Hi John, I use one of the 26dB active timing antenna like ebay item 271266449940 or 170889540720 but a quick look shows fluke.l is selling a 38dB one 300956651110 that might be good if you have a long antenna run. You don't say what receiver(s) you have, but the Thunderbolt needs a gain antenna. It's always best to put the gain at the antenna. On the subject of feeders, while the systems are 50R impedance, it is common to use 75R cable TV or satellite coax. It's cheaper and lower loss at 1.5GHz than common 50R cable. The loss due to mismatch is less than the reduced line loss. Trimble rcommend this approach.
HTH, Robert G8RPI. ________________________________ From: David J Taylor <[email protected]> To: Discussion of precise time and frequency measurement <[email protected]> Sent: Sunday, 15 September 2013, 10:14 Subject: Re: [time-nuts] Req: Decent GPS Antenna Active/PassiveRecommendation Hello David, Thanks for the pic! Well, I need something that I can put outside, in the weather, with my verticals, and other antennas. I am a Ham radio enthusiast, and I want something I can properly mount and can be an all-weather device and can live happily 'in the farm' so to speak. I should have been more specific. Thanks Again, John Westmoreland AJ6BC - (that's my call sign) =================================================== Thanks for the clarification, John. I'm sure others will answer your question, but here I have not found the need for an outdoors GPS antenna, being located on the top floor of a two-storey building, in a good VHF location. This with one exception - an older Garmin GPS 18 LVC, which had the sensitivity of decade-old devices, not the modern chips. That just sits on the sloping roof, actually on the opposite side of the roof from these antennas: http://www.satsignal.eu/wxsat/atovs/pic_old-and-new.jpg from: http://www.satsignal.eu/wxsat/atovs/index.html 73, David GM8ARV -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: [email protected] _______________________________________________ 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.
