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 and PL-259 connectors, 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 boundries 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.

Some schematics are in their native Xcircuit PostScript format for ease of printing and modification.  To use PostScript under Window$, you'll need to install the Ghostscript & Ghostview packages.  Set Media to A2 for proper of viewing.

Mirror available at www.wireless-homebrew.com

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

-- Old Chinese Proverb

Amateur Radio Projects

1. Low Cost Wireless Network How-To  (Mirror)
• Extremely detailed account of a Part 97 point-to-point 2.4 GHz wireless link.
2. 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.
3. Low Cost POCSAG Paging Network How-To  (Mirror)
• Homebrew your own amateur radio text or tone paging system.
4. Low Cost Laser Data Links  (Mirror)
• Quit shining laser pointers at people and use them for something useful.
5. Homebrew RF Design Test Equipment & Software  (Mirror)
• Simple and useful tools for the RF experimenter.
6. Homebrew Bi-Directional 2.4 GHz Amplifier Designs  (Mirror)
• Make your own amplifier for your 2.4 GHz wireless network.
7. Homebrew Bi-Directional 915 MHz Amplifier Designs  (Mirror)
• Make your own high-power amplifier for your 900 MHz wireless network.
8. Homebrew 1 Watt 2.4 GHz Power Amplifier  (Mirror)
• Increase the RF output power of your wireless network card to 1 Watt.
9. Homebrew 144 MHz to 2.4 GHz Transverter
• Scan and monitor the 2.4 GHz band using a common MMDS downconverter.
10. 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.
11. Family Radio Service (FRS) to 900 MHz Transverter
• I was really bored.  (Unfinished)
12. GBPPR AutoFox
• Keys a transmitter and plays a pre-recorded message at one minute intervals.
13. GBPPR Tactical Communications Jammer
• Used to simulate the type of interference that may be experienced on radio communication links.
14. 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?
15. GBPPR POWER 64 kbps Wireless Serial Data Modem
• Experimental ideas for a low speed, interference overcoming wireless data link.
16. GBPPR 900 MHz High Speed Packet Radio
• Experimental ideas for a high speed, interference overcoming wireless data link.
17. Elecraft EC1 Design Contest Entry
• It was a winner.
18. GBPPR 0 - 1000 MHz Spectrum Analyzer / Tracking Generator / Scalar RF Network Analyzer
• Homebrew the most useful tool for a RF experimenter, work in progress.
19. GBPPR 1 kHz to 16.384 MHz Synthesized Signal Generator
• Simple PLL signal generator for the test bench using a common Maxim IC.
20. GBPPR Divide-by-1000 3.5 GHz Prescaler
• Extend the frequency range on those cheap hamfest frequency counters.
21. GBPPR Packet Radio Weather Radio Alert
• Use the National Weather Service's alert tone to send a packet radio message.
22. GBPPR Portable Antenna Mast System
• Portable antenna mast system using PVC conduit.
23. GBPPR 900 MHz Frequency Hopping Spread Spectrum Transverter
• Frequency hopping transverter for amateur radio use.
24. GBPPR Portable 28 VDC Power Supply
• Simple and portable 28 Volt power supply.
25. GBPPR 1.2 GHz (23 cm) Amateur Video Transmitter
• Simple 1.2 GHz FM ATV exciter.
26. Converting Cellular Phones to 900 MHz
• Use old Motorola cellular phones as IF rigs in a 900 MHz transmitter.
27. Simple 2.4 GHz SWR Meter
• Simple way to tune wireless LAN antennas using an oscilloscope.

Other Projects

1. GBPPR Parts Service
• An electronic parts trading service for amateur radio operators and electronics experimenters.
2. GBPPR Miscellaneous Projects  (Mirror)
• Other stuff you can blame us for.
3. GBPPR Homebrew Military & Espionage Electronics  (Mirror)
• Open Source Defense Electronics (OSDE).
4. Brown County, Wisconsin Frequency Search
• Frequency search of local frequencies, PL-tones, DTMF codes, repeater offsets, notes, etc.
5. Green Bay / Brown County, Wisconsin Trunked Radio System Information
• Detailed information on the local public service radio system.
6. Microwave Oven Magnetron Experiments  (Mirror)
• EME, remote power via RF, radar, under construction.
7. Homebrew Radar Experiments  (Mirror)
• FMCW/doppler & pulse-doppler types, battlefield & air surveillance using old motion detectors, under construction.
8. van Eck-style Radiation Interception Experiments  (Mirror)
• Re-create a computer monitor's screen by intercepting the radiation it emits.
9. Passive Resonant Cavity Bug  (Mirror)
• Technical overview of the passive surveillance bug the Soviets used against the U.S. ambassador.
10. Experimental Ideas for the Capture of Terrorists
• Experimental ideas on using electromagnetic waves to track terrorists.
11. GBPPR Non-Linear Junction Detector  (Mirror)
• Experimental idea for locating hidden electronics or even detecting suicide bomber belts.
12. Low Power FM Transmitter Circuits  (Mirror)
• Transmitter kits and schematics for the new LPFM stations.

