[time-nuts] GPS interference and history...

[Christopher Quarksnow]

Also given that Galileo is subtantially delayed due to European budget
constraints
http://www.engadget.com/2010/10/07/eus-galileo-satnav-system-orbiting-way-past-budget-delayed-unt/
it does not seem like it can be expected to mitigate the issue for
navigation purpose, aside political implications and the fact that every
aircraft might not have combined receivers.
Chris
On Fri, Jun 10, 2011 at 12:42, Bob Camp <lists at rtty.us> wrote:

> Hi
>
> The FCC (like most US agencies) has a mission to promote as well as
> regulate. The promotion side is what drives them to allocate frequencies in
> a way that you can reasonably produce gear. They have always come back
> years
> later and tried to change things around. Every time, the same issues get
> hashed over. Sometimes a change actually gets made, sometimes not.
>
> What's surprising with the GPS impact here is that the usual conversations
> are taking place a bit late in the process. The impact on legacy timing
> gear
> is one part of a much larger issue here. Hopefully it does not get lost in
> the back and forth. There's an enormous amount of gear out there that gets
> timing off of GPS.
>
> Bob
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of William H. Fite
> Sent: Friday, June 10, 2011 9:47 AM
> To: shalimr9 at gmail.com; Discussion of precise time and frequency
> measurement
>  Subject: Re: [time-nuts] GPS interference and history...
>
> You folks are all far more knowledgeable than I on these issues so I have a
> question:
>
> To what extent, from both an engineering perspective and from the
> standpoint
> of public policy, should it be the obligation of transmitter and receiver
> manufacturers to design and build devices with sufficient filtering, et
> alia, to avoid or at least vastly minimize problems such as those described
> below by Didier?
>
> I suppose from an engineering standpoint the issue is one of do-ability and
> from the public policy perspective, how much it is reasonable to expect
> both
> those who transmit and those who receive to pay for equipment that will
> minimize interference problems, given that we are running out of spectrum
> and demands for chunks of it will continue to pour in.
>
> Both technical information and philosophical ramblings will be appreciated.
>
> Bill
>
> On Fri, Jun 10, 2011 at 9:16 AM, <shalimr9 at gmail.com> wrote:
>
> > The problem is that many FM receivers leak LO signal, so if 2 receivers
> are
> > next to each others and set 10.7 MHz apart, one will be receiving the LO
> of
> > the oter.
> >
> > Didier KO4BB
> >
> > Sent from my BlackBerry Wireless thingy while I do other things...
> >
> > -----Original Message-----
> > From: Chuck Forsberg WA7KGX N2469R <caf at omen.com>
> > Sender: time-nuts-bounces at febo.com
> > Date: Thu, 09 Jun 2011 12:16:48
> > To: <ehydra at arcor.de>; Discussion of precise time and frequency
> > measurement<time-nuts at febo.com>
> > Reply-To: Discussion of precise time and frequency measurement
> >        <time-nuts at febo.com>
> > Subject: Re: [time-nuts] GPS interference and history...
> >
> >  The image frequency for an FM receiver with a 10.7 mHz IF
> > is 21.4 mHz above or below.  Perhaps they were worried about
> > receivers with IFs in the 5 mHz range?
> >
> > --
> > 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.
> > _______________________________________________
> > 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.
> >
> _______________________________________________
> 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.
>
>
> _______________________________________________
> 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.
>