Compact GPS Satellite Controlled Nixie Tube Clock kit (GPSII)

200mm L x 80mm H; GPSII was designed to compliment a desk in your residence. The six 15mm digit Nixie Tubes are easily visible from a distance too.
GPSII is controlled by an integrated GPS satellite receiver module,  decoding transmissions from 28 US government defense satellites orbiting our planet.
The NAVigation Satellite Timing and Ranging (NAVSTAR) system was developed to meet the military needs of the United States Department of Defense.
The extraordinary ranging accuracy of GPS is the result of an ultra-stable cesium clock reference transmitted by the ground based segments of NAVSTAR.
GPSII takes advantage of the NAVSTAR precision timekeeping system to deliver a clock with   "beyond question"  accuracy.   There are no other satellite 
controlled clocks offering a comparable level of performance, and embedded features at a hobby kit price.    GPSII uses a Direct Drive Nixie Tube display. 
No multiplexing was used.  Although more complex; Direct Drive offers the distinct advantages of a brighter digit display, and extended (10+ yr)  tube life.
This clock was developed as a partnering project with John Miktuk.   An engineering team approach will always deliver a superior product to the customer.

GPSII front

GPSII will remain accurate to within a fraction of a second of the GPS Satellite transmission.    Far superior to local oscillator and AC line referenced clocks.
Local Time,  Date,  Latitude / Longitude coordinates,  and the temperature can be configured to scroll across the display at intervals of: 1, 15, 30, 60 minutes.
Time can be displayed in 12 or 24 hour format.  For 12 hour format: a PM indicator is located at the lower left of the display.  Date can be displayed in either
mm,dd,yy  OR  dd,mm,yy format.   The temperature can be displayed in degrees F or degrees C with quarter degree precision.   A  pleasing soft chime tone
can be enabled to strike at selected intervals, and a choice of chime styles are provided.  The scrolling speed can be varied from slow to -fast in a range of ten
individual steps.  And, each of the features can be separately disabled from the periodic scrolling cycle.   The colon indicators separating the paired digits can
vary their configuration to upper, lower, or independent. This determines whether the Time, Date, Coordinates or  Temperature are currently being displayed.

GPSII receives the satellite transmissions using a compact "puck" style 1.5Ghz antenna. Some locations may provide adequate satellite reception inside of a
structure, whereas others will require an externally mounted antenna.  The antenna is weatherproof, and includes a 20' coaxial lead in for external mounting.

GPSII incorporates a unique method of operation in areas with "spotty" reception due to limited antenna mounting considerations; a secondary time source!
In the event of satellite signal loss after successful startup; GPSII will continue operation using the high precision 1pps signal pulse from the GPS receiver.
The lower right colon lamp will extinguish to indicate the clock is operating from the local precision, then relight when the satellite signal has been restored.
If power is lost, a lithium battery will maintain GPS receiver ephemeris, and quickly resume operation when power is restored.   No typical cold start TTFF
(Time To First Fix) delay is incurred when NixiSat is re powered.    The initial startup acquire after installation may take 10-30 minutes, location dependent.

The symmetrical component layout attracts your eyes to the electronics inside. Two PCB's arranged in an "L" contain all the electronics for GPSII.
The vertical PCB supports the MCU, regulated supply , and the GPS satellite receiver module. The horizontal PCB supports a high voltage power 
supply, display control,  and the Nixie Tubes.   GPSII operates from a compact 12vdc wall power adapter, accepting 90-260VAC from 47-63 Hz.

Click here to download the GPSII Operation manual in .PDF format.


The GPSII kit contains everything to build the clock shown in the image above.
All components, Enclosure, Nixies, everything is included.

You have a choice of clear envelope nixie tubes, or orange tinted nixie tubes.
Normally, the clear envelope nixie tubes are included in the kit.

The GPS receiver and antenna may vary from the type shown in the image at right.

<>Detailed assembly instructions are provided in the kit, and will help to speed the 
assembly time of your GPSII clock.  

When someone asks you what time it is; you can tell them this clock is accurate to
within a fraction of a second of the national time standard.
gpsii kit

Price as a complete kit of all parts: $249.00 USD + shipping

Payment can be made by Visa / Mastercard or Paypal. Don't hesitate!, order yours today. 

Any questions?, please email. or call. Thank you.

Jeff Thomas

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This page was last
updated 06/10/10