Welcome!

To learn about CNS Systems' commercial products see our other Web site at www.cnssys.com. There you will find information on:

	CNS Clocks
	IRIG Time Code Generator
	Tac32, Tac32Plus and Tac32Multi software
	GPS antennas and coax cable
	and much more ...

Fun

Do you remember Nixie tube displays.  Click here to see your computer's time displayed on Nixie Tubes.

GPS Publications:

Low-cost, High Accuracy GPS Timing presented at the Institute of Navigation's GPS 2000 Conference, September 20, 2000 by Dr. Thomas A. Clark, NASA Goddard Space Flight Center, Greenbelt MD, Richard M. Hambly, CNS Systems Inc., Severna Park MD, and Reza Abtahi, CNST, San Jose CA.
Get a copy of the paper here (requires Adobe Acrobat Version 5 or newer).
Right click to download the viewgraph presentation here (This file is over 6Mb).

Timing for VLBI presented at the International VLBI Service for Geodesy and Astrometry (IVS) Technical Operations Workshop (TOW) meeting on March 12, 2001 at Haystack Observatory by Dr. Thomas A. Clark, NASA Goddard Space Flight Center, Greenbelt MD.
Right click to download the viewgraph presentation here (This file is over 11Mb and requires Adobe Acrobat Version 5 or newer).

Critical Evaluation of the Motorola M12+ GPS Timing Receiver vs. the Master Clock at the United States Naval Observatory, Washington DC. presented at the 34th Annual Precise Time and Time Interval (PTTI) Systems and Applications Meeting on December 3, 2002 at the Hyatt Regency, Reston VA by Richard M. Hambly, CNS Systems, Inc.
Get a copy of the paper here (requires Adobe Acrobat Version 5 or newer).
Right click to download the viewgraph presentation here (This file is over 8Mb and requires Adobe Acrobat Version 5 or newer).

Timing for VLBI (updated 2003) presented at the International VLBI Service for Geodesy and Astrometry (IVS) Technical Operations Workshop (TOW) meeting on September 21-24 2003 at Haystack Observatory by Dr. Thomas A. Clark, NASA Goddard Space Flight Center, Greenbelt MD and Richard M. Hambly, CNS Systems, Inc.
Right click to download the viewgraph presentation here (This file is over 14Mb and requires Microsoft Powerpoint Version 2003 or newer).

Timing for VLBI (updated 2005) presented at the International VLBI Service for Geodesy and Astrometry (IVS) Technical Operations Workshop (TOW) meeting on May 9-12 2005 at Haystack Observatory by Dr. Thomas A. Clark, NASA Goddard Space Flight Center, Greenbelt MD and Richard M. Hambly, CNS Systems, Inc.
Right click to download the viewgraph presentation here (This file is over 14Mb and requires Microsoft Powerpoint Version 2003 or newer).

Timing for VLBI (updated 2007) presented at the International VLBI Service for Geodesy and Astrometry (IVS) Technical Operations Workshop (TOW) meeting on April 30 - May 3, 2007 at Haystack Observatory by Dr. Thomas A. Clark, NASA Goddard Space Flight Center, Greenbelt MD.
Right click to download the viewgraph presentation here (This file is over 9Mb and requires Microsoft Powerpoint Version 2003 or newer).

Improving the Performance of Low Cost GPS Timing Receivers presented at the 38th Annual Precise Time and Time Interval (PTTI) Systems and Applications Meeting on December 7, 2006 at the Hyatt Regency, Reston VA by Dr. Thomas A. Clark, NASA Goddard Space Flight Center (retired), and Richard M. Hambly, CNS Systems, Inc.
Right click to download the viewgraph presentation here (This file is over 33Mb and requires Microsoft Powerpoint Version 2003 or newer).
Click here to download a shorter PDF version of the presentation. (This file about 2.5Mb and requires Adobe Acrobat Version 6 or newer).

Classic HP Application Notes
GPS and Precision Timing Applications, Application Note 1272 (420Kb)
The Science of Timekeeping, Application Note 1289 (1.2Mb).

What's all this VLBI stuff, anyway? presented at the International VLBI Service for Geodesy and Astrometry (IVS) Technical Operations Workshop (TOW) meeting on April 30 - May 3, 2007 at Haystack Observatory by Dr. Thomas A. Clark, NASA Goddard Space Flight Center, Greenbelt MD.
Right click to download the viewgraph presentation here (This file is over 5Mb and requires Microsoft Powerpoint Version 2003 or newer).

Other Important Publications:

Quartz Crystal Resonators and Oscillators For Frequency Control and Timing Applications - A Tutorial by John R. Vig, January 2007.
(This file is over 8Mb and requires Microsoft Powerpoint).

