On Fri, Mar 4, 2011 at 10:31 AM, Bob Camp <[email protected]> wrote: now it's mainly military use. Obviously these guys are a bigger deal for civilians than the military. > > So the question is - do the built in splitter filters have any real rejection > 15 to 50 MHz off of center?
Most GPS antenna are active. I'm a bit more worried about the preamps built into the antenna. A filter external to the antenna will not protect the built-in preamp. But there are all kinds of designs for home built GPS antenna. A helix antenna is not hard to make. Timing GPSes at fixed sites can use antenna that have a deep null aimed at the nearby transmitter (which is also fixed) People at fixed sites will have it easy. Mobile GPS users will not be able use antenna design. -- ===== Chris Albertson Redondo Beach, California _______________________________________________ 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.
