[time-nuts] Speaking of Costas loops

Azelio Boriani azelio.boriani at screen.it
Wed Jul 3 19:42:00 UTC 2013


Sure about the "bent pipe"? If so it seems that much power is required
at the transmitting ground station...

On Wed, Jul 3, 2013 at 7:48 PM, Attila Kinali <attila at kinali.ch> wrote:
> On Wed, 3 Jul 2013 08:29:02 -0400
> Bob Camp <lists at rtty.us> wrote:
>
>> There are two batches of GPS / WAAS sats up there:
>>
>> 1) The ones with numbers above 100 that are geosync and that only do WAAS
>>
>> 2) The ones with numbers <= 32 that do nav. These are not geosync.
>>
>> I believe the only ones with corrected / high stab clocks on board are
>> those in the second group. The stuff in the first group aren't dedicated
>> sats, just leased transponders on conventional multipurpose geosync birds.
>
> I don't know about WAAS, but AFAIK the EGNOS signals are generated on
> ground using Cs references and retransmitted by the satelites using
> a "bend pipe". Ie. the signals should be of time-nut quality even without
> high accuracy frequency standards in the birds themselves.
>
> (Sorry, i'm not able to find where i read about that, so no references today)
>
>                         Attila Kinali
>
> --
> The people on 4chan are like brilliant psychologists
> who also happen to be insane and gross.
>                 -- unknown
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