While you can try and run multiple GPS receivers off a single antenna using an off the shelf mini-circuits splitter, a bias tee, and a handful of dc blocks, you're likely to run into just this kind of problem.
It's more than just the "normal" HP overdesign that has their GPS splitters like the 58535A comprising: an input narrowband (L1) filter feeding a low-noise gain block, the gain block feeding a splitter, and each output leg of the splitter having its own narrow band (L1) filter followed by a pad to improve isolation/return loss. 73 bob k6rtm in not yet raining silicon valley ------------------------------ Message: 6 Date: Mon, 3 Jan 2011 15:59:24 -0000 From: "Rob Kimberley" <[email protected]> Subject: Re: [time-nuts] GPS Antenna -Receiver Mutual Interference... To: "'Discussion of precise time and frequency measurement'" <[email protected]> Message-ID: <[email protected]> Content-Type: text/plain; charset="us-ascii" 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: [email protected] [mailto:[email protected]] On Behalf Of Mark J. Blair Sent: 03 January 2011 2:19 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] GPS Antenna -Receiver Mutual Interference... 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. -- Mark J. Blair, NF6X <[email protected]> Web page: http://www.nf6x.net/ GnuPG public key available from my web page. _______________________________________________ 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.
