[time-nuts] Source for Trimble Bullet GPS antennas?

Bob Camp lists at cq.nu
Thu Dec 17 00:16:24 UTC 2009


Hi

The Lucent Bullet is rated as a 26 +/-3 db LNA device.

The Trimble Bullet is rated as 30 +/-3 db at 3.3 volts ( for the III model)

The Trimble Bullet II is rated as 35 db at 5 volts

A lot of the simple antennas are up around 45 db at 3.3 volts. 

The less specified parameter is noise figure. The Bullet II has a 2.75 db nf, the III at 3.3 db. I haven't seen a number on the Lucent part. 

These days a 1.5 db noise figure is not all that expensive at GPS frequencies. 

I suspect that none of that really helps straighten out any of this ....

Bob



On Dec 16, 2009, at 9:50 AM, Didier Juges wrote:

> My Trimble Bullet antenna seems less sensitive than any other GPS antenna I have (a Symmetricom, a good-looking Trimble mag-mount and several cheap active antennas). I receive fewer sats with the Bullet, at any time that I have tried.
> 
> Maybe it is defective, or maybe that's the way it is.
> 
> I bought the Symmetricon HP 58532A new on eBay for a very reasonable price (forgot how much, but I think it was $45 or so). I would recommend it over the Bullet, it looks better made too (more metal).
> 
> Didier KO4BB
> 
> 
> 
> 
> On Wed, Dec 16, 2009 at 1:54 AM, Robert Atkinson wrote:
> 
>> Try Flike I on ebay
>> http://cgi.ebay.co.uk/lucent-GPS-Timing-Reference-Antenna-26db-Gain-N-connect_W0QQitemZ290369619357QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item439b60c59d
>>  
>> Robert G8RPI.
>> 
>> --- On Tue, 15/12/09, Charles P. Steinmetz <charles_steinmetz at lavabit.com> wrote:
>> 
>> 
>> From: Charles P. Steinmetz <charles_steinmetz at lavabit.com>
>> Subject: [time-nuts] Source for Trimble Bullet GPS antennas?
>> To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
>> Date: Tuesday, 15 December, 2009, 22:33
>> 
>> 
>> For initial testing of my Thunderbolt I'll use a Garmin GA 29 marine antenna that's lying around, but for my permanent installation I'd like to find an actual Trimble Bullet.  The web turns up mostly scam links (search services, etc.), and so far I've not found a source.  Any suggestions?
>> 
>> Probably best to reply direct to avoid wasted reflector bandwidth.
>> 
>> Thank you,
>> 
>> Charles
>> 
>> 
>> 
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