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Green Bay Professional Packet Radio

Green Bay Professional Packet Radio is our attempt at an advanced wireless communication research team.  Based in Green Bay, Wisconsin, we have banded together a small group of specialized residents who strive for the advancement of modern forms of electromagnetic wave communication.  We specialize in high-speed wireless data (packet), digital voice transmissions, ELINT/EW/ECM, radar, antenna design, bi-phase modulation and also the hardware/software side of all those types of communication.

We are die-hard radio homebrewers and experimenters.  While other people are drooling on nothing more than glorified ice cream truck 2-way radios, we are out using new and efficient modulation techniques and pioneering new developments in modern radio.  We've also homebrewed microwave radio bi-directional amplifiers for the local packet radio links, circular polarized repeater antennas, high quality audio hardware and all types of RF test equipment.

Modeled from the concepts originated by Clarence 'Kelly' Johnson (of Lockheed Martin Skunk Works fame), we attempt to push the boundaries of modern radio and antenna technology.  Using common off-the-shelf components, old VCRs, cellular phones, lots of trips to Radio Shack and, of course, well established theory.  We will always forge on.  Building and testing new designs while quietly ignoring anyone who tells us something is not possible.

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

Amateur Radio Projects

  1. Low-Cost Wireless Network How-To
  • Extremely detailed account of a Part 97 point-to-point 2.4 GHz wireless link.

Using Part 15 Wireless Ethernet Devices for Amateur Radio
  • Hints, tips and rules for using off-the-shelf hardware for amateur radio Part 97 operations.

KB9MWR Projects Page
  • Ongoing local amateur radio projects.

Mirror of the Website
  • Mirror site of the L0pht spin-off project.  Few minor broken links.

Low-Cost POCSAG Paging Network How-To
  • Homebrew your own amateur radio text or tone paging system.

Low-Cost Laser Data Links
  • Quit shining laser pointers at people and use them for something useful.

Homebrew RF Design Test Equipment & Software
  • Simple and useful tools for the RF experimenter.

Homebrew Bi-Directional 2.4 GHz Amplifier Designs
  • Make your own amplifier for your 2.4 GHz wireless network.

Homebrew Bi-Directional 915 MHz Amplifier Designs
  • Make your own high-power amplifier for your 900 MHz wireless network.

Homebrew 1 Watt 2.4 GHz Power Amplifier
  • Increase the RF output power of your wireless network card to 1 Watt.

Homebrew 144 MHz to 2.4 GHz Transverter
  • Scan and monitor the 2.4 GHz band using a common MMDS downconverter.

GBPPR Frequency Transverters for 2.4 GHz Wireless LAN Devices
  • Change the frequency of your amateur radio 2.4 GHz network to overcome interference or line-of-sight issues.

Family Radio Service (FRS) to 900 MHz Transverter
  • I was really bored.  (Unfinished)

  • Keys a transmitter and plays a pre-recorded message at one minute intervals.

GBPPR 2.4 GHz / 10 Mbit Wireless Data Link
  • Why buy a wireless network card when you can tear your hair out trying to build one?

GBPPR POWER 64 kbps Wireless Serial Data Modem
  • Experimental ideas for a low-speed, interference overcoming wireless data link.

GBPPR 900 MHz High-Speed Packet Radio
  • Experimental ideas for a high-speed, interference overcoming wireless data link.

Elecraft EC1 Design Contest Entry
  • It was a winner.

GBPPR 1 GHz RF Spectrum Analyzer
  • Homebrew the most useful tool for a RF experimenter, work in progress.

Constructing Scotty Sprowls' 1 GHz RF Spectrum Analyzer
  • This is a series of notes and videos on constructing the 1 GHz RF spectrum analyzer project by Scotty Sprowls.

Tracking Generator for a HP8569 Spectrum Analyzer
  • Construction overview of a low-cost tracking generator for a HP8569-series spectrum analyzer.

Dataradio Gemini G3 UHF Radio Modem Experiments
  • Information and experimental ideas for the Dataradio Gemini G3 UHF radio modem.

GBPPR 1 kHz to 16.384 MHz Synthesized Signal Generator
  • Simple PLL signal generator for the test bench using a common Maxim IC.

GBPPR Divide-by-1000 3.5 GHz Prescaler

GBPPR Packet Radio Weather Radio Alert
  • Use the National Weather Service's alert tone to send a packet radio message.

GBPPR Portable Antenna Mast System
  • Portable antenna mast system using PVC conduit.

GBPPR 900 MHz Frequency Hopping Spread Spectrum Transverter
  • Frequency hopping transverter for amateur radio use.

GBPPR Portable 28 VDC Power Supply
  • Simple and portable 28 Volt power supply.

GBPPR 1.2 GHz (23 cm) Amateur Video Transmitter
  • Simple 1.2 GHz FM ATV exciter.

Converting Cellular Phones to 900 MHz
  • Use old Motorola cellular phones as IF rigs in a 900 MHz transmitter.

Simple 2.4 GHz SWR Meter
  • Simple way to tune wireless LAN antennas using an oscilloscope.

