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> On 13 Jul 2022, at 02:34, Bob kb8tq via time-nuts <time-nuts@lists.febo.com> > wrote: > > Hi > > The “typical” Symmetricom cone shaped GPS antennas are targeted at > cell phone tower applications. Being mounted on the same structure > as multiple cell transmitters puts them in a significant RF environment. > They have a *lot* of filtering built into the antenna to try to prevent > overload > issues. > > As with a lot of things, Symmetricom simply rebrands antennas made by > others. Not all cone shaped antennas are identical. However it’s a pretty > good bet that most of them are very similar to what Symmetericom ( and > the other folks ) supply for cell applications. > > The “other end” of the range are the multi band saucer shaped “survey” > antennas. They tend to have a lot less filtering and be more focused at > allowing the user to access a wide range of frequencies ( both GNSS and > supplemental services) via a single device. Lots of filtering also tends to > mess up delay here or there, that’s not a great thing for high precision > work. > > Bob >> Bob, That was true 10-15 years ago. Good quality surveying antennas often has quite decent filtering on each band they are designed for. /Björn _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-le...@lists.febo.com
