KD1JV Designs
QRP Kits and Projects for the low power Amateur Radio enthusiast
Steven "Melt Solder" Weber
Note new email address above
QRP KITS
The ATS-3B kits are now sold out and are now officially "retired".
Already have an ATS rig or want to talk to people who have one? Join the ATS users group.
http://groups.yahoo.com/group/AT_Sprint
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.
Nearly ready : the ATS-4
The firmware is still being tweaked, the manual is barely started and some parts have a much longer lead time to obtain than expected, so I won't likely be able to start taking orders or to start shipping this new rig until the 3d or 4th week of March. The price is now set at $225.00
The ATS-4 now has the ability to transmit PSK using Morse paddle input or from the message memories. Vojtech, AB2ZA has been working on a PSK decoder chip we hope can be tacked into the rig to make a truely stand alone PSK station. Although the decoder chip is not likely to be fully ready by the time the rig finally starts to ship, we hope to have all the firmware "hooks" in place so it can be added at a later date without the need for firmware updates to the rig. Of course, Pocketdigi software can still be used for PSK or RTTY modes.
Check out QRPKITS.COM for additional kits designed by KD1JV, such as the DC40B, DC30B and DC20B, which are simple and inexpensive direct conversion rigs. Also the MMR-40, a CW/SSB QRP rig for 40 meters, the PFR-3A, a three band CW rig for portable operation, which includes digital frequency display, built in BLT tuner and battery pack, the SLT+ long wire tuner, and the new Weber Dual band rig, with DDS VFO.
"Build it from Scratch" Home Brew projects
These projects are not available as kits. Your on your own.
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 Resonate 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.