Linux FRS Radio Control
  • Easily control a FRS/GMRS radio from a computer.

Return Loss Bridge for the Radio Amateur
  • Device to quickly check the integrity of a radio antenna system.

Using the MC145158 PLL Frequency Synthesizer
  • Simple overview and source code for the Motorola MC145158.

AeroComm CL4490 Experiments
  • Wireless data networking experiments using AeroComm modules and data modems.

Metricom Ricochet Radio Experimentation
  • Experiments using components from old Metricom 900 MHz and 2.4 GHz RF data modems.

100 Watt RF Power Amplifier for 2 GHz
  • Turn an old 1.9 GHz PCS cellular phone basestation into a RF power amplifier.

Qualcomm OmniTRACS Experiments
  • Using Qualcomm OmniTRACS fleet tracking satellite systems for amateur radio applications.

General Electric GEMLINK Information
  • Overview of a General Electric GEMLINK K-band video transmitter.

Motorola STF2520A 900 MHz Power Amplifier Modifications
  • Modifying a surplus Motorola STF2520A cellular-band RF amplifier for 150 watts in the 900 MHz ham band.

73 Magazine Information
  • An attempt at a complete back issue and index listing for 73 Magazine.

Doodle Labs DL435-30 420-450 MHz OFDM Transceiver Experiments
  • Experimenting with high-speec data in the 440 MHz ham band.

GBPPR VLF Converter
  • Homebrew version Marty Kaiser's VLF59-10 5 to 500 kHz VLF converter.

HP4328A Milliohmmeter Overview & Probe Construction
  • General overview of the HP4328A operation and how to make your own Kelvin bridge probes.

Other Projects

  1. GBPPR Miscellaneous Projecmts      (Mirror)
  • Other stuff you can blame us for.

GBPPR Homebrew Military & Espionage Electronics      (Mirror)
  • Electronic projects for professional adventurers, independent contractors, and undocumented border patrol agents.

Brown County, Wisconsin Frequency Search
  • Frequency search of local frequencies, PL-tones, DTMF codes, repeater offsets, notes, etc.

Green Bay / Brown County, Wisconsin 800 MHz Trunked Radio System Information

GBPPR Microwave Oven & EMP Experiments      (Mirror)
  • EME, remote power via RF, radar, landmine detection, HERF, EMP, etc.

GBPPR Homebrew Radar Experiments      (Mirror)
  • FMCW/doppler & pulse-doppler types, battlefield & air surveillance using old parts from motion detectors and microwave ovens.

Passive Resonant Cavity & "Spycatcher" Technical Surveillance Devices
  • Technical overview of the passive surveillance bug the Soviets used against the U.S. ambassador.

  • The monthly journal of the American hacker.

Low-Power FM Transmitter Circuits
  • Help fight the liberal media.  Build a low-power FM or TV station.

Test Equipment Manuals
  • Small collection of old test equipment operating and service manuals.

Obama FAIL!
  • Helping to organizing communities to protect yourself from the Community Organizer.

GBPPR Parts Service
  • Parts available for the experimenter for trade or swap.

GBPPR Vision
  • Video series aimed at experimenters and hackers covering topics related to amateur radio, homebrew electronics, test equipment, etc.

Local Terrain & RF Plots

  1. Elevation Plot for Green Bay, Wisconsin and the Surrounding Area
  • Lowest elevation is 174 meters, highest is 274 meters.  Plot is 22.5 km square and the contour lines are at 10 meter intervals.

Zoomed Out Elevation Plot for Green Bay, Wisconsin and the Surrounding Area
  • Lowest elevation is 176 meters, highest is 300 meters.  Plot is 50 km square and the contour lines are at 10 meter intervals.

Elevation Plot for the Northeast Wisconsin Area
  • Lowest elevation is 176 meters, highest is 340 meters.  Plot is 100 km square and the contour lines are at 10 meter intervals.

Larger Elevation Plot for the Northeast Wisconsin Area
  • Lowest elevation is 176 meters, highest is 579 meters.  Plot is 250 km square and the contour lines are at 10 meter intervals.

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

Interactive Wireless / RF Design Utilities

  1. Wireless Network Link Analysis
  • Calculates approximate received power levels and fade margins for microwave wireless links.

Wireless Network Link Analysis - Super Edition    (Mirror)
  • Same as above, but generates a PDF file containing Fresnel zone and radio path graphs.

Microwave Radio Path Analysis    (Mirror)
  • Generates a terrain profile graph and obstruction reports for a microwave radio link between two points.

Line-of-Sight Path Analysis    (Mirror)
  • Generates a JPEG image showing the line-of-sight path for a given transmitter location.

Longley-Rice Path Loss Analysis    (Mirror)
  • Generates a JPEG image showing the estimated Longley-Rice path loss for a given transmitter location.

Fresnel Zone Calculator    (Mirror)
  • Calculates and graphs the required Fresnel zone clearances for a point-to-point link.

United States Elevation Retriever    (Mirror)
  • Get the ground elevation at (almost) any location in the continental United States.

3D Local Ground Elevation Map    (Mirror)
  • Get a graphic 3D representation of the local ground elevations surrounding a transmitter site.

