Project Page for
Site last updated May 29, 2005
Added New Ham Partner 22, fixed a few links.
Added Simplifed A-Tone Decoder
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Articles for Club Newsletters : For those needing an article for a club newsletter, please visit my New Ham Partner Page.
This page is for the projects of Gerry Crenshaw WD4BIS. Many of the projects are PIC and BASIC STAMP related. Projects for the "Home Brew" classes sponsored by the Garland Amateur Radio Club will be documented here as well.
If a project for the GARC "Home Brew" class is being done from a publication such as QST magazine from the ARRL or CQ, Credit will be given to the authors of the projects.
Most of projects are related to amateur radio. Here you will find the schematics, parts lists, drawings and general ramblings and code and assembly files for the projects.
Simplifed A-Tone Decoder (75T204 Based) and
Original A-Tone Decoder (75T202 Based)
This is a project for RACES members, here in the Dallas Tx. Area we
send an DTMF A-Tone from a radio keypad prior to a net to alert
members to weather or other nets.
The A-Tone project lost its use when we went to a comercial paging system. The comercial paging system has gotten busy in the past 10 years or so and somtimes the pages are delayed or not sent at all. I was asked to look into this again. My original A-Tone was based around a75T202 Tone decoder IC that has gotten hard to find. A local Vendor did have a quantity of the 75T204 Tone decoder IC's and I designed a new simplifed decoder around it.
Audio from the radio is terminated into a dummy load until a DTMF A-Tone is sent over the air. When this is sensed it is decoded and the audio is routed and latched to an external speaker until the decoder is reset, arming it for the next use. No modification to the radio is needed. The decoder is pluged into the external speaker jack of the radio.
Automated Fox
Countdown Timer
RACES/ARRL Field Service 2 pin Molex Connector
Handi-Finder Class
This is a simple device used for radio direction finding. Originally
published in the May 1993 QST. The schematic and PWB have been
re-drawn and converted to GIF for net access. The project is being
resurrected because of a planned Radio Amateur Balloon Launch in
Henderson County. They are looking for lots of radio direction
finding people to help recover the instrument package.
Making Printed Wiring Boards using a Laser Printer
PG-4S Programing cable
This is a programing cable for Kenwood TM-7A Dual band radio and the TM-G707E.
The resulting surface mount PWB is about the
size of a postage stamp that is wedged between the pins of a DB9
connector. By building an adapter it can also be used for the TH-F6
/ TH-G71. Note: I had a good yeild on the last bunch of these I
etched and still have cards. I have several assembled cards as well
minus the MiniDIN6 contact me if intrested.
Ethernet Cables and other
RJ45 Connections
This page is to the answer the questions on Ethernet cables and other
RJ45 connections I always seem to get.
Interfacing the Tiny TrakII to a Kenwood TM261
This page shows how I interfaced the the TinyTrackII
to my TM261.
Garmin GPS Interfaces
Several people have requested information on how I interfaced the
Garmin GPS units to the TinyTrakII and PC. Here are the connections.
Computer Hutch for Texas Tech Dorm Student Desk.
In memory of J. Frank Smith WA4QAB who went silent key in June 2000. A friend, a mentor and a buddy who helped me through rough times after the death of my first wife.
73 and GL WA4QAB
Have a commment or want to share an idea or a project. Please sign my guestbook and tell me about it. 73's Gerry
