[time-nuts] GPS antenna??

[Bob Camp]

Hi

If this is a modern building, there may be some pretty good GPS location data associated with it. If you can find that data and if you can find the building plans you might be able to come up with a pretty good location for the window.

Yes that's a lot of if's and a lot of work.

Bob

On Apr 9, 2013, at 5:56 AM, Azelio Boriani <azelio.boriani at screen.it> wrote:

> One satellite, OK, but before a GPSDO can use 1 satellite it must have the
> normal satellite visibility to complete the autosurvey (usually 10K seconds
> long). You can enter the exact lat/lon, if available, and start the 1
> satellite operation (known as position hold mode) at once but, usually,
> surveyed coordinates of a new antenna installation are not available.
> 
> On Tue, Apr 9, 2013 at 10:27 AM, Grant Hodgson <grant at ghengineering.co.uk>wrote:
> 
>> Alan
>> 
>> As has already been stated by others, if the purpose of the GPS signal is
>> for a GPSDO, then putting an active patch next to a SW facing window should
>> work fine.  No need to re-radiate.  You only need to receive 1 satellite in
>> order to get a timing signal - more satellites will give better (lower)
>> jitter/ADEV, but if you just want an accurate frequency source for a
>> counter or signal generator then the setup you describe should be fine.
>> 
>> If that's the case, then it might be worth taking a Rubidium source as a
>> higher-performance back-up than the GPSDO in holdover, although some GPSDOs
>> are more equal than others in holdover performance.
>> 
>> regards
>> Grant
>> 
>> Quoting time-nuts-request at febo.com:
>> 
>>> 
>>> Hi all an interesting problem you may have encountered, I want to use a
>>> GPS
>>> frequency standard inside a building with no opening windows (opening
>>> windows are known as air conditioning in the UK :-))  )
>>> This is part of a two day amateur microwave conference so we should have
>>> the
>>> expertise.
>>> 
>>> I intend to try and pass the signal through a a double glazed glass window
>>> unit (hopefully not metalised) using a couple of patch antennas. The outer
>>> GPS antenna is active so will need  a 5v supply via an inserter. Inner
>>> patch
>>> active, outer patch passive to avoid problems of feedback. Main antenna
>>> can
>>> be shielded from the "coupling" either physically or with a slab of
>>> absorber.
>>> 
>>> Has anyone tried this?.... does it work?.....any gotchas?
>>> 
>>> Thanks
>>> Alan
>>> G3NYK
>>> 
>>> 
>>> 
>>> 
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