Parabolic Reflector Gain and Focal Point Calculator
  • Calculates the gain, focal point, and radiation distances for parabolic dishes.

Urban Area Path Loss
  • Calculates the approximate path loss through an urban area.

Antenna Up/Down Tilt Calculator
  • Calculates the required antenna tilt to compensate for Earth curvature.

Distance & Bearing Calculator
  • Calculates the distance and bearing between two geographic points.

Omnidirectional Antenna Beamwidth Analysis
  • Estimates the coverage of a vertical antenna pattern.

Return Loss Calculator
  • Calculates return loss given forward/reverse power or SWR.

Knife Edge Diffraction Loss Calculator
  • Calculates knife edge obstruction attenuation.

Decibel Conversion Calculator
  • Converts various values referenced to/from decibels.

Scattering Parameters Are Fun!
  • Calculates gamma in/out from S-parameters, experimental.

Lumped Component Wilkinson Splitter / Combiner Designer
  • Design Wilkinson splitters/combiners for use under 400 MHz.

Pi & Tee Network Resistive Attenuation Calculator
  • Design resistive attenuators.

United States Frequency Allocations 30 - 3000 MHz
  • Retrieve the FCC band allocation for any frequency.

Voltage To Power Conversion Calculator
  • Convert AC voltages to power.

RF Safety Compliance Calculator
  • Determines if your ERP will kill people.

Approximate Air Coil Inductance Calculator
  • Calculates the approximate value of an air coil inductor.

Microstripline Analysis & Design
  • Calculates the required width for making microstrip transmission lines.

Calculating Phase Line Length
  • Calculates coaxial phase line lengths.

3-Pole Butterworth Characteristic Bandpass Filter Calculator

RF Pi Network Designer
  • Designs Pi-type networks for transforming impedances.

PLL 3rd Order Passive Loop Filter Calculator
  • Designs passive loop filters for phase lock loops.

Antenna Isolation Calculator
  • Calculates isolation for horizontal & vertical antennas.

Mixer IMD Calculator
  • Calculates potential IMD products in subtractive mode mixers.
Perl CGI Sources for the Wireless Design Utilities: wireless.tar.gzPerl CGI Sources for the RF Design Utilities: rf_design.tar.gzMirror website for the Wireless 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.

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

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

Advanced Wireless Communications Research Links

Fractal Antennas / Fractal Geometry

If you think stringing wire between two trees is an antenna, you can skip this section.

RF Design Notes & Links

GBPPR - Facts Not Drivel

GBPPR Technical Bulletins

GBPPR Open Hardware License

FCC Compliance

Part 97.309 & 97.311 compliance specifiations and source codes to the programs used in our amateur radio networks.

Don't be stupid.

Passwords on all amateur radio nodes are either the user's callsign or disabled.

  • gzip  Compresses and Decompresses Files
  • mod_gzip  For Apache Web Servers
  • OpenSSH  OpenSSH is used in compression mode only
  • Brutalcopy  Pushes data using UDP protocol through rotten, overloaded and otherwise disgusting lines
  • Vtun  The easiest way to create Virtual Tunnels over TCP/IP networks with traffic shaping, compression and encryption
  • Amateur Radio ID'ing via ICMP Echo Request Packets  ID using ping packets and MAC manipulation.

Toward New Link-Layer Protocols for Amateur Packet Radio

Spread Spectrum Rule Recommendations

Ideas for HF Modulation and Coding

Proposed Coded AO-40 Telemetry Format

Amateur Radio, Wireless Networks and the Information Age

Physical Layer Considerations in Building a High-Speed Amateur Radio Network

A Technological Rationale to Use Higher Wireless Frequencies

A Mathematical Theory of Communication

An Overview of the Application of CDMA to Digital Cellular Systems and Personal Cellular Networks

A Method of Reducing Disturbances in Radio Signaling by a System of Frequency Modulation

Shannon, Coding and the Radio Amateur

TAPR Packet Status Register Archives

The Shape of Bits to Come

Various TAPR Digital Communications Conference Speeches

Microwave Associates (M/A-Com) Gunnplexer Notes

10 GHz Path Loss Notes

  1. Free Space Attenuation
  2. Path Performance Calculations for 15 kHz IF Bandwidth
  3. Distance vs. Carrier-to-Noise Ratio
  4. Microwave Beams Behave Much Like Light Beams
  5. Fresnel Zone Radius
  6. K Factors
  7. Surface Ducting
  8. Elevated Duct

MMDS Downconverter Notes & Applications

Archived Down East Microwave Inc. Design & Library Notes

Amateur Radio Repeater Notes

Radar & Military Communications

Communication is the key to success.

Hardware & Parts Suppliers

GBPPR Contact Information

List of website Recent Changes.

Also be sure to subscribe to the GBPPR Low-Cost Wireless Networks Mailing List

The mailing list covers wireless networking, homebrew electronic projects, amateur radio projects, scanning radio projects, antennas, computers and everything else covered on this website.

You'll have to subscribe to the mailing list to get your replies.  Be sure to read the archives first!

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



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