[time-nuts] Speaking of Costas loops (WAAS)

[Dennis Ferguson]

On 10 Jul, 2013, at 14:08 , David I. Emery <die at dieconsulting.com> wrote:
> It seems completely inconceivable to me that either the antenna
> system (particularly feeds) or transponder RF hardware on any commercial
> Ku or C or Ka or X band satellite could possibly be frequency agile
> enough to tune to 1575.42 MHz unless it was purpose designed to radiate
> on that frequency from the start.
> 
> 	So any hosted WAAS payload is completely application specific.

If you look at the pictures here

    http://www.orbital.com/NewsInfo/Publications/Galaxy_Fact.pdf

the satellite on the right has things sticking out the bottom, in the
back corner, that are missing on the others and that look a lot like
the antennas on GPS satellites.  The WAAS satellite is also 350 pounds
heavier than the other two even though the C-band payload is identical
on all three, so it seems like there could be a fair amount of extra
stuff added for WAAS support.

Dennis Ferguson