[time-nuts] Active antennas for a Thunderbolt...

[Azelio Boriani]

My network analyzer test for the GPS antennae is approximate, of course,
but nonetheless you can find out if the antenna is defective. Better to
have a known good antenna handy to compare, when using this setup. I'm
planning to build a frame (to hold the emitting antenna and the DUT) to
find out if this test can give reliable results.

On Tue, Jul 31, 2012 at 2:29 AM, Didier Juges <shalimr9 at gmail.com> wrote:

> HP58532A
>
> The manual is on my web site
> Www. KO4BB.com/Manuals
>
> The Bullet antenna specs are also on my site.
>
> Didier
>
>
> Didier
>
> Steve <steve65 at suddenlink.net> wrote:
>
> >Didier,
> >
> >What is the model number of the Symmetricom antenna? Do you happen to
> >know the difference in gain between it and the Trimble Bullet antenna?
> >
> >Steve K8JQ
> >
> >On 7/30/2012 2:46 PM, Didier Juges wrote:
> >> Chuck,
> >>
> >> I have one of the original red box TB.  It came with the Trimble
> >Bullet antenna that is specified in the TB datasheet.
> >>
> >> The antenna works but gives extremely poor results.  The TB works
> >much better with the Symmetricom antenna that is sometimes available on
> >eBay.
> >>
> >> The Bullet antenna is usable with other GPS receivers,  so I know it
> >is not bad.  Its just a poor match for the TB.
> >>
> >> Didier KO4BB
> >>
> >>
> >> Chuck Harris <cfharris at erols.com> wrote:
> >>
> >>> Ok, I'm getting a little puzzled.  I have a TB that came from one of
> >>> the early groups sold by John Ackermann and TVB as part of the TAPR
> >>> buy.
> >>> It works nicely, but like all TB's, it is deaf as a post, and needs
> >a
> >>> high gain antenna.... When I first got the TB, I tried it with a
> >>> Motorola
> >>> hockey puck antenna, with about 17db gain, and if it is outside in
> >the
> >>> clear, it works nicely... but LH shows the satellites signals are
> >all
> >>> down in the mud.
> >>>
> >>> ...So...
> >>>
> >>> I bought the active antenna that the TB data sheet said belonged
> >with
> >>> the TB, a 24045-10 bullet antenna, and *NO* satellites are visible..
> >>> the antenna is dead.
> >>>
> >>> I'm no stranger to getting cheated on things I buy, so I chalked it
> >up
> >>> to bad luck, and put my Motorola hockey puck antenna back on my TB.
> >>>
> >>> ...Then....
> >>>
> >>> A couple of days ago another active antenna became available, a
> >>> Micro Pulse 1934NW/C 50db antenna from a DATUM INC GPSDO.  I checked
> >>> its data sheet, and it powers off of +5V @ 38ma, so I bought it,
> >>> hooked it up to my TB, and again *NO* satellites are visible... the
> >>> antenna is dead.
> >>>
> >>> I put a "T" in the line, and the voltage heading up to the antenna
> >is
> >>> around +4.5V... The spec sheet says it will work down to +3V.
> >>>
> >>> Am I doing something wrong here?  Or am I just unlucky?
> >>>
> >>> -Chuck Harris
> >>>
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> >
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> brevity.
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