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.
2. 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.
3. 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.
4. 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."

-- Alexander Graham Bell (1847 - 1922)

Interactive Wireless / RF Design Utilities

1. Wireless Network Link Analysis
• Calculates approximate received power levels and fade margins for microwave wireless links.
2. Wireless Network Link Analysis - Super Edition
• Same as above, but generates a PDF file containing Fresnel zone and radio path graphs. (Slow Host!)
3. Microwave Radio Path Analysis
• Generates a terrain profile graph and obstruction reports for a microwave radio link between two points. (Slow Host!)
4. Line-of-Sight Path Analysis
• Generates a JPEG image showing the line-of-sight path for a given transmitter location. (Slow Host!)
5. Longley-Rice Path Loss Analysis
• Generates a JPEG image showing the estimated Longley-Rice path loss for a given transmitter location. (Slow Host!)
6. Fresnel Zone Calculator
• Calculates and graphs the required Fresnel zone clearances for a point-to-point link. (Slow Host!)
7. United States Elevation Retriever
• Get the ground elevation at (almost) any location in the continental United States. (Slow Host!)
8. Parabolic Reflector Gain and Focal Point Calculator
• Calculates the gain, focal point, and radiation distances for parabolic dishes.
9. Urban Area Path Loss
• Calculates the approximate path loss through an urban area. (Slow Host!)
10. Antenna Up/Down Tilt Calculator
• Calculates the required antenna tilt to compensate for Earth curvature.
11. Distance & Bearing Calculator
• Calculates the distance and bearing between two geographic points.
12. Omnidirectional Antenna Beamwidth Analysis
• Estimates the coverage of a vertical antenna pattern.
13. Return Loss Calculator
• Calculates return loss given forward/reverse power or SWR.
14. Knife Edge Diffraction Loss Calculator
• Calculates knife edge obstruction attenuation.
15. Decibel Conversion Calculator
• Converts various values referenced to/from decibels.
16. Scattering Parameters Are Fun!
• Calculates gamma in/out from s-parameters, experimental.
17. Lumped Component Wilkinson Splitter / Combiner Designer
• Design Wilkinson splitters/combiners for use under 400 MHz.
18. Pi & Tee Network Resistive Attenuation Calculator
• Design resistive attenuators.
19. United States Frequency Allocations 30 - 3000 MHz
• Retrieve the FCC band allocation for any frequency.
20. Voltage To Power Conversion Calculator
• Convert AC voltages to power.
21. RF Safety Compliance Calculator
• Determines if your ERP will kill people.
22. Approximate Air Coil Inductance Calculator
• Calculates the approximate value of an air coil inductor.
23. Microstripline Analysis & Design
• Calculates the required width for making microstrip transmission lines.
24. Calculating Phase Line Length
• Calculates coaxial phase line lengths.
25. 3-Pole Butterworth Characteristic Bandpass Filter Calculator
• Designs simple 3-pole bandpass filters.
26. RF Pi Network Designer
• Designs Pi type networks for transforming impedances.
27. PLL 3rd Order Passive Loop Filter Calculator
• Designs passive loop filters for phase lock loops.
28. Antenna Isolation Calculator
• Calculates isolation for horizontal & vertical antennas.
29. Mixer IMD Calculator
• Calculates potential IMD products in subtractive mode mixers.

• Perl CGI Sources for the Wireless Design Utilities: wireless.tar.gz
• Perl CGI Sources for the RF Design Utilities: rf_design.tar.gz
• Mirror website for the Wireless Design Utilities.

Microwave Radio Path Analysis v1.21

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 the United States of 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.

Microwave Radio Path Analysis  Interactive CGI program

Also, try the Line-of-Sight Path Analysis and Longley-Rice Path Loss Analysis programs.  These are even slower and more CPU intensive!

