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

[Tom Miller]

Can you open them up and see how they are made and what they use for the 
gain device?

Take lots of pictures :)

----- Original Message ----- 
From: "Chuck Harris" <cfharris at erols.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Monday, July 30, 2012 4:07 PM
Subject: Re: [time-nuts] Active antennas for a Thunderbolt...


Hi Didier,

I don't quite know what to say about that.  Trimble seems to think that 
bullet
antenna is the right thing to use.  Somehow, I would think they should know.
It is possible that they are prone to failure, I guess...

It is surprising to me that the only antenna I can get to work is a Motorola
puck that is supposed to be too low gain (and is).

-Chuck Harris

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

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