On 9/9/2013 11:08, Paul wrote:
Although the inexpensive yet high sensitivity units are nice I'm not
sure why someone would choose a positioning MTK (e.g. Adafruit) over a
timing Ublox (or even an old Motorola style timing receiver).
Am I missing something?
In a word, availability. Try buying a NEO-6T in quantity of less than a
reel (hundreds of pieces), for less than $180 (cost of a sample direct
from u-blox). NEO-6M can be bought in small quantities on the grey
market, for example aliexpress has dozens of such vendors. You also have
many choices of evaluation board if you don't want the raw module.
Good positioning modules like NEO-6M are more than sufficient for less
demanding applications like NTP, and even have some timing features like
sawtooth correction. It also has a "stationary" mode that isn't really
position hold but at least tunes the algorithm to assume the antenna
usually isn't moving.
Also is the (up to) 10MHz output from a 6T as useful as it seems it
should be given ~30/15ns quoted accuracy?
Not sure but I suspect you wouldn't want to use it directly. Locking a
OCXO to it would be trivial.
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