KD1JV Designs
QRP Kits and Projects for the low power Amateur Radio enthusiast
Steven "Melt Solder" Weber
Note new email address above
No, I'm not dead yet, but a recent and potentually deadly illness got me thinking I should start to find new homes for stuff I don't use too often anymore. (And to help pay for the insane medical bills this has cost me!) As the things listed now are sold, I'll try to replace it with new stuff, so check to see what's available from time to time.
QRP KITS
SKC
Simple Keyer Chip II. The SKC is a basic iambic keyer with selectable Iambic A or B modes of operation. The keyer now includes two, 30 character message memories. Sequenced audio mute and transmitter keying outputs along with sidetone output allow for easy intergration into homebrew rigs. 8 pin dip IC and two 2N7000 mosfets for mute and keying output buffering for $3.00 plus $2.00 for shipping per order.
SOLD OUT (ALREADY!)
It might take until July or August to get another batch ready
The ATS-4
Minature 5 band CW / digital mode HF transceiver*
Small size, BIG performance
* external digital mode decoder required
CLICK here for more info and order info
Already have an ATS rig or want to talk to people who have one? Join the ATS users group. Manuals, updates and corrections can be found in this group.
http://groups.yahoo.com/group/AT_Sprint
Check out QRPKITS.COM for additional kits designed by KD1JV
"Build it from Scratch" Home Brew projects
These projects are not available as kits.
Notice: all projects are copyright by Steven Weber, 2010 and are presented here for individual, non-commercial use only.
72 part contest rig: This 30 meter rig with superhet receiver and xtal controlled transmitter won "Honorable mention" in the 2010 FDIM ACRI design contest. Uses a LM386 audio amp as a combination product detector / audio amp.
Wireless Morse thermometer: Build a wireless thermometer which transmits the temerature in degrees F or C to your HF receiver in Morse code! Uses Atmel Tiny13A processor and Maxim DS18B20 digital temperature sensor with micro power crystal oscillator. Source code provided, programmed Tiny13A chips are available.
WWV Reciever - Simple Direct Conversion receiver to use with a PC to calibrate a 10 MHz oscillator as an accurate frequency reference.
The MAS-80 - Designed to be competative in the DL 80M "Mininum Art Session" contest, this rig features a crystal controlled 2W transmitter and a sensitive regenerative receiver, using 51 discrete parts on a 3.5" x 2.5" circuit board.
The ADC-40 - All Discrete Components 40 M transceiver with super-het receiver using no IC's, just a whole bunch of transistors of various flavors (NPN, PNP, J-FET, MOSFET)
Modifying The ScQRPion paddle to use ball bearing pivits
Amplified speaker in Altoids tin. Built for use with MP3 player, but can be used with other headphone only devices. (PDF file)
6 Meter SSB transceiver This design may not be reproducable, but is a good source of ideas.
PSK Transceiver Unique transceiver design does not use a SSB transmitter! (which turns out can't work!)
The MMR-40 Winner of the ARRL Homebrew challenge, non-PC option category.
A 40 meter CW/SSB transceiver using less than $50.00 in parts. How to build "dead bug" style.
The AP-80. Moderately complex, but inexpensive to build 80 M Transceiver with DC Rx.
SSB1 (Fairly) Simple SSB rig with PTT for 75 meters NEW improved circuit and board layout
SSB2 Revised (Fairly) Simple SSB rig, two part system, exciter, receiver, and 25 watt linear for 75 meters. Exciter board PCB layout now included!
SSB3 Experimental SSB exciter/receiver using bi-directional amplifiers and analog switching mixers.
DCRX Deluxe Direct Conversion Receiver. Immune to AM SWBCI.
SWRX Short Wave AM Broadcast Receiver. Simple, inexpensive and effective.
CW SPKR 600 Hz Resonant speaker. Folded channel box design. Makes an amazing difference!
ALT Altoids L Tuner (ALT) "L" tuner for half wave end feed antennas.
The "Tenna Dipper" Poor mans antenna analyzer, shows resonance of antennas, 80-10 M operation.
The "Tuner Dipper" Similar to the Tenna Dipper, but fixed crystal controlled frequency, used to adjust antenna tuners.
Linear scale analog RF power meter.
PS 0-14 volt, 0-2 amp current limited variable power supply regulator
LED battery voltage monitor. A fuel gage for your gel cell battery.
ANT Portable 40/20 trap dipole.
TX Tube Transmitter with 5763 PA and grid block keying.
LED headlamp projects:
Super bright green LED headlamp (pdf file) Modify a cheap headlamp to use a 1/2W green LED
Using an AVR Tiny13V microcontroller as step up (boost) or step down (buck) voltage converter for driving a white or high power LED. (pdf file) Desgin equations and source code included.
Reprogram
the inexpensive Butterfly demo board for these ham radio
applications:
AD9850/ AD9851 DDS display/controller. Rx/Tx rig VFO and signal generator applications
Digital Power / SWR meter, 0-9.99 watts
Iambic keyer. Displays what your sending on the LCD display. Includes 2, 120 character keyer memories, 5 to 40 wpm speed and tune mode. Now includes 5 random character code practice generation.