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Radio
Simple version. Full version located here
http://kazus.info/indexs/list_pages_categories/9/0/0.html
CXA1191S
SQUARE WAVE TO TRIANGLE WAVE CONVERTER. This circuit converts a square waveform to a triangle waveform while automatically maintaining a constant triangle amplitude for a wide range of input frequencies. Although originally designed for application in a communications system, the idea is readily adaptable for certain electronic music applications where waveform conversion is desired.
RF amplifier Wide Band -40MHZ
PLL Stereo Decoder with LM1800 [4]
FM Stereo Demodulator with MC1310P [ 3]
Basic RDS Encoder Unit
FM Transmitter
Mains frequency meter (simple)
Ultra low frequency receiver. The frequency covered is from 0.1Hz to 10Hz and useful signals are received up to 16Hz. (simple)
Baluns and coaxial aerials. If you are dealing with radiofrequency aerials you might like to experiment with the configurations proposed. (simple)
Windscreenloop aerial. If you do not like the whip antenna on your car, you may try this alternative circuit. (simple)
Modified Howland Current Source. A Constant Current Source for a Grounded Load using a Single Op-Amp. (Theory)
Bartlett's Bisection Theorem. Modify passive filters for unequal terminations. (Theory)
The 180 Degree Hybrid Junction (180 RF Hybrid) (Tutorial)
Quad-Detector. Varactor diode provides temperature stability for FM quadrature demodulator.
Using mixers in radio communications. (The Linear Diode Detector for AM Demodulation/ The Product Detector for SSB, DSB, and CW Demodulation/ The Quadrature Demodulator/ Costas Loop for Demodulating a BPSK Signal/ Costas Loop for Demodulating a QPSK Signal/ The Filter Method of SSB Generation/ The Phasing Method of SSB Generation/ The Weaver Method of SSB Generation/ The Filter Method of Image Rejection/ The Phasing Method of Image Rejection/ The Weaver Method of Image Rejection)
Introduction to Mixers (RF)
The magic-T and its applications (an alternative to the 6 dB power splitter)
Introduction to Gilbert cells (a cross-coupled differential amplifier)
An Adjustable 4/9:1 - 9:1 Impedance Transformer
RF Directional Couplers. The design and analysis of wirewound toroidal directional couplers.
SDSL Chip Set. xDSL- chip set's
Underground Radio - How to use conductive soil (underground water table) to transmit audio or radio signals. During World War II there were situations were conventional radio was useless, either because enemy jamming or just for hidding purpouses; thus, radio operators forced off the air, tried a different aproach... underground radio. Although it's obviously a less efficient system, it works perfectly well if we find a good conductive sheet beneath.
Supreg 27Mhz receiver. Superregenerative receiver. This is a simple RF receiver mainly for low-distance digital radio receiver application.
FM bug
Economy short-wave radio
Wireless IR h"phone transmitter
Crystal radio
AM Radio
FM stereo decoder
FM transmitter
Short-wave scanner converter
Two band radio
Crystal radio with amplifier
Crystal radio
4W FM transmitter
2-transistor FM transmitter
EXTERNAL TRACKING GENERATOR from 100kHz to 1000MHz (sweep analyzer)
Test generator for 144 MHz with FM
RF detector for 0.001 MHz-1500 MHz
PLL synthesizer-2
PLL synthesizer-1
Block diagram for PLL synthesizer
RF oscillator for 1420-2250 MHz
RF oscillator for 144-146 MHz with FM-2
RF oscillator for 1.2 GHz-2.4 GHz
RF oscillator for 144-146 MHz with FM-1
RF oscillator for 15-25 MHz
RF oscillator for 350-1000 MHz
Measurement results for RF oscillator 1000-1500 MHz
RF oscillator for 1000-1500 MHz
RF divider by 10/11 with SP8695
RF divider by 64/128/256 with NEC506
RF divider by 64/128/256 with MB506
RF divider by 4 with K193IE7
RF divider by 10 with K193IE2
Radio Cassete Recorder FIRST ?556
Player FIRST
Stereo Receiver 22AH777 part 6
Stereo Receiver 22AH777 part 5
Stereo Receiver 22AH777 part 4
Stereo Receiver 22AH777 part 3
Stereo Receiver 22AH777 part 2
Stereo Receiver 22AH777 part 1
Fm radio
Radiostation ALINCO DJ-S41(300Kb)
Baycom Terminal Diagram (modem)
N-888. Programming Instructions. BMP- 663kb.
