My question had nothing to do with cost or design, but only that you can't filter out a signal that is in the passband you need for your own channel. Even a square passband won't help that problem, fantasy that it is.
Tom Holmes, N8ZM Tipp City, OH EM79 > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Chuck Forsberg WA7KGX N2469R > Sent: Friday, September 30, 2011 11:20 AM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] GPS Interference Question > > A wider filter with steep skirts tends to cost more. > Constraints on noise figure, dynamic range, group delay. and flatness > add more cost > and power consumption. > > > On 09/30/2011 08:11 AM, Bob Bownes wrote: > > Exactly. The narrower the filter, the more it will cost. In general. > > > > > > > > On Fri, Sep 30, 2011 at 11:10 AM, Tom Holmes<[email protected]> wrote: > >> 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: [email protected] [mailto:[email protected]] > 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 -- [email protected] > >>>> To unsubscribe, go to > >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >>>> and follow the instructions there. > >>>> > >>> -- > >>> Chuck Forsberg WA7KGX N2469R [email protected] 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 -- [email protected] > >>> To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >>> and follow the instructions there. > >> > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] > >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > >> > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > -- > Chuck Forsberg WA7KGX N2469R [email protected] 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 -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
