Amateur Radio, the fascinating hobby has a service aspect too. In
case of natural calamities, where primary communication fails, Ham
Radio becomes the second line of communication.
Ham Radio can play a vital role in restoring communication during
times of natural disaster when normal communications are overloaded,
damaged or completely disrupted.
But cyclones, earthquakes or floods are not everyday events. What
we see everyday is that someone in the remote place is struggling
for life, awaiting the arrival of an essential drug from another town
or someone has lost a dear one because medical attention could not
reach him on time. All this happens because most often communication
is slow or impossible. Hams have special section to handle medical
and other emergency traffic on their daily nets.
In the Gujarath (India) earthquake on 26th January 2001, Amateur
Radio Operators living there commenced disaster relief communications
within hours of the tragedy. With the help of Ham's from various part
of the country, an emergency traffic network was established to exchange
information to various parts of the country.
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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