Article 28283 of sci.geo.satellite-nav:
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From: davem@cs.ubc.ca (Dave Martindale)
Newsgroups: sci.geo.satellite-nav
Subject: Re: Trimble 26dB gain active antenna
Date: 22 Nov 1996 11:11:42 -0800
Organization: Computer Science, University of B.C., Vancouver, B.C., Canada
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Message-ID: <574tte$8og@harpo.cs.ubc.ca>
References: <327F7D7B.304B@cae.ca> <32935b77.9471312@nntpserver> <570lhu$lh5@lana.zippo.com> <3294da6f.20143754@nntpserver>
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david.bagby@amd.com writes:
>Well, I should have thought of that - I guess I assumed that the hand
>held would not be powering garmin antennas since their antennas all
>appear to be passive - but I just turned on the 45Xl and checked with
>my DVM - yep, +5v at the center of the antenna connector.  Cool. I
>think I'll order a Trimble Bullet antenna and get 35db of preamp boost
>for $75 from my local marine electronics house - sounds lots better
>than $130 for the Garmin passive antenna!

You seem to have a bunch of misinformation.

The Garmin remote patch antenna (GA26) is not passive - it's an active
antenna and needs that +5 V.  It can also be bought for about $90 from
James Associates.  And it draws half the current of the Trimble
"miniature OEM" antenna, which might be significant for battery-powered
use.

On the other hand, the Trimble "miniature OEM" antenna is smaller than
the Garmin and has a longer cable and is somewhat cheaper.  And it has
interference filters of some sort.  Definitely a good choice too.

The Trimble Bullet antenna is yet another antenna.  It is intended for
mounting on a pole on a roof, or on a boat, and appears to be considerably
larger than either the Garmin or Trimble patch antennas listed above.

	Dave