[time-nuts] GPS backup for the stationary time and frequencyuser

jmfranke jmfranke at cox.net
Fri Oct 8 01:35:53 UTC 2010


When I said the feed would work, I was meaning it would work if LHC.  The 
illustrations and text imply you could just place a normal GPS receiver at 
the feed location, but the polarization would be wrong.

John  WA4WDL

--------------------------------------------------
From: "jmfranke" <jmfranke at cox.net>
Sent: Thursday, October 07, 2010 9:32 PM
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Subject: Re: [time-nuts] GPS backup for the stationary time and 
frequencyuser

> You are correct.  The dish feed should be LHC.  The feed would work for 
> WAAS or other GPS satellites while in the beam pattern, but reject 
> satellites seen through spill over, etc.
>
> John  WA4WDL
> --------------------------------------------------
> From: "Magnus Danielson" <magnus at rubidium.dyndns.org>
> Sent: Thursday, October 07, 2010 9:28 PM
> To: <time-nuts at febo.com>
> Subject: Re: [time-nuts] GPS backup for the stationary time and frequency 
> user
>
>> On 10/08/2010 03:02 AM, Robert Harmon wrote:
>>> Saw this interesting article several years ago about using an 18 inch 
>>> dish
>>> pointed at a WAAS satellite:
>>>
>>> http://www.freqelec.com/gps_gnss/waas_for_telecom_wp_5-06.pdf
>>
>> Notice footnote 12 (on page 9).
>>
>> Will not a standard GPS antenna have the wrong circular polarisation when 
>> looking into the mirror image of the offset antenna?
>>
>> I would expect the thing to work due to antenna gain and leakage in the 
>> wrong antenna mode. Ah well...
>>
>> Cheers,
>> Magnus
>>
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