[time-nuts] GPS backup for the stationary time and frequency user

jmfranke jmfranke at cox.net
Thu Oct 7 21:32:52 EDT 2010


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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