7MHz SSB Transceiver
DSBSC (Double Side Band Supressed Carrier)
Frequency Synthesizer
Digital Automatic Gain Control (AGC)
Four Channel Wireless Transmitter and Receiver
PLL synthesizing oscillator (1)
PLL synthesizing oscillator (2)
PLL synthesizing oscillator (3)
2N2222 40 Meter CW/DSB Transceiver
Yaesu FT-736R doppler compensation
Phased lock loop schematic
30M PSK31 Transceiver
SOP receiver (PDF)
SOP direct conversion receiver
Receiver
30m direct conversion receiver
Popcorn direct conversion receiver
40m direct conversion receiver
80m direct conversion receiver
Huge LED Antenna Direction Display (part 1)
Huge LED Antenna Direction Display (part 2)
136 kHz direct conversion receiver
One Watt 2.45 GHz Linear Amplifier
222 MHz Transverter
VFO from 2001 ARRL Handbook, page 17.74
VFO from 2001 ARRL Handbook, page 14.20
Assorted RF circuits
14MHz SSB 10mW Transceiver
Building a Simple LF Exciter
Yaesu band decoder schematic
VLF radio receiver schematic
5 watt, 80 meter QRP CW Transceiver
How to Build a 300MHz AM, RF Remote Control System
RF Modem Robotics Project
PLL FM transmitter
ICOM CI-V interface with RS232 RTS to PTT
Improved FM Stereo Modulator
Smooth Tone Clickless CW Sidetone Generator
Variety of receiver converter projects
One transistor FM receiver
42 Mc Band to 88 Mc Band (retrofit converter) Project
Crystal radio circuits including diode performance comparison
50MHz Assistant (Preamp & Power Amp.)
Bug detector
Basic RF oscillator
Radio Control Electric Switch
56K RF Modem
80M ARDF direction finder