N-888. BMP - 872kb
CP-50. Clone Schematics - DjVu - 19kb
CP-50. Programming Instructions. DjVu - 228kb.
GP-68. Service Manual. DjVu, 278kb.
DJ-182 - 1.1mb.
HX-242. Programming Instructions. DjVu - 1mb.
HX-240. Programming Instructions. DjVu - 91kb
HX-240. Programming Instructions. BMP - 456kb
IC-V68. Programming Instructions. BMP - 1mb.
IC-706mk2G. Service menu - 35kb
Standard radiostation HX-240 - DjVu-186kb
Standard radiostation HX-240 - 615kb
Motorola radiostation CP-50 (pcb) DjVu-288kb
Motorola radiostation CP-50 (UHF) (sch) DjVu-47kb
Motorola radiostation CP-50 (sch) DjVu-48kb
Motorola radiostation GM-350 (pcb) - DjVu-145kb
Motorola radiostation GM-350 (pcb) - 886kb
Motorola radiostation GM-300 - DjVu-148kb
Motorola radiostation GM-300 - 474kb
Motorola radiostation GP-300 - DjVu-111kb
Motorola radiostation GP-300 - 395kb
Motorola radiostation GM-350 sch - DjVu-218kb
Motorola radiostation GM-350 sch - 872kb
Yaesu , Vertex radiostation FT-840 - 2.1mb
Yaesu , Vertex radiostation VX-1R - DjVu-404kb
Yaesu , Vertex radiostation VX-1R - 1.8mb
Yaesu , Vertex radiostation VX-300 -DjVu-163kb
Yaesu , Vertex radiostation VX-300 - 437kb
Yaesu , Vertex radiostation VX-10 - DjVu-138kb
Yaesu , Vertex radiostation VX-10 - 385kb
Yaesu , Vertex radiostation FC-800 - DjVu-52kb
Yaesu , Vertex radiostation FC-800 - 129kb
Yaesu , Vertex radiostation FT-8500 - DjVu-695kb
Yaesu , Vertex radiostation FT-8500 2.1mb
Yaesu , Vertex radiostation FT-5100 2.2mb
Yaesu , Vertex radiostation FT-2500 - DjVu-147kb
Yaesu , Vertex radiostation FT-2500 - 370Kb
Yaesu , Vertex radiostation FT-51 2.4m
Yaesu , Vertex radiostation FT-50 1.1m
Yaesu , Vertex radiostation FT-40 - DjVu-48kb
Yaesu , Vertex radiostation FT-40 - 115kb
Yaesu , Vertex radiostation FT-26 - 298Kb
Yaesu , Vertex radiostation FT-11R -DjVu-123kb
Yaesu , Vertex radiostation FT-11R - 271Kb
Yaesu , Vertex radiostation DjVu-197kb
Yaesu , Vertex radiostation FT-10R - 632Kb
Kenwood radiostation TS-870 (5) DjVu-148kb
Kenwood radiostation TS-870 (5) 0.7mb
Kenwood radiostation TS-870 (4) 1.9mb
Kenwood radiostation TS-870 (3) DjVu-568kb
Kenwood radiostation TS-870 (3) 2.2mb
Kenwood radiostation TS-870 (2) DjVu-583kb
Kenwood radiostation TS-870 (2) 2.2mb
Kenwood radiostation TS-870 (1) DjVu-380kb
Kenwood radiostation TS-870 (1) 1.6mb
Kenwood radiostation TH-22 - DjVu-163kb
Kenwood radiostation TH-22 - 512kb
Kenwood radiostation TM-733 - DjVu-258kb
Kenwood radiostation TM-733 - 725kb
Kenwood radiostation TM-251 - DjVu-152kb
Kenwood radiostation TM-251 - 447kb
Icom radiostation IC-V68 - DjVu-157kb
Icom radiostation IC-V68 - 445kb
Icom radiostation IC-756 2.3m
Icom radiostation IC-706 2.2m
Icom radiostation IC-229 - DjVu-171kb
Icom radiostation 466kb
Icom radiostation ICF3/F4 1.8m
Icom radiostation IC-2SAT - DjVu-128kb
Icom radiostation IC-2SAT - 393kb
Alinco radiostation DX-701 - 2.9m
Alinco radiostation DJ-F1 - DjVu-157kb
Alinco radiostation DJ-F1 - 377kb
Alinco radiostation DR-605 1.2m
Alinco radiostation DR-599 2.9m
Alinco radiostation DR-140 - DjVu-182kb
