[time-nuts] GPS Interference Question

[Tom Holmes]

Sticking with the intent to keep this non-political, what good is a filter
if the offending signal is within the necessary passband?

Tom Holmes, N8ZM
Tipp City, OH
EM79


> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Chuck Forsberg WA7KGX N2469R
> Sent: Friday, September 30, 2011 10:55 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] GPS Interference Question
> 
> If LightSquared deploys their high powered LTE network in the satellite
band
> the GPS world will become very interesting indeed.  Are LightSquared
willing
> to spend $20,000 to upgrade the GPS on my Skylane to a new model which
> does not yet exist?
> 
> With that many transmitters we may experience areas where RF from multiple
> high power transmitters creates hot spots.  In some places pieces of metal
> with non Ohmic bonds will create mixing products, some of which may fall
> directly within GPS bands.  These effects have not been simulated.
> 
> Who knows who the FCC is listening to - the GPS industry including
millions
> of current users, or those who appear to have bought under the table
favor.
> This could make Solyndra look like small change.  Film at 11.
> 
> 
> On 09/30/2011 07:02 AM, Marco IK1ODO -2 wrote:
> > At 15:44 30-09-11, Jason wrote:
> >
> >> To filter out the L2 signal, would an actual GPS receiver have to be
> >> replaced / modified?
> >>
> >> Or would a more simple and cheaper alternative be to get a new
> >> antenna (with fancy filtering) to replace my existing roof-top
> >> antenna and expect all my old equipment to be happy?
> >
> > I think that a new antenna/filter/amplifier unit would be ok. But the
> > problem is the installed base of receivers, including all those costly
> > units used for geodesy or navigation, that have embedded antennas.
> > Those will be hard to modify.
> >
> > 73 - Marco IK1ODO
> >
> >
> >
> > _______________________________________________
> > time-nuts mailing list -- time-nuts at febo.com
> > To unsubscribe, go to
> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > and follow the instructions there.
> >
> 
> --
> Chuck Forsberg WA7KGX N2469R     caf at omen.com   www.omen.com
> Developer of Industrial ZMODEM(Tm) for Embedded Applications
>    Omen Technology Inc      "The High Reliability Software"
> 10255 NW Old Cornelius Pass Portland OR 97231   503-614-0430
> 
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.