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== Bandwidth == | == Bandwidth == | ||
'''Bandwidth''' is the width of the [[#Band|band]] occupied by a particular signal. It varies significantly with the [[mode]] in use; an [[FT8]] signal has a bandwidth of about 50 [[#Hertz|Hz]], while an [[SSB]] signal is typically about 3,000 Hz (3 kHz). All else being equal, a signal with a narrower bandwidth will be received more strongly than a wider signal, but will not convey as much information in a given period of time. | '''Bandwidth''' is the width of the [[#Band|band]] occupied by a particular signal. It varies significantly with the [[mode]] in use; an [[FT8]] signal has a bandwidth of about 50 [[#Hertz|Hz]], while an [[SSB]] signal is typically about 3,000 Hz (3 kHz). A WiFi signal has a bandwidth of at least 20,000,000 Hz (20 MHz), far too wide for use on [[HF]] or [[VHF]] bands, but suitable for some [[microwave]] bands in [[High-Speed Multimedia]] networks. All else being equal, a signal with a narrower bandwidth will be received more strongly than a wider signal, but will not convey as much information in a given period of time. Another benefit of a narrower bandwidth is that it leaves more "room" for other operators. | ||
== HT == | == HT == | ||
Revision as of 12:20, 28 February 2023
This is a glossary of common amateur radio terms.
Band
A band is a contiguous segment of the radio frequency spectrum. For example, the 2 meter band, the most widely used VHF amateur radio band, extends from 144 to 148 MHz (megahertz). (Megahertz are a measurement of frequency.) Bands can overlap; for example, VHF itself is the band of frequencies from 30 to 300 MHz.
Bandwidth
Bandwidth is the width of the band occupied by a particular signal. It varies significantly with the mode in use; an FT8 signal has a bandwidth of about 50 Hz, while an SSB signal is typically about 3,000 Hz (3 kHz). A WiFi signal has a bandwidth of at least 20,000,000 Hz (20 MHz), far too wide for use on HF or VHF bands, but suitable for some microwave bands in High-Speed Multimedia networks. All else being equal, a signal with a narrower bandwidth will be received more strongly than a wider signal, but will not convey as much information in a given period of time. Another benefit of a narrower bandwidth is that it leaves more "room" for other operators.
HT
An HT (handheld transceiver) is a handheld, battery-operated amateur radio transceiver. Virtually all HTs are low-power (typically 8 watts or less) VHF and/or UHF radios.
Packet Radio
Packet radio is a digital system that creates computer networks using radio links. APRS is a popular use of packet radio.
Sound Card
A sound card is a computer peripheral device that encodes and decodes audio signals. They can be built into the computer or connected externally by USB. The SignaLink is a special sound card designed to connect to ham radio transceivers for digital modes such as FT8 and the Fldigi modes.
Transceiver
A transceiver is a radio device that can both transmit and receive signals. Most ham radios are transceivers.
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