[time-nuts] GPS antenna??

[Alan Melia]

Hi Tom Ah I didnt realise there were such beasts....I probably have not the 
time left now but it is one to consider.
Yes I might have to watch the patch polarisation. I did consider two L-band 
waveguide transitions at one stage but thought that might be going too far 
:-)) I thought of the on-glass antenna used in the days of "The Brick" on 
mobile cellular, or amateur and commercial 2-way radios.

Thanks again for the ideas.

Alan
G3NYK
----- Original Message ----- 
From: "Tom Van Baak" <tvb at LeapSecond.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Monday, April 08, 2013 10:12 PM
Subject: Re: [time-nuts] GPS antenna??


> Alan,
>
> Google for words like GPS re-radiator or GPS repeater. There are also 
> units on eBay. If not to buy, at least to study examples.
>
> The one I have is made by www.gpssource.com but it seems you could build 
> one yourself. It's easy to test by looking at your indoor SV count and 
> reception levels. With patch antennae you don't have to worry about RHCP 
> issues, right?
>
> /tvb
>
> ----- Original Message ----- 
> From: "Alan Melia" <alan.melia at btinternet.com>
> To: "time-nuts measurement" <time-nuts at febo.com>
> Sent: Monday, April 08, 2013 9:59 AM
> Subject: [time-nuts] GPS antenna??
>
>
>> 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
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to 
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.