All the plotting utilities are based around the SPLAT! program by KD2BD.

Microwave Radio Path/LOS Analysis, v1.21 source code.  (452k Gzipped TAR)

Advanced Wireless Communications Research Links

Hey!  Lets transmit sine waves!

• High Speed CSMA Digital Networking for HF
• The Utah T1-Rate Modem
• Optically Transparent Patch Antennas
• Weak Signal communications, by K1JT (WSJT)  A software package designed for amateur weak-signal radio communication at VHF
• Microstrip Patch Rectenna With High Output Voltage
• Philips RF Semiconductor Application Notes
• High Speed Networking Project
• Higher Speeds with the G3RUH 9600 Baud Packet Radio Modem
• The KD2BD 9600 Baud Modem
• 23cm High Speed Link Receiver from F1BIU
• 23cm Wide-Band FM Data-Transceiver
• International Information Retrieval Guild
• KE5FX's Homebrew 10 Mbit, 10 GHz Wireless Ethernet Project
• KE5FX Notes
• N6GN's Higher Speed Packet Web Pages
• DIY 10Mbps Optical Data Link
• DUAL - A Packet Format for a New Amateur Radio Link Layer
• The W1GHZ Online Microwave Antenna Book
• Microsemi Online PIN Diode Handbook
• Phil Karn, KA9Q
• Phil Karn's Comments to the FCC on Spread Specturm Communications
• The VMSK Delusion  Phil Karn rips apart VMSK/2
• Papers by Hari Balakrishnan  Wireless TCP/IP god.
• Lucent Technologies Wireless Research Laboratory
• Antenna Visualization
• Electrical Engineering Training Series
• Online Lectures about Digital Communication
• XTP Overview  Alternative transport protocol.
• Time Domain  New ultra wideband modulation techniques.
• Communication Devices Using Ultra-Wideband, Nonsinusoidal Communication Technology  Cool stuff.
• Æther Wire Notes and Documents
• Ultra-Wideband Working Group
• UltRa Lab at USC
• Plasma Antennas  Very cool.
• Unofficial NEC Archive  Antenna modeling software.
• Decentralized Channel Management in Scalable Multihop Spread-Spectrum Packet Radio Networks  (455k Gzipped PostScript)
• A Channel Access Scheme for Large Dense Packet Radio Networks  (350k PDF)
• Design and Implemenation of a Wire Array Antenna Analyzer  (150k PDF)
• High Power, Broadband, Linear, Solid-State Amplifier Design
• SIGSALY Secure Digital Voice Communications in World War II
• Slot Antenna Design by Stephen Bell, KB7TRZ
• A Transmission Line Calculator, Version 0.3, Kevin Schmidt, W9CF
• Some Skin Effect Notes
• Tale of the Radioactive Boy Scout
• Lots of Good Weak Signal RF Links
• GNU Radio Project
• Temporary Telecommunications Infrastructure in Lower Manhattan
• SP-419 SETI: The Search for Extraterrestrial Intelligence
• Low Cost Long Range Wireless Network How-To
• Chris's Wireless High-Speed Connect
• Another WAP11 enclosure
• BAWUG - Outdoor Access Point Encloseure v1
• Notes on G-lines (Goubau Transmission lines)

Fractal Antennas / Fractal Geometry

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

• Fractal Antennas  by KB7QHC
• Fractal Antenna Systems
• Fractus
• The Koch Curve and its Variants
• Fractal Antennas
• Good Fractal Antenna Overviews by Peter Song
• Fractal Antenna Research at UCLA
• Fractal Tutorials
• What is a Fractal?
• What is a Fractal? #2
• What is a Fractal? #3
• Fractal World
• Fractal FAQ
• A Fractals Lesson for Elementary and Middle School Students
• Fractal Dimension
• Recursion and Making a Koch Snowflake with Maple
• Triangle Grid Paper  Print it out, and use it to make triangles.
• Sierpinski Fractal Triangle PostScript Code
• Introduction to the Mandelbrot Set

RF Design Notes & Links

Little hints and tips we've used in projects.

