[time-nuts] eBay GPS antennas

Magnus Danielson magnus at rubidium.dyndns.org
Sat Feb 17 17:29:00 EST 2018

As I was saying, indeed.

There is a huge difference between affordable gear and cutting edge gear
in price and performance.

With GLONASS there are several extra biases to worry about.

It would be nice if prices of these things could drop. Already having
GPS, GLONASS, GALILEO, BEIDOU on my mobile phone shows we move along


On 02/17/2018 09:31 PM, Trevor N. wrote:
> 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
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