[time-nuts] Req: Decent GPS Antenna Active/PassiveRecommendation

[Robert Atkinson]

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 <david-taylor at blueyonder.co.uk>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
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: david-taylor at blueyonder.co.uk 

_______________________________________________
time-nuts mailing list -- time-nuts at febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.