The International Space Station is populated by astronauts who are all Amateurs. ISS partner countries USA, Canada, Russia, Europe and Japan, operate ARISS – Amateur Radio on the International Space Station. To downlink is 145.800 FM. (There other frequencies … Read More
A continuous-wave is an electromagnetic wave of constant amplitude and frequency, a pure carrier, and information is carried by turning the wave on and off. Morse code is often transmitted using CW (on-off keying). The term … Read More
A Yagi-Uda antenna (named for its two Japanese creators) is built around of a half-wave dipole mounted on a perpendicular boom. Behind the dipole, which serves as the one driven element in this antenna, is a parasitic reflector … Read More
APRS operates by receiving packets on a single fixed frequency (on 2 meters this is normally 144.39MHz North America or 144.8MHz Europe), storing them and retransmitting them until they reach a station which can transfer the information … Read More
In amateur and commercial land-mobile radio, as well as in radio/television broadcasting, a repeater is a station that receives a signal on one frequency, immediately retransmitting it (normally on a different frequency) in order to extend … Read More
History In landline railroad telegraphy, operators traditionally had referred to each other as OM (“old man”). The term YL was coined in 1920 by the American Radio Relay League for young ladies of all ages, as “OM will not fit and … Read More
QRP is a CW prosign that means “low power”. It is commonly agreed that QRP refers to the power of 5 watts or less. (The term QRPp is used for power less than 1 watt.) The … Read More
What is an attenuator? An attenuator is a resistive device that reduces the amplitude of a signal without adding distortion to it. The amplitude of a radio signal is the power, so an attenuator is … Read More
Please consult your national band plan to confirm these frequencies. Some of them may not be within amateur bands in some countries. More detailed information can be found here from Dave, KB4YZ Analogue SSTV Calling Frequencies 70 … Read More
IRESC stands for INTERNATIONAL RADIO EMERGENCY SUPPORT COALITION. The main objectives of IRESC are to foster efficient collaboration between Radio Amateurs, extending friendships across the world and providing international emergency communications in times of need. IRESC is … Read More