Alinco radiostation DR-140 - 542kb
Alinco radiostation DR-130 - 302kb
Alinco radiostation DJ-580 - DjVu-181kb
Alinco radiostation DJ-580 2.3mb
Alinco radiostation DJ-S4- DjVu-176kb
Alinco radiostation DJ-S41- 464kb
Alinco radiostation DJ-S11 DjVu-142kb
Alinco radiostation DJ-S11 400kb
Alinco radiostation DJ-G5 3.1m
Alinco radiostation DJ-G1 414kb
Alinco radiostation DJ-195 DjVu-75kb
Alinco radiostation DJ-195- 237Kb
Alinco radiostation DJ-191 DjVu-179kb
Alinco radiostation DJ-191 629kb
Alinco radiostation DJ-182 389kb
Alinco radiostation DJ-180 428kb
Alinco radiostation DJ-160 1.1m
K7SZL'S BASIC+ HAMCOMM Interface
SSTV modems
HammComm 3.0 (Comparator) Receive Circuit also for use with JVFAX and PKTMON- WB5NBQ
Sound Card Interfacing for RTTY, PSK31, and SSTV
TS-870. Manual - 4.3Mb.
SWR - Meter
Slinky Beverage
5 BANDS SLOPER
Electronic Attenuator
FM Transmiter 4W
Fm Transmit
Transmiter Detector
40-Metre Direct Conversion Receiver
HANDY TELEPHONE RECEIVER
FM Transmitter For Channel Changer
Short Wave AM Transmitter
7MHz CW/AM QRP transmitter
Computerised Morse code generator/transmitter
4 Transistor Transmitter
FM Transmitter
SW Receiver using the ZN414
ZN414 Portable AM Receiver
4 Band Double Tuned Preselector
Q- Multiplying Loop Antenna
MW Preamplifier
Curious C-Beeper
Crystal Radio Amplifier (16k) An unusual amplifier that gives room-filling volume with a few parts.
Constant Reactance Voltage (article RF Design magazine)
A Low Power RF ID Transponder (article RF Design magazine)
New Oscillators Reach for (article RF Design magazine)
Low Frequency (article RF Design magazine)
New Topology Multiplier (article RF Design magazine)
Bootstrapped PLL Improves Oscillator Performance (33k)
Morse Code Beacon Keyer
Active 2nd Order Filters
FM Beacon Transmitter (88-108 MHz)
3 Watt FM Transmitter
Circuit of rf impedance bridge
Noise bridge measuring both R and X
Circuit diagram of the noise bridge
A sensitive crystal diode checker of field-strenght meter using an af transistor as dc amplifier
High-gain field-strength meter by WA4DXP
Circuit diagram of the meter swithing for a mounted reflectometer
Circuit of coupler unit
Circuit of in-line rms/p.e.p. wattmeter
Method of measuring p.e.p output in relation to mean output with two-tone source
Method of using thermal converter for higher powers
Method of application of rf to the bridge
A thermistor bridge
Suitable two-lamp comparator
Rush Converter for the Car. Tune in WRNO at 15.42 MHz and hear a famous talk show!
WWV Converter for the Car. Receive WWV at 10 MHz and other shortwave broadcasts as you drive.
Aircraft Receiver. A passive receiver for listening to the pilot!
One Watt Class-C Amplifier
FM Band Preamplifier. This low noise amplifier will bring in those low-power stations.
Measuring RF Voltages with a VOM
RF Isolator Uses Differential Amplifiers
Antennas! Here are a few notes regarding receiver antennas for AM, shortwave, and scanner frequencies.
Micropower AM band radio station. This simple transmitter offers surprisingly good signal quality.
