Hi I get the impression that they do indeed run things up a band at a time and pretty much ignore what is in-between. Again, we’re talking about the “affordable” end of the new antenna range here and not the price is no object part of the market.
Bob > On Jan 31, 2019, at 12:45 PM, Attila Kinali <[email protected]> wrote: > > On Thu, 31 Jan 2019 08:51:46 -0500 > Bob kb8tq <[email protected]> wrote: > >> Looking at network analyzer sweeps, it becomes pretty apparent that whatever >> combination of things are involved, they only work inside each of the target >> sub-bands. >> Once you get to the edge, it all falls apart. It comes back together once >> you get to >> the edge of the next sub-band. Some of that is intentional filtering so >> sorting it out >> that way … not so much. > > Transmission line phase shifters are pretty narrow band. > Getting them to 5% bandwidth with reasonable phase and > amplitude stability is already not straight forward. But > for a combined GPS/Galileo/Glonass L1/L2/L5 antenna, > a bandwidth of over 30% would be needed. Not an easy task > at all. Making them work for a few select bands is a lot > easier, if still a bit non-standard. At least EM simulation > tools help a lot with that. > > Attila Kinali > > -- > It is upon moral qualities that a society is ultimately founded. All > the prosperity and technological sophistication in the world is of no > use without that foundation. > -- Miss Matheson, The Diamond Age, Neal Stephenson > > _______________________________________________ > 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. _______________________________________________ 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.
