Hi There are a number of reasons to believe that these antennas are worse than the typical “telecom GPS” antenna for L1 only duty driving a TBolt. If you are going to do L1 / L2 work with something like a NetRS, then indeed you will need a dual band antenna. These (the $99 ones) are the lowest cost “new in box” L1 / L2 antennas that I have seen. One would *guess* that their close to horizon multi path rejection is not quite as good as a Trimble Zephyr, a Novatel Pinwheel, or a choke ring. The ones from China also don’t cost $1800 to $6000 when new either …
Bob > On Feb 15, 2018, at 4:31 AM, Christoph Kopetzky <c...@cksd.de> wrote: > > Moin, > are in the meantime any experiences with these gps antennas from the china > seller (ms_geo)? > I found two type of them from the same seller: > > 1) > https://www.ebay.com/itm/High-Precision-L1-L2-GNSS-GPS-GLONASS-BeiDou-RTK-CORS-survey-antenna/162718512935?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649 > > <https://www.ebay.com/itm/High-Precision-L1-L2-GNSS-GPS-GLONASS-BeiDou-RTK-CORS-survey-antenna/162718512935?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649> > this one is the 3.3 - 18 V version with 5 dB antenna gain and 42 dB LNA gain > for appr. 100 US$ > > and > > 2) > https://www.ebay.com/itm/High-Precision-GNSS-GPS-GLONASS-BeiDou-RTK-CORS-survey-machine-control-antenna/162710405447 > > <https://www.ebay.com/itm/High-Precision-GNSS-GPS-GLONASS-BeiDou-RTK-CORS-survey-machine-control-antenna/162710405447> > this one has 3.3 - 10 V voltage requirement and nearly the same gain values > but 85 US$ > > Does anyone have one oth them up and running? > > Are they much more better as a Symmetricom 58532A antenna ore the puck head > variant? > > If yes I would give it also a try but the shipment time from goods from china > are very high. Here to Germany there are timeframes from four to eight weeks > normal. :( > > But the price > - > Chris > Am 13.02.2018 um 03:05 schrieb Bob kb8tq: >> Hi >> >> Sitting here casually reading the data sheets for some of the modern Trimble >> survey receivers - they have gone to 7.2V (just below your 7.5V trigger >> point) >> as an antenna supply voltage. >> >> Who knows what that might imply relative to this antenna. >> >> Bob >> >>> On Feb 11, 2018, at 12:44 PM, John Green <wpxs...@gmail.com> >>> <mailto:wpxs...@gmail.com> wrote: >>> >>> They have issued a refund. The seller said that my antenna was defective. >>> This is kind of a strange outfit. They are in Russia selling Chinese goods, >>> shipped from China. Since I don't have to return it, I will disassemble it >>> to see what went bad. I replied that if he could assure me that it would >>> work on 12 volts, I might order another. >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com <mailto:time-nuts@febo.com> >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> <https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> >>> and follow the instructions there. >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com <mailto:time-nuts@febo.com> >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> <https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> >> and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
