[aprssig] GPS Intgrated Engine

Doug Ferrell kd4moj at kd4moj.org
Tue Mar 28 15:05:27 CST 2006

On Tue, 28 Mar 2006, Stephen H. Smith wrote:

> Further, a root-mounted GPS active GPS antenna will often overload, 
> block, and knock the GPS out of lock every time your own 25-50W two 
> meter or UHF rig keys up, if the antennas aren't separated far enough.   
> This usually isn't a problem on a ship or aircraft where the antennas 
> can be farther apart, but is often a problem on cars.  

   That's not always true.... yes it's best to separate the antennas
properly but I know that my trimble (active) antenna on my work vehicle is
10 inches away from my 35 watt 800Mhz radio modem gain antenna. GPS
dosen't loose lock when the modem is transmitting. I was using the trimble
config program wantching the satllites while I was doing querries (modem
transmitting) on the MDC as a test. Of course I wouldn't mount antennas
like this... the city radio shop did. One day the GPS will probably blow
up from the RF!  


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