[time-nuts] eBay GPS antennas

[Trevor N.]

Javad charges an extra us$1500 for "GLONASS .2mm Dynamic Calibration"
of its triple-frequency timing receiver board:
http://www.javad.com:80/jgnss/products/options/gclb.html

https://www.javad.com/dynamic/Shop/Product/3268
(the TRE-3 appears to be the only triple-frequency part with the
"Precise Timing" option available (costs about $15k with all systems
enabled)



Magnus Danielson wrote:
>Hi,
>
>A complicating factor with GLONASS is the frequency separation of the
>satellites which causes several aspects of calibration issues.
>
>I know they have changed operational aspects which have reduced
>uncertainty significantly. This is also something that have been worked
>at with the GPS system continuously.
>
>It's a bowl of mixed issues.
>
>However, the more systems and the more bands we use, the better we get
>at finding discrepancies and mitigate them. The "all" system and
>frequencies is however still very expensive.
>
>Cheers,
>Magnus