A range of frequencies in various bands are allotted for Ham Radio
operation. Hams communicate on these frequencies. Communication between
ham radio operators are popularly refered as QSO.
Usual Amateur Radio communication involves exchange of reception
report, personal details, technical discussion, experiments, information
on ham radio etc..
Reception reports are exchanged in RST (readability, Strength, Tone)
system. Readability in the range 1 to 5. The value of 5 means excellent
readability. The signal strength and tone in the range 1 to 9. The
report of 59 means readable (excellent) and very strong signal. Tone
is only used for CW (morse code). The reception report 599 means strong
CW signal with excellent Readability and Tone.
You can listen to Ham communications on any ordinary radio receiver.
Turn your radio receiver to any of the popular Ham Band. For example
turn receiver to 40m Band. 40 meter ham band is from 7.0 MHz to 7.1
MHz.
On most radio receiver 40 meter band is on Short Wave 1 (SW1). You
can listen to many ham stations on morning and evening hours. For
40 meter operation many of the hams are using ordinary radio receiver.
I used Philips DL384 a 3 band Broadcast Receiver. An external antenna
will help in receiving weak stations clearly
7MHz
SSB Transceiver - Circuit digram and brief description of
7MHz SSB Transceiver for Hams. The circuit is designed around two numbers
of MC1496. It can push around 80 Watts with IRF840 in the final. You can
down load HTML version or the printer friendly word document.
Morse
Code Tutor - A program (23kb) written in C++. Morse code
uses dot and dash for communication. Still it is popularly used for communication
is short wave bands. The Archive contains program source code and executable.
AM
DSB Transmitter for Hams - circuit diagram of simple double
side band suppressed carrier (DSBSC) transmitter for hams. Circuit uses
crystal oscillator, crystal can be switched for multi band operation.
600
Volt Power Supply - simple 600 Volt DC power supply. Convert
230V AC to 300V and 600V DC.
Ham
Radio BFO- circuit diagram of beat frequency oscillator
using BF494 and how to listen amateur radio communication on ordinary
BC receiver.
Miniature
MW Transmitter - circuit diagram of simple medium wave transmitter
using BF494B. This simple transmitter have a range of 200 meters.
807
and 1625 Valves - data on vacuum tubes 807 and 1625 used
in ham radio transmitters. Describes various pin voltages and different
operation modes.
FM
Wireless Mike - low power frequency modulated transmitter
using two transistors. The circuit works with 9v power supply.
60
Watt RF Amplifier - Soild state RF power amplifier using
IRF840. Simple and easy to construct. IRF840 can handle a maximum power
output of 125 Watts.
Simple
RF Power Meter - simple RF power meter cum dummy load for
low power transmitters.
Touch
CPO - touch operated code practice oscillator using popular
timer IC555. Practice Morse code in a different way.
Modulation
Monitor - very simple and useful circuit used to monitor
on air transmission of your low power amplitude modulated transmitter.
Cheap
Crystal filter - Ladder filter using six 4.43MHz Crystals.
Building cheap side band filter for your bome brew SSB Rig.
RF
Dummy Load - make this simple RF Dummy Load for off-air testing
of your radio transmitter.
Mosquito
Repellant - very simple and easy to assemble mosquito repellant
using two transistors and handy components.
Ceramic
Filter BFO- Receive SSB and CW transmissions
on your BC receiver. Simple BFO is build around 455 KHz Ceramic Filter.
SSB
ADAPTOR - Build this simple adaptor to receive single side
band SSB on short wave AM receivers.
QRP
Keyer - very simple keyer circuit using only one transistor.
Designing
RF Probe - make your self simple and heighly useful RF probe.
An essential tool for every home brewer.
Shorty
Forty Antenna - Do you have space limitaion to put a 40 meter
dipole. Try this Compact 40 meter antenna.
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