[time-nuts] Important parameters for a GPS/GNSS antenna

[Poul-Henning Kamp]

--------
In message <554BC3C3.7090305 at earthlink.net>, Jim Lux writes:

>>> I wonder if anybody ever made a rotating GPS antenna to average out the
>>> X-Y phase-center offset ?
>>
>> There is a severe mechanical problem with that. Moving contacts
>> are very hard to keep electrically stable

You wouldn't need any of that because there is no need for continous
one way rotation, a piece of coax would do just fine.

Simply rotate the antenna forth an back between 0 and 360 degree
compas.

Let the coax drop from the antenna to a horizontal coil so
that the stress is converted from torsion to longitudal tension
and you'de don.

Doing continous rotation may not even be a good idea, rotating
90 degrees every hour is probably a better idea from a processing
point of view, as that wouldn't need special software.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.