Hi
The antenna it's self in these things is a constrained device. Gain and
directivity are directly related to each other. If you want to uniformly cover
a full hemisphere the gain will be 3 db relative to isotropic. If it is more,
you are missing signal somewhere.
Of course what you want is
I agree it is the antenna. I have a Volute left over from a boat GPS and it
is serving me well. I have no idea how well it prevents multi path, but I
get a strong signal. A little trivia, the first GPS receiver used a Volute
Bert Kehren Miami
In a message dated 12/16/2009 9:29:03 P.M. East
At 09:28 PM 12/16/2009, Charles P. Steinmetz wrote...
it's not the LNA that does the serious work, but rather the physical
antenna...I have RF design experience, based on which I wouldn't put
any faith in noise figure specs from any but the most reputable
suppliers. I assume Trimble is one su
Bob wrote:
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 fi
t;
>> Robert G8RPI.
>>
>> --- On Tue, 15/12/09, Charles P. Steinmetz
>> wrote:
>>
>>
>> From: Charles P. Steinmetz
>> Subject: [time-nuts] Source for Trimble Bullet GPS antennas?
>> To: "Discussion of precise time and frequency measurement"
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
wrote:
From: Charles P. Steinmetz
Subject: [time-nuts] Source for Tr
] Source for Trimble Bullet GPS antennas?
To: "Discussion of precise time and frequency measurement"
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
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?
Pro
