QRSS: Everything You Need to Know
QRSS is a CW mode in which the receiver bandwidth is drastically reduced and the rate at which code is sent is slowed beyond that which would normally be readable by ear. It is named for QRS, … Read More
Resistance and Resistivity: Everything You Need to Know
Resistance and Resistivity Resistance (R) is the measure of how much an object – a resistor – opposes the flow of electric current. The resistance of an object is measured in Ohms (<math>\Omega</math>) Resistivity (<math>\Rho</math>) is a measure of … Read More
What is Gain?
What is Gain? Gain compared to a half wave dipole – dBD The gain of an antenna is the relative increase in radiation at the maximum point expressed as a value in decibels (dB) above a standard. … Read More
What Is Radio Wave Propagation?
Radio wave propagation largely depends on atmospheric conditions, the band and power used to operate the radio equipment. Ground waves are “line of sight” communication. Atmospheric conditions come into play when transmitting between ham radio stations that are farther away … Read More
Radio/PC Interfaces: Everything You Need to Know
There are many brands of interface available to connect a PC to an amateur radio transceiver. Often home-brew interfaces are used. They all do essentially the same thing. They key the radio to transmit, pass … Read More
Semiconductor: Everything You Need to Know
Structure of Atoms The simplest model of atomic structure has each atom is made up of a nucleus containing Protons and Neutrons, with electrons, circling the nucleus at various energy levels (layers). Each layer can only hold a … Read More
Amateur Radio Disaster Services: Everything You Need to Know
In North America, ARES (Amateur Radio Disaster Services, Amateur Radio Emergency Service) provides organization and training for amateur radio volunteers to ensure readiness in times of disaster or civil emergency. ARES volunteers may also provide communications for … Read More
Impedance: Everything You Need to Know
Impedance is a property of electrical circuits that “impedes” current from flowing. Fundamentally, there are two types of impedance: Resistance and Reactance. The magnitude of impedance (represented by <math>Z\,</math>) of a circuit or component can be computed by … Read More
American Radio Relay League: Everything You Need to Know
American Radio Relay League (Redirected from ARRL) The American Radio Relay League (ARRL) (also known as “ARRL, The National Association for Amateur Radio”) was founded in May 1914 by US industrialist Hiram Percy Maxim (W1AW, SK) as … Read More
Radio Call Sign Databases
There are various callsign databases out there. National callsign databases Andorra Antarctica Aruba Argentina Australia Austria Bahrain Belgium Belorussia Bermuda Brazil Bosnia & Herz Bulgaria Canada Canada Crete Cyprus Czech Republic Dominica Ecuador Egypt Estonia … Read More