Bill-- The Thunderbolt wants a higher gain antenna than most standard GPS receivers. I tried standard Garmin active antennas, and while they worked (I have a good view of the sky), signal levels could be better.
Best match probably is something like the HP/Symmetricom 58532A antenna, which has gain > 30dB -- most "active" GPS antennas are in the 24 - 26 dB range. They're not cheap, but they'll do the job. If you have much distance to cover, feed line is of course important as well -- 9913, LMR 400, good quality RG6, something with low loss at 1.5 GHz. I'm using a 58532A feeding a Symmetricom 58535A active GPS splitter to run a Thunderbolt and a Datum Tymserve 2100. Feedline is 9913 to the splitter, and short LMR 195 SMA cables from there. (Yes you can find F to SMA adapters, on eBay, even though many will shudder at the concept...) 73 Bob K6RTM On Apr 2, 2012, at 15:01, time-nuts-requ...@febo.com wrote: > ------------------------------ > > Message: 4 > Date: Mon, 2 Apr 2012 17:39:40 -0400 > From: "Bill Riches" <bill.ric...@verizon.net> > To: "'Discussion of precise time and frequency measurement'" > <time-nuts@febo.com> > Subject: [time-nuts] Antenna for t-bolt > Message-ID: <01ac01cd1119$1c699af0$553cd0d0$@ric...@verizon.net> > Content-Type: text/plain; charset="US-ASCII" > > Hi guys, > > I have asked this question several times over the past few weeks and get no > answer. Have I been ostracized??!! > > Question is that I am looking for suggestions for GPS antenna for t-bolt. > The antenna that I am using now is a no name and I not know where it came > from! Wonder if a Garman GA-30 will work? > > 73, > > Bill, WA2DVU > Cape May, NJ _______________________________________________ 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.
