[time-nuts] Frequencies used for GPS

Chuck Harris cfharris at erols.com
Thu Oct 20 13:52:34 UTC 2011


Here is the standard antenna for the T-Bolt.  Not a helix, but
rather some sort of crossed dipole.

The feed point is the corners of the two V shaped elements, forming
a sort of bowtie  ><  With the ends capacitively coupled to the
ground plane.

-Chuck Harris

Jim Lux wrote:

>> If anyone can tell me the desirable characteristics of an antenna for
>> GPS, I would like to know. The antenna will be mounted outside and
>> needs to be waterproof, so I'm not looking to fit the antenna in a
>> small package.
>>
>
> most GPS antennas are helices of one sort or another (quadrifilar is popluar) and
> helices are broad band enough that designing for one gets you all frequencies.
>
> There are also a fair number of microstrip patch antennas out there, but they tend to
> need stacked patches to get L1, L2, and L5
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