[time-nuts] eBay GPS antennas
kb8tq at n1k.org
Fri Feb 16 13:47:24 EST 2018
Well, the interesting point about Glonass timing is that it is independent of the
GPS empire. Galileo is another independent time source. Running a GPSDO
linked to each one would let you inter-compare the time from each of them.
Indeed I would *guess* that Galileo would do pretty well. Reports to date on
Glonass have not been encouraging. It still might be interesting to do. Once
Furuno releases the Galileo firmware, one of the Opus 7 based devices should
be able to run each of them. uBlox or some of the others would also do the
> On Feb 16, 2018, at 1:31 PM, Stewart Cobb <stewart.cobb at gmail.com> wrote:
> FYI, Antcom and AeroAntenna are two manufacturers of high-quality
> American-made GPS / GNSS antennas. Antcom's datasheets are confusing to
> read, and AeroAntenna hides theirs behind a customer-login barrier, so most
> of eBay doesn't know exactly what they are. This means that good antennas
> are often available cheap.
> For example, any AeroAntenna whose part number starts with "AT2775" is a
> dual-frequency L1/L2 GPS antenna. AT2775-42 is a near-survey-grade antenna,
> and one of them is available right now (item 263500294711) at a starting
> bid of $20, after expiring yesterday with no bids at $25.
> Several other AT2775 antennas are on eBay for under $200. Any of these
> would be excellent for time-nut purposes.
> IMHO, Glonass coverage is not useful for precision timing. If you don't
> have a good enough antenna installation to get continuous GPS coverage,
> you're not really doing precision timing. If you are getting continuous GPS
> coverage, Glonass doesn't add anything.
> Disclaimer: I have no relationship to either company mentioned, other than
> previously being a satisfied customer of both companies. I have no
> connection to any sales currently listed on eBay.
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