[time-nuts] GPS backup for the stationary time and frequency user
jmfranke
jmfranke at cox.net
Fri Oct 8 01:32:52 UTC 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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