[time-nuts] GPS Interference Question
bownes at gmail.com
Fri Sep 30 15:11:57 UTC 2011
Exactly. The narrower the filter, the more it will cost. In general.
On Fri, Sep 30, 2011 at 11:10 AM, Tom Holmes <tholmes at woh.rr.com> 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
>> -----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
>> the GPS world will become very interesting indeed. Are LightSquared
>> 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
>> of current users, or those who appear to have bought under the table
>> 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
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>> 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
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