• Circuit Sage  Excellent RF/analog circuit design website
• Fijitsu MB506 Divide-by-64/128/256 prescaler datasheet  (65k PDF)
• Microsemi UM9601 PIN diode datasheet  (470k PDF)
• NEC UPG152TA GaAs MMIC SPDT RF switch datasheet  (26k PDF)
• Application of PIN diodes  (258k PDF)
• Fast switching PIN diodes  (92k PDF)
• Applications for the HSMP-3890 surface mount switching PIN diode  (70k PDF)
• Intersil HFA3925 2.4 GHz power amplifier  Contains a good TX/RX switching idea (99k PDF)
• JavaScript Conjugate Match
• Scattering Parameters
• Class Notes
• Packet Radio Networks with Millions or Billions of Stations  Real Audio
• WA1RHP's Electronic Parts Inventory  Parts intended to support ham radio and electronic students
• Smith Chart Tools
• Microwave Group of San Diego Technical Articles and Projects
• American Technical Ceramics (ATC) technical notes
• Analog Computer Basics
• Radio Propagation Models
• General Soldering Information
• Desoldering THM and SMT
• Surface Mount Technology (SMT) Terminology
• Dielectric Constants of Commercial PCB Material
• Finesse Voltage Regulator Noise!
• Wavelet Resources from Mathsoft
• Powdered-Iron Toroid Cores: Magnetic Properties
• WC0Y's MMDS downconverter modification website  Includes modifications to California Amplifier downconverters
• 2.4 GHz & 900 MHz Antenna Models
• Texas Instruments Technical Brief SWRA029 - Fractional / Integer-N PLL Basics  (6M PDF)
• Passive Repeaters in Wireless Data link Usage  From Microflect
• Utilizing Directional Antennas for Ad-Hoc Networking (UDAAN)

GBPPR - Facts Not Drivel

The truth, not pointless ramblings by egomaniacs.

• Channel Capacity vs. Signal-to-Noise Ratio  (20k JPEG)
• A Discussion of Antenna Theory  by Paul Graham, K9ERG (One of the better antenna explainations out there)
• Maxwell's Equations  (18k GIF)
• PolyPhaser Technical Information  Trust these people
• Directive Gain, Salesmanship and Ham Radio!  How to determine the real gain of an antenna
• The Perils of Cheap Hamfest RF Adapters  More proof to avoid cheap hamfest connectors like the plague
• The UHF Type Connector Under Network Analysis  RF network analysis of a PL-259/SO-239 connection
• Electrochemical Potential Chart  More myths debunked by GBPPR
• Conductivity and Dielectric Constants for Common Types of Earth  Parameters for use in Radio Mobile Deluxe
• Applying Modern Communication Technologies to Weak Signal Amateur Operations  Very good overview on using 1980's technology and math equations from 1948 to improve weak signal performance in the 21st century.  (657k PDF)
• Ufer Ground System  Grounding rods in concrete

GBPPR Technical Bulletins

1. Waterproofing RF Connectors
2. Advantages of Circular Polarized FM Repeater Antennas
3. Why Silver Plate RF Components?
4. How to Choose Inductors at RF
5. Receiver Noise, Sensitivity and Dynamic Range Relationships
6. Transmitter Site Rules
7. How to Make RF Cables
8. Nuclear Electromagnetic Pulse (NEMP) Survival
9. Communication Channel Capacity

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

Toward New Link-Layer Protocols for Amateur Packet Radio - Overview

• by Phil Karn, KA9Q

Toward New Link-Layer Protocols for Amateur Packet Radio - Notes

• by Phil Karn, KA9Q

Spread Spectrum Rule Recommendations

• by Phil Karn, KA9Q

Ideas for HF Modulation and Coding

• by Phil Karn, KA9Q

Proposed Coded AO-40 Telemetry Format

• by Phil Karn, KA9Q

Spread Spectrum Technology and Current Issues in Amateur Radio

• by Phil Karn, KA9Q and Steve Bible, N7HPR  Real Audio

Amateur Radio, Wireless Networks and the Information Age

• by Glenn Elmore, N6GN

Physical Layer Considerations in Building a High Speed Amateur Radio Network

• by Glenn Elmore, N6GN

A Technological Rationale to Use Higher Wireless Frequencies

• by J.M. Vanderau, R.J. Matheson, and E.J. Haakinson  (1998 - U.S. Department of Commerence)

A Mathematical Theory of Communication

• by Claude E. Shannon  (1948)

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

• by QUALCOMM  (1992)

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

• by Edwin H. Armstrong  (1936)

Shannon, Coding and the Radio Amateur

• by James R. Miller, G3RUH  (1995)

