Hi, I have two AT575-90s - the Aeroantenna L1 chokering - resold by CMC, Leica and others. They work really well as witnessed by others here. One nice touch is that they - at least the CMC badged - come with a "marine"-thread to 5/8" survey-mount adapter.
However, this model is not present at http://www.ngs.noaa.gov/cgi-bin/query_cal_antennas.prl?Model=AER so it does not count as a true geodetic antenna. ;-) The cone cover is indeed good. Snow/ice-buildup would have been a showstopper this year in Sweden. For real geodetic use "spike"-cones are long out of fashion. From my understanding a thin plexiglas makes good cone material. Combine a halfsphere (upper) with a suitable lenght "tube". Make the center of the sphere as close to the phase center of the antenna as possible. Here is an illustration. http://swepos.lmv.lm.se/stationer/opp.htm -- Björn > Hi > > All of these gizmos are going to work better outdoors than indoors. Coming > up with a rainproof / bird proof / bug proof cover for the choke ring that > also is rational at RF is one more "gotcha". Both loss and dielectric > distortion effects are worth worrying about. > > Bob > > > On Mar 14, 2010, at 1:23 PM, [email protected] wrote: > >> In a message dated 14/03/2010 15:46:55 GMT Standard Time, >> [email protected] writes: >> >> I would call those aluminum cake, not pie, pans. It looks like you >> bought >> a set for making wedding cakes. >> >> Is there a different definition of "pie" in G8 land? >> ----------------- >> Hi Chuck >> >> No other definition that I'm aware of, other than David's of course, but >> I >> was just replying to Brian, KD4FM, so I guess that makes it a US of A >> definition:-) >> >> regards >> >> Nigel >> GM8PZR >> _______________________________________________ >> 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. >> > > > _______________________________________________ > 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. > _______________________________________________ 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.
