numbers that looks like special order ones, and cannot be found in their catalog. Is there any chances to get decent performance if I'll simply split stripline (both ground and signal traces) by dc-blocking caps? Idea looks not very good to me, of course, I suspect that i'll get all sorts of interference right to GPS LNA input... Maybe there is some well proven solution with easily obtainable parts? -- Sincerely, Yuri mailto:y...@ostry.ru _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
