Green Bay Professional Packet Radio

Green Bay Professional Packet Radio (GBPPR) is our attempt at an advanced amateur radio and electronics research team.

Based in Green Bay, Wisconsin, we have banded together several small groups of the world's most specialized hackers who strive for the advancement of technology in order to help all of mankind.

Each group specializes in a certain task or skill, pushing the very edges of science and technology as we know it.

GBPPR Working Groups
  • GBPPR Radiation Laboratory (GRL):  Investigates and uses the sciences of electrodynamics and electromagnetic field theory, while innovating the HP way.
  • Advanced Development Projects (ADP):  Cutting-edge, high-tech, open-source hardware and software projects.  Making the impossible, possible... maybe.
  • Tailored Access Operations (TAO):  Consists of a small band of highly-motivated, undocumented telecommunication and computer network exploration enthusiasts whom specialize in the extraction of data from denied-access targets.
  • Special Collection Service (SCS):  Clandestine interception and monitoring of intelligence over the known ranges of optical, radio, and acoustic wavelengths.
  • Special Operations Groups (SOG):  Undocumented research and information gathering team utilizing advanced non-destructive entry methods.  Also capable of performing covert, artificially-induced term limits and impeachments.
  • Total Information Awareness (TIA):  Collects, scans, records, documents, and releases as much technical information (past & present) as possible.
  • Advanced Weapons Engineering (AWE):  Designing and building advanced electronic, electrodynamic and psychotronic weapons for our future militias.
  • Applied Physics Laboratory (APL):  Educating the public and making your homework easier, performing unlicensed nuclear accelerator experiments, and operating the Small Fermion Collider.
  • Pulsed-Power Group (PPG):  High-voltage pulse, electromagnetic pulse, and high-power RF experiments.
  • Missiles and Aerospace Systems (MAS):  Unmanned aerial vehicles, advanced aerospace threat monitoring (and making!), both identified and unidentified flying object research, and deploying really, really low-Earth orbit objects.
  • Technical Assistance Program (TAP):  24-hour Scientific Services and Answer Center.

"They can do all because they think they can."
    --- Virgil, Aeneid

Operational support branches also include media releases via the GBPPR Vision series of videos on YouTube, our own technical journal GBPPR 'Zine in electronic media (PDF) format, and even an occasional low-power FM radio broadcast.

"Man who say it cannot be done should not interrupt man doing it."

Amateur Radio Projects

Other Projects

Local Terrain & RF Plots

"Leave the beaten path and dive into the woods.
You are certain to find something interesting."

Interactive Wireless / RF Design Utilities

GBPPR Microwave Radio Path Analysis Tools

A Perl CGI program to graphically show the radio path profile between two points.  It will plot the 0.6 Fresnel zone and the true radio path for a given value of K (the effective Earth radius factor).  This is all displayed in reference to the path's elevation data taken at intervals along the link path.  This will let you see if you have a clear radio line-of-sight path.  Currently, the elevation data is only available for most of North America.  It is also extremely CPU intensive, so please be patient for the output PDF file to complete, or try again at a different time.

Temporarily down as they require an enormous amount of resources, and I can't get my modified SPLAT! to work under modern Linux systems.  :(

GBPPR Microwave Radio Path Analysis Tools  Source code for the above scripts.  (758k TGZ)

All the plotting utilities are based around a slightly modified version of the SPLAT! program by KD2BD.

Here is a complete 520 MB TGZ file (file list) of converted SPLAT! Data Files (SDF) for SPLAT! v1.1.1 and later versions.  This is the STRM-3 v2.1 topographical data (North America only) which was available at:

Here is an Entry for a 1 GB TGZ file (file list) of the USGS DEM250 data which was orignally available at:

Here is an Entry for a 7 GB TGZ file (file list) of the STRM-1 v2.1 topographical data (North America regions) which was available at:

Here is an Entry for a 14.7 GB TGZ file (file list) of the SRTM-3 v2.1 topographical data (world wide) which was available at:

Here is an Entry for a 16.5 GB TGZ file (file list) of the SRTM-3 v3.0 topographical data (world wide - no registration) which is available at:

Here is an Entry for a 16.5 GB TGZ file (file list) of SRTM-3 v2.1 topographical data (world wide) which as already been converted for use with SPLAT! via the srtm2sdf command.

Here are the County Subdivisions cartographic boundary files from the U.S. Census Bureau for the year 2000.  These files contain the names, locations, and boundaries of cities, and smaller towns, townships, and boroughs for display on SPLAT!-generated maps.

Here are the Incorporated Places/Census Designated Places cartographic boundary files from the U.S. Census Bureau for the year 2000.  These contain city/site data files which can be imported into SPLAT!-generated maps.

SRTM v2.1 Documentation

RF and Microwave Communications Research Links

RF/Electronics Design Notes & Links

GBPPR Technical Bulletins

Various Amateur Radio Technical Papers

Various TAPR Digital Communications Conference Speeches

Microwave Associates (M/A-Com) Gunnplexer Notes

10 GHz Path Loss Notes

MMDS Downconverter Notes & Applications

Archived Down East Microwave Inc. Design & Library Notes

Radar & Military Communications

Communication is the key to success.

Recommended Hardware & Parts Suppliers

GBPPR Contact Information

"The best way to predict the future is to invent it."