In a message dated 03/09/2009 02:05:20 GMT Daylight Time, brucekar...@aol.com writes:
I bought a 3.6-V Trimble Bullet GPS antenna on ePay and wish to use it with my T-bolt. Rather than try to internally modify the T-bolt to provide a 3.6-V antenna feed, I decided to try to build an in-line dropping adapter. I seriesed two Si diodes inside a 100 pf tubular ceramic capacitor and installed the shrink-wrapped assembly inside a salvaged BNC-M to BNC-F coaxial assembly. Unfortunately the completed assembly exhibits about a 4-to-1 VSWR when terminated in a 50 ohm load. Has anyone else tackled this challenge? The 3.6-V Trimble antenna has less gain than the 5-V version which makes my planned antenna rcable run on the edge even without the high VSWR.. ---------------------------- If you dont want to modify the T'bolt it would probably be easiest to derive 3.6v from the 5v supply external to the T'bolt and feed that into the antenna line with a blocking T. In the long run though it might be cheaper just to cut your losses and sell on the 3.6v version, buy a higher gain low cost 5v patch for now if you don't already have one, and keep an eye out for a 5v bullet if that's what you really want. regards Nigel GM8PZR _______________________________________________ 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.