David Woolley wrote:
John Hasler wrote:
Shipping products lacking adequate filtering for adjacent band
interference just because those bands are not presently in use is just
plain bad engineering.
The new adjacent channel signal could be arbitrarily strong. You have to
make some assumptions,
Those adjacent bands have been reserved for sat signals, which means
_very_ low power levels near an earth-based receiver.
With a fancy hack of the FCC system, a US company got a waiver to use
the same band for 40K earth-based transmitters, each with KW-level
output power.
The result would be an adjacent signal 5-6(?) orders of magnitude
stronger than any gps sat signal, making an an effective flat-phase
filter nearly impossible, at least at a consumer-grade cost figure.
There's no way it will be accepted though, the US simply can't live with
a GPS system that works everywhere in the world, except in the US.
Terje
--
- <Terje.Mathisen at tmsw.no>
"almost all programming can be viewed as an exercise in caching"
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