[time-nuts] Surplus uBlox LEA-4T modules

[Gregory Beat]

A Search at eBay or a general Google search on the Internet
will reveal a number of older GPS modules used for timing (used & new)

A recent eBay search revealed a group of five (5) uBlox-4T modules for $24 (free ship).
eBay Auction number: 203426846312

uBlox LEA-4x series GPS receiver Data Sheet
https://www.mikrocontroller.net/attachment/26089/LEA-4x_Data_Sheet_GPS.G4-MS4-06143_.pdf

The LEA-4T is a 16-channel ANTARIS®4 positioning engine released in 2007.
http://datasheet.buhieen.net/LEA-4T.pdf

The LEA-4T supports precision GPS timing and raw measure- ment data for demanding positioning applications. It features a Time Mode function whereby the GPS receiver assumes a stationary 3D position, whether programmed manually or de- termined by an initial self-survey. Stationary operation enables GPS timing with only one visible satellite and eliminates timing errors which otherwise result from positioning errors. The accuracy of the time pulse is as good as 50 ns, synchronized to GPS or UTC time. An accuracy of 15 ns is achievable by using the quantization error information to compensate the granu- larity of the time pulse. The built-in 2-channel time mark and counter unit provides precise time measurement of external interrupt signals.