FM Band Monaural Transmitter. Varactor diode gives high quality modulation.
FM Oscillator
Small Radio Transmitter
RF Sniffer <.5 to >500 MHz
Build a Yagi-Uda Antenna
Active Antenna
Micro Power FM Broadcasting Circuits
Crystal Radio
Op Amp Radio
FM Transmitter
Radio Control Interface
TV/Radio antenna wire isolator
RC Notch Filter (Twin T)
Simple Op-Amp Radio
Active 2nd Order Filters
Op-Amp Basics
Micro Power AM Broadcast Transmitter
Long Loopstick AM Radio Antenna
UHF oscillator
Economoy short-wave radio
Linearized RF detector
Two-band radio
Shortwave conveter for scanners
FM Bug
AM Radio
Toroidal coil RF shortwave receiver
Crystal radio
CW RECEIVER
TRF AM Receiver circuit
WLW 500KW Transmitter Schematic
AM-Receiver for Aircraft communication (118.250MHz)
AM receiver for aircraft communications
80 Meter CW ARDF receiver
Four channel RF remote control
CW zero beat indicator (PDF)
Build your own VLF Receiver
Receiver building blocks
Simple wireless radio data link
RX3302 receiver module schematic
Superregenerative 27MHz receiver
49MHz walkie-talkie
Convert 2m VHF FM PMR transceiver Motorola Radius M110 into an amateur radio
Vibrating pocket bug detector
2MHz RF Oscillator
50-150MHz Overtone Oscillator
Simple Op-Amp Radio
UHF - 100W Transistorized amplifier
50MHz Converter
RF front-end for triple conversion GPS receiver
2M - 20M transverter
Improved CMOS RF PLL sythesizer
Harmonic oscillator
Direction finder system
One transistor regenerative receiver
Synthesized HF receiver
TBA120 narrowband FM receiver
TDA7000 receiver
ZN414 receivers
10W HF linear amplifier
500W HF linear amplifier
3W HF QRP linear amplifier
Phasing SSB exciter
500mW HF linear amplifier
Generic VHF power amplifier
10.7MHz FM detector
RTTY terminal unit
Q-multiplier
CMOS RF PLL sythesizer
3W FM Transmitter
Crystal radio
Op-Amp Radio
Car radio tunes the Amateur Bands
Crystal set that requires no antenna
80m Direct Conversion Receiver
A compact L-match ATU for portable use
Morse Adaptor for your VHF/UHF FM rig
An end-fed antenna, L-match coupler and resistive bridge for HF
AM Broadcast Band Regenerative Receiver
50 MHz to 146 MHz Converter
Hear Amateurs on your Shortwave Radio!
Compact 20 14 MHz direct conversion receiver
Hear Amateurs on your FM Radio!
RF actuated CW monitor
LF to HF Converter
Super 80 ultra-simple SSB receiver for 3.5 MHz
Class B series modulator
L-Band PHEMT LNA for GPS, Inmarsat etc
Advanced VHF power meter
The MRX-40 Mini Receiver
AM Broadcast Band Active Antenna
Active antenna with gain
Ham Band VFO
HF Signal generator
Simple AM Radio Receiver & Amplifier
Bug detector
175KHz inductive pulse receiver (PDF)
200-400 MHz voltage controlled oscillator
AM/FM/SW active antenna
RF Sniffer <.5 to >500 MHz
Demodulator Schematic/Design
AM BCB radio receiver
Regenerative shortwave receiver
DSBSC (Double Side Band Supressed Carrier)
Frequency Synthesizer
Digital Automatic Gain Control (AGC)
Four Channel Wireless Transmitter and Receiver
Talking 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
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
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
AM Transmitter Circuit
AM Receiver
ATL3 Loop Antenna
Band 2 VHF Amplifier
Field Strength Meter
FM Receiver using MPF102
FM Transmitter
Simple Field Strength Meter
Q-Multiplying Loop Antenna
MW Preamplifier
UHF Preamplier
ZN414 Portable AM Receiver
4 Band Double Tuned Preselector
rf Circuits
ZN414 SW Receiver
Surveillance Transmitter Detector
2 Transistor FM Transmitter
2 Transistor Transmitter
24 Hour Timer
4 Transistor Transmitter
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