Friday, February 24, 2006

Ham Glossary 1


Adjacent-channel interference
When a receiver is tuned to a specific frequency and interference
is received on a nearby frequency.

AF (Audio Frequency)

AFC (Automatic Frequency Control)
Automatically compensate frequency drift.

AFSK (Audio Frequency Shift Keying)

AGC (Automatic Gain Control)
Automatically optimize receiver amplifier gain.

ALC (Automatic Limiting Control)
Limits RF drive level to power amplifier during transmit to prevent

AM (Amplitude Modulation)

AMSAT (AMateur SATellite)

AMTOR (AMateur Teleprinting Over Radio)
A form of RTTY, radio teletype.

ANF (Automatic Notch Filter)

ANL (Automatic Noise Limiter)
Eliminates impulse and static noise peaks.
ANT (ANTenna)

Antenna ground system
Term used for a RF reference potential for some types of antennas.
Most unbalanced or asymmetrical antennas need a
good RF ground.

Antenna impedance
The impedance of an antenna at its resonance. Although an
antenna’s impedance fluctuates with the frequency of operation,
an antenna should be 50 Ω for most transceivers.

Antenna matching
When the antenna’s impedance at resonance is at optimum
performance for your transmitter output circuit.

Antenna tuner
Device used to match an antenna to the output impedance
of a transmitter.

APC (Automatic Power Control)
Current limiting of power amplifier to prevent damage to finals
in high SWR conditions.

APRS (Automatic Position Reporting System)
In conjunction with a GPS and TNC provide position reporting.

ARES (Amateur Radio Emergency Service)
ARES is a public-service organization of the ARRL.

ARRL (The American Radio Relay League)
The National Association for Amateur Radio in the US.

ASCII (American National Standard Code for Information Interchange)
A seven-unit digital code for the transmission of teleprinter

ATT (ATTenuator)
A network designed to reduce the amplitude of a signal.

ATV (Amateur Television)
FSTV (fast scan TV), SSTV (slow scan TV)

Auto patch
Used in repeater operation for telephone interconnect.

Average power
Power measured on standard power meter.


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