The Shape of Bits to Come

• by James R. Miller, G3RUH  (1995)

Measurement of WLAN Receiver Sensitivity

• Measurement of WLAN Receiver Sensitivity  Technical Bulletin TB382  (28k PDF)

Processing Gain for DSSS Communication Systems and PRISM

• Processing Gain for DSSS Communication Systems and PRISM  Application Note AN9633  (32k PDF)

Microwave Associates (M/A-Com) 10 GHz Gunnplexer Notes

• MA87127 Series Gunnplexer  Bulletin 7624A  (1M PDF)
• MA87728 Series Gunnplexer  (150k PDF)
• 10 GHz Ham Operation with the MA-87127 Gunnplexer  by Klaus Hirschelman, DJ7OO

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

W2IOG Gunnplexer Notes

1. Page 1
2. Page 2
3. Page 3
4. Page 4
5. Page 5
6. Page 6

MMDS Downconverter Notes & Applications

• California Amplifier 31732 Information and Modifications  by Adam, G0ORY
• Gardiner MMDS Downconverter LO2398  by Adam, G0ORY
• California Amplifier 31732 Modifications for 2401 MHz Reception  by Ward, WC0Y
• California Amplifier MMDS Downconverter Partial Schematic  (97k PNG)

Metricom Ricochet Radio Modem Information

• GBPPR's Metricom Ricochet Radio Experimentation
• Starmode Radio IP (STRIP)
• Metricom Ricochet Notes

Amateur Radio Repeater Notes

Proper repeater design is not that hard.

• Coaxial Resonators
• Articles by K7PP
• Homebrew Cavities and Duplexer
• The Repeater Builder's Technical Information Page
• SouthEast Iowa Technical Society
• 6 Meter Heliax Duplexers
• The KI7DX 6 Meter Repeater

Radar & Military Communications

Communication is the key to success.

• Electronic Warfare and Radar Systems Engineering Handbook  A must read
• Electronic Warfare Online Interactive Calculators
• Association of Old Crows Electronic Warfare Tutorial
• The Radar Pages
• Tactical Radio Jammers
• TRW Digital Processing and Antennas Boost Battlefield Capability of Milstar II Satellites
• Military Abbreviations & Acronyms
• Russian Electronic Warfare Equipment
• Electronic Warfare Programs by AN Nomenclature
• International Electronic Countermeasures Handbook
• EW Reference & Source Guide
• Rockwell Collins Defense Electronics
• Raytheon Defense Electronics
• Principles of the Meteorological Doppler Radar  Good overview of radar operations
• WSR-88D Technical Information
• WSR-88D Technical Information from Lockheed Martin  (250k PDF)
• WSR-88D System Specifications  (823k PDF)
• National Weather Service WSR-88D Transmit/Receive Status
• ITU radar bands
• Traffic Radar Handbook
• AN/TRC-170(V)2 Tropospheric Scatter Microwave Radio Terminal
• How to use APRS for Direction Finding
• Doppler Direction Finder Design Notes
• Doppler Direction Finder Design Notes #2
• Epsilon Nought  Radar remote sensing
• MX Missile Command, Control & Communication  (850k PDF)
• English-to-Russian Online Translator

Hardware & Parts Suppliers

Our main sources for RF parts and electronic components.

• Online Cables  Custom and pre-made RF cables at low prices
• Coilcraft  Free sample inductors
• Maxim IC  Free sample RF ICs
• Rogers Corporation  Free sample Teflon PC board
• RF Micro Devices  Best assortment of RF ICs
• Hittite Microwave Corporation  Sells RF ICs directly to the public
• Dan's Small Parts and Kits  Low cost parts for the homebrewer
• Down East Microwave  New & surplus RF parts/kits for the experimenter
• Fair Radio  New & surplus RF parts
• FindChips.com  Fastest, most complete distributor search available
• Radio Works  RF connectors
• Cable X-perts  Coax & RF connectors
• Ham Radio Parts & Stuff  Harry Kholer, N0PU
• The Toroid King  Dieter Gentzow, W8DIZ
• Mendelson Electronics  Good surplus electronics deals
• Richardson Electronics  Sells hard to find RF parts in single quantities

GBPPR Contact Information

Send email to:       contact [at] gbppr.org    (We no longer offer help to Europeans)

Also be sure to subscribe to the Low Cost Wireless Networks mailing list        lcwn [at] yahoogroups.com

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

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