[time-nuts] pin-wheel antenna
bg at lysator.liu.se
bg at lysator.liu.se
Mon Apr 22 14:57:04 UTC 2013
> Hi Dave,
>
> On 04/21/2013 10:32 AM, David Kirkby wrote:
>> On 20 April 2013 20:52, Tom Van Baak<tvb at leapsecond.com> wrote:
>>
>>> For the rest of you:
>>>
>>> http://www.leapsecond.com/images/gps-pinwheel-1.jpg
>>> http://www.leapsecond.com/images/gps-pinwheel-2.jpg
>>>
>>> It's a thing of mysterious beauty. And the GPS World photo saves me
>>> from the temptation to break open my own pinwheel antenna just to see
>>> what's hidden inside.
>>>
>>> /tvb
>>
>> Does the antenna work better than other types?
>
> You should get close to choke-ring antenna performance at a much smaller
> size. For many purposes its good enough.
Note that the traditional JPL type choke-ring is beeing replaced by more
advanced designs in the money-is-no-problem market.
http://www.topconpositioning.com/sites/default/files/PN-A5_white_paper.pdf
http://www.novatel.com/assets/Documents/Papers/3D_choke_ring.pdf
--
Björn
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