Radio (RF) Frequency Schematics

10.7MHz FM detector
10W HF linear amplifier
136 kHz direct conversion receiver
14MHz SSB 10mW Transceiver
175KHz inductive pulse receiver (PDF)
200-400 MHz voltage controlled oscillator
222 MHz Transverter
2M - 20M transverter
2MHz RF Oscillator
2N2222 40 Meter CW/DSB Transceiver
30m direct conversion receiver
30M PSK31 Transceiver
3W FM Transmitter
3W HF QRP linear amplifier
40m direct conversion receiver
42 Mc Band to 88 Mc Band (retrofit converter) Project
45-860MHz Radio receiver based on UV916-tuner
49MHz walkie-talkie
5 watt, 80 meter QRP CW Transceiver
500mW HF linear amplifier
500W HF linear amplifier
50-150MHz Overtone Oscillator
50MHz Assistant (Preamp & Power Amp.)
50MHz Converter
56K RF Modem
73MHz remote controller hallogen light
7MHz SSB Transceiver
80 Meter CW ARDF receiver
80M ARDF direction finder
80m direct conversion receiver
Active antenna with gain
Advanced VHF power meter
AM BCB radio receiver
AM Broadcast Band Active Antenna
AM Radio
AM receiver for aircraft communications
AM to FM conveter
AM/FM/SW active antenna
AM-Receiver for Aircraft communication (118.250MHz)
Assorted RF circuits
Basic RF oscillator
Bug detector
Bug detector
Build your own VLF Receiver
Building a Simple LF Exciter
CB (27MHz citizens band) 2.5W transmitter
CB (27MHz citizens band) receiver
Class B series modulator
CMOS RF PLL sythesizer
Convert 2m VHF FM PMR transceiver Motorola Radius M110 into an amateur radio
Crystal radio
Crystal radio
Crystal radio circuits including diode performance comparison
CW RECEIVER 40/80 meter CW receiver
Demodulator Schematic/Design
Digital Automatic Gain Control (AGC)
Direction finder system
DSBSC (Double Side Band Supressed Carrier)
Economoy short-wave radio
External antenna for the GPS-38, Magellan 2000, or Eagle Explorer GPS receivers
FM Bug
Four channel RF remote control
Four Channel Wireless Transmitter and Receiver
Frequency Synthesizer
Generic VHF power amplifier
Ham Band VFO
Harmonic oscillator
HF Signal generator
How to Build a 300MHz AM, RF Remote Control System
Huge LED Antenna Direction Display (part 1)
Huge LED Antenna Direction Display (part 2)
ICOM CI-V interface with RS232 RTS to PTT
Improved CMOS RF PLL sythesizer
Improved FM Stereo Modulator
Linearized RF detector
One transistor FM receiver
One transistor regenerative receiver
One Watt 2.45 GHz Linear Amplifier
Op-Amp Radio
Phased lock loop schematic
Phasing SSB exciter
PLL FM transmitter
PLL synthesizing oscillator (1)
PLL synthesizing oscillator (2)
PLL synthesizing oscillator (3)
Popcorn direct conversion receiver
Q-multiplier
Radio Control Electric Switch
Receiver
Receiver building blocks
Regenerative shortwave receiver
RF front-end for triple conversion GPS receiver
RF Modem Robotics Project
RF Sniffer <.5 to >500 MHz
RTTY terminal unit
RX3302 receiver module schematic
Shortwave conveter for scanners
Simple AM Radio Receiver & Amplifier
Simple Op-Amp Radio
Simple wireless radio data link
Smooth Tone Clickless CW Sidetone Generator
SOP direct conversion receiver
SOP receiver (PDF)
Superregenerative 27MHz receiver
Synthesized HF receiver
TBA120 narrowband FM receiver
TDA7000 receiver
The MRX-40 Mini Receiver
Toroidal coil RF shortwave receiver
TRF AM Receiver circuit
Two-band radio
UHF - 100W Transistorized amplifier
UHF oscillator
Variety of receiver converter projects
VFO from 2001 ARRL Handbook, page 14.20
VFO from 2001 ARRL Handbook, page 17.74
Vibrating pocket bug detector
VLF radio receiver schematic
WLW 500KW Transmitter Schematic
Yaesu band decoder schematic
Yaesu FT-736R doppler compensation
ZN414 receivers

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