AMSAT Publications:

AMSAT OSCAR-E, A New LEO Satellite from AMSAT-NA by Richard M. Hambly, W2GPS as published in the AMSAT Journal, Volume 25, No. 3, May/June 2002 and in CQ/VHF Magazine, Summer 2002.
Get a copy of the paper here (requires Adobe Acrobat Version 5 or newer).
Right click to download the viewgraph presentation here (828Kb). This is the presentation given at the Maryland-DC area AMSAT Meeting and Space Seminar, Sunday, May 5, 2002, at NASA Goddard Space Flight Center, Greenbelt MD.
Get a copy of the viewgraph presentation here (440Kb). This is the presentation given at the AMSAT Forum. Hamvention 2002, Saturday, May 18, 2002, HARA Arena Complex, Room 1, Dayton OH.

AMSAT OSCAR-E Project Status Update, A New LEO Satellite from AMSAT-NA by Richard M. Hambly, W2GPS as published in the AMSAT Journal, Volume 25, No. 7, Nov/Dec 2002 and in CQ/VHF Magazine, Winter 2002.
Get a copy of the paper here (requires Adobe Acrobat Version 5 or newer).
Get a copy of the viewgraph presentation here (836Kb). This is the presentation given at the 20th Space Symposium and AMSAT-NA Annual Meeting, Saturday, November 9, 2002, at the Lockheed Martin Recreation Area (LMRA), Fort Worth TX.

Microsat Design, What Do People Want? by Richard M. Hambly, W2GPS as published in the AMSAT Journal, Volume 25, No. 7, Nov/Dec 2002.
Get a copy of the paper here (requires Adobe Acrobat Version 5 or newer).
Right click to download the viewgraph presentation here (414Kb). This is the presentation given at the 20th Space Symposium and AMSAT-NA Annual Meeting, Saturday, November 9, 2002, at the Lockheed Martin Recreation Area (LMRA), Fort Worth TX.

AMSAT OSCAR-E Project, Summer 2003 Status Update by Richard M. Hambly, W2GPS as published in the AMSAT Journal, Volume 26, No. 4, Jul/Aug 2003 and in CQ/VHF Magazine, Summer 2003.
Get a copy of the paper here (requires Adobe Acrobat Version 5 or newer).
Right click to download the viewgraph presentation here (1.3Mb). This is the presentation given at the AMSAT Forum, Dayton Hamvention 2003 on Saturday, May 17, 2003, at HARA Arena Complex, Room 1, Dayton, Ohio.

AMSAT OSCAR-E Project, Fall 2003 Status Update by Richard M. Hambly, W2GPS as published in the Proceedings of the AMSAT-NA 21st Space Symposium, November 2003, Toronto, Ontario, Canada.
Get a copy of the paper here (requires Adobe Acrobat Version 5 or newer).
Right click to download the viewgraph presentation here (1.8Mb).

C-C RIDER, A New Concept for Amateur Satellites by Tom Clark, W3IWI as published in the Proceedings of the AMSAT-NA 21st Space Symposium, November 2003, Toronto, Ontario, Canada.
Get a copy of the paper here (requires Adobe Acrobat Version 5 or newer).
Right click to download the viewgraph presentation here (608Kb).

C-C Rider Revisited by Tom Clark (W3IWI), Bob McGwier (N4HY), Phil Karn (KA9Q) and Rick Hambly (W2GPS) as published in the Proceedings of the AMSAT-NA 22nd Space Symposium, October 2004, Arlington, Virhginia.
Get a copy of the paper here (requires Adobe Acrobat Version 6 or newer).
Right click to download the viewgraph presentation here (732Kb).

Eagle Software Defined Transponder Milestone On Tuesday, August 16, 2005 Tom Clark W3IWI, Rick Hambly W2GPS, and Bob McGwier N4HY (left to right in this picture ) made the first ever live contacts via the prototype Eagle satellite Software Defined Transponder (SDT). The SDT software was written by Frank Brickle AB2KT, and Bob McGwier N4HY. The transponder was set up in Rick's lab (shown) and the contacts were made from Rick's Ham shack, completely independent of the lab. Hear the historic contact (1.7Mb mp3 file).

Software Defined Transponders, Future AMSAT Missions: Phase 3E and Eagle by Tom Clark (K3IO, ex W3IWI) and Bob McGwier (N4HY) as presented at the 10th Annual SVHFS Technical Conference in Greenville SC, April 28 & 29, 2006
Get a copy of the paper here (requires Adobe Acrobat Version 6 or newer).

AMSAT North America, A Status Report by Richard M. Hambly W2GPS, AMSAT President, as presented at various conferences in the Spring of 2006, most recently at AMSAT-DC Meeting and Space Seminar, April 8, 2006, Historical Electronics Museum, 1745 West Nursery Road, Linthicum MD 21090 Get a copy of the PowerPoint presentation here.