On 6 February 2018 at 03:33, John Green <[email protected]> wrote: > https://www.ebay.com/itm/High-Precision-L1-L2-GNSS-GPS-GLONA > SS-BeiDou-RTK-CORS-survey-antenna/162718512935?ssPageNam > e=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649 > > Listed on eBay as a L1/L2 antenna with decent specs.
I used to work in the antenna industry selling 'professional' antennas - not aimed at the amateur radio market. Many specifications are invented to be better than a competitor. The competitors do it too, so it is not just one company. If you sell antennas with valid specifications, it would be next to impossible to sell them, as competitors will have higher specifications. Another RF engineer, who I don't know from working with antennas, said to me that antennas are a still a charlatan's paradise. With antennas, probably more than any other device, I would believe the specifications if I could verify them. Unfortunately, for that sort of antenna, I don't know how to verify them. If nothing else, I would ask the seller for a copy of the test reports that back up the specifications. I got a couple of WiFi antennas free from eBay, after proving the gain specifications were vastly exaggerated. Depending on the phase of the moon, the numbers that came up in last months lottery, eBay policy changes with reguard to who pays the return shipping fee on items that are not as described. If you can show its the seller, then in many cases they will not wish to pay the return cost. Dr David Kirkby Ph.D C.Eng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT, United Kingdom Registered in England and Wales as company number 08914892 http://www.kirkbymicrowave.co.uk/ Tel 01621'680100 / +44 1621-680100 <01621%20680100> _______________________________________________ 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.
