Ok, I recently bought a Carlson BRX+6 base/rover and am about halfway round the learning curve.?ÿ My question is whether there is an advantage of sometimes not tracking all of the available constellations??ÿ
Thanks
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There is NO advantage to tracking fewer constellations. More is better. More constellations is better. More satellites is better.
There is the possibility that if you have a constellation with 3 or fewer healthy satellites being tracked, some software may get wrapped around the axle trying to resolve that data - I suspect that all GPS software these days would recognize the issue and just wouldn't use that constellation.
In my experience, no.
I have had maybe two or three incidences of a rover failing to fix/stay fixed, and turning off GLONASS cleared up the issue. I believe it was a bad or missing ephemeris file. But that is not what you are asking.
I guess tracking fewer constellations at both base and rover means less information being transmitted in the correction message by the UHF radio, which means longer battery life...