Well, I have two HP conical antennas 4 feet apart and just below the roof level, with an elevation cutoff of 30 degrees for the large and growing oak trees on 3 sides. Fifty feet of RG-8 each connects to two Z3801A receivers.
I've had no trouble in a dozen years, here in Minneapolis. T1 to GPS runs at about +4E-008 for both from GPSCon. My son runs a 50' deep sea fishing boat out of Ocean City, MD. It has two GPS navigation antennas less than 4 feet apart up on the signal mast. It also has portable GPS receivers used by fishermen who want to learn his fishing spots, but these are about 10' away. He has had no trouble with navigation. What would be the symptoms of interference? A disturbance in PPS signals at the 10E-12 level? Bill Hawkins -----Original Message----- From: shali...@gmail.com Sent: Monday, January 03, 2011 1:50 PM The additional advantage is to give you diversity and some immunity against multipath (at least it reduces the probability that both receivers will be affected at the same time due to weird constellation issues or local interference). But it now creates an issue which is how do you know who is right when both receivers don't agree... Didier KO4BB -----Original Message----- From: "Rob Kimberley" <r...@timing-consultants.com> Sender: time-nuts-boun...@febo.com Yes, I've seen this. On installations in the past, when we were putting up dual GPS systems, we always put them at least 10 metres apart. What is actually best practice, is to put one at one end of building and the other one at the other end. Rob Kimberley -----Original Message----- From: Mark J. Blair Sent: 03 January 2011 2:19 AM On Dec 30, 2010, at 6:53 PM, Burt I. Weiner wrote: > Has anyone run into a situation where two GPS Navigation type Antenna/Receivers interfere with each other? It's possible that LO leakage from one is jamming the other. When doing mobile GPS receiver testing at work with a single antenna feeding multiple receivers through a splitter, we sometimes had to insert attenuators in each receiver's antenna feed to keep them from jamming each other. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.