Reid, John H wrote: > Message: 3 > Date: Wed, 14 Jan 2009 14:52:32 -0500 > > Hello Gents (and Ladies), > > I am in a bit of a quandary. I have been using a Synergy Timing 3000 > GPS antenna in a test set-up for some time and recently got a VIC-100 > antenna, thinking that its greater spec-sheet gain (38dBi vs 25dB(i?) > typical) would allow for a longer down-lead in the field if > needed. Upon testing, the VIC-100 appears to have around 10dB LESS > gain than the Timing 3000 and I would say is barely adequate on 25 ft > of LMR-195! I used a switched attenuator pad with 2 DC blocks for > the test and set each antenna to comparable SNR levels as indicated > using TAC32 with an M12M-T. I have tried a second VIC-100 with the > same results. Would anyone have an explanation for this? > > David, > > the VIC-100 is an amplified antenna, and needs DC continuity on the antenna > cable. > The Navtech description is "VIC-100 Active Antenna", 'active' in this case > being the giveaway. > > Regards, > John. > > > John
They are both (VIC100 (20mA typical) and Synergy timing 3000 (26mA typical)) active antennas requiring a +5V dc supply on the inner coax conductor. Bruce _______________________________________________ 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.
