After starting off with a single GPS module on a RaspberryPi, and discovering the issues of just having a single clock... I now have three GPS receivers (and a fourth on the way) of various types, each with their own antenna. I'm aware that I'm heading off down an interesting road that will consume ever more of my time, but at the moment it's still fun (-:
To remove the difference of multiple antennas (different skyviews etc), I'm thinking about using a single antenna and "distributing" the feed to the receivers. I should also add that I'm doing this in the UK (in central London), and as inexpensively as possible. Reading back through the mailing list several people appear to have used SatTV splitters with GPS signals to apparently good results, and I've ordered one of these https://vision-products.co.uk/8-way-single-port-dc-pass-splitter/ which if I understand it correctly, will passthrough DC from one port, and block DC from the other ports. From other reading of the mailing list, it looks as if I will also need to present a DC load to the other receivers, and if I've read corectly this would be a "Bias tee" used with a resitive load instead of a DC voltage, but am not sure if I have understood correctly. I'm aware of impedance matching issues with using a mix of 75 ohm and 50 ohm parts, but as I said, I'm doing this as inexpensively as possible, and a 58536A is way over budget at the moment. Any suggestions gratefully received. Cheers Arne _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
