Broadcast And Acoustics

Front 1

An AM Broadcast Station licensed for aural or sound transmissions intended for direct reception by the general public and operated on a channel in the Medium Freq Band.

Back 1

Medium Frequency Broadcast Station

Front 2

The band of frequencies from 526.6 to 1705 khz

Back 2

Medium Freq Broadcast Bamd

Front 3

The band of freq occupied by the carriwr of 2 sidebands of an am signal with carreier freq at the center.

Back 3

Medium freq broadcast channel

Front 4

A sinusoidal voltage or current generated in a transmitter and subsequently modulated by a modulating wave.

Back 4

Carrier wave

Front 5

Freq of the carrier wave

Back 5

Carrier freq

Front 6

Carrier freq at any particular time

Back 6

Operating freq

Front 7

The carrier freq authorized by the authority

Back 7

Authorized freq

Front 8

Unit of freq, cycles per second

Back 8

Hertz

Front 9

The ratio of half the difference between the max and min amplitude of the amplitude wave to the average amplitude expressed in percentage

Back 9

Percentage modulation

Front 10

Means the greatest percentage of modulation that may be obtained by a transmitter without producing, in its output, harmonics of the modulating freq in excess of those permitted by these regulations.

Back 10

Maximum Percentage of Modulation

Front 11

Is the modulation in the last radio stage of the system

Back 11

High-Level modulation

Front 12

Is the modulation produced in an earlier stage than the final

Back 12

Low- level modulation

Front 13

Is the transmitter output power.

Back 13

Operating Power

Front 14

Is the maximum power at which the transmitter can be operated satisfactorily and is determined by the design of the transmitter.

Back 14

Maximum Rated Carrier Power

Front 15

Is the power authorized by the Authority

Back 15

Authorized Operating Power

Front 16

Is the product of voltage and current at the output of the last radio stage, measured without modulation.

Back 16

Input Power

Front 17

Is the product of the square of the antenna current and the antenna resistance at the point where the current is measured.

Back 17

Antenna Input Power

Front 18

Is the radio frequency current in the antenna with no modulation

Back 18

Antenna current

Front 19

Means the total resistance of the transmitting antenna system at the operating frequency and st the point at which the antenna current is measured.

Back 19

Antenna resistance

Front 20

Means the last audio amplifier stage of the modulating wave which modulates a radio freq stage.

Back 20

Modulator Stage

Front 21

Means the radio freq stage to which the modulator is coupled and in which the continuous wave is modulated in accordance with the system of modulation and the characteristics of the modulating wave.

Back 21

Modulated stage

Front 22

The RMS value of the voltage stress

Back 22

Field Strength

Front 23

The RMS value of the inverse distance field at 1.6km

Back 23

Effective field

Front 24

The groundwave field is not subject to objectionable interference or objectionable fading.

Back 24

Primary service area

Front 25

Area served by the skywave and not subject to objectionable interference.

Back 25

Secondary service area

Front 26

Area receiving service from the groundwave but beyond the primary service area and subject to some interference and fading.

Back 26

Intermittent service area

Front 27

Ratio between the values of voltage of the unwanted sitnal and the voltage of the interference

Back 27

AF Signal to Interference Ratio

Front 28

Is the agreed minimum value of the audio freq signal to interference ratio

Back 28

AF Protection Ratio

Front 29

Is the ratio between the values of the radio frequency voltage of the wanted signal and the interfering signal

Back 29

RF wanted to interference signal ratio

Front 30

Is the value of the radio freq wanted to interference signal ratio that enables the audio freq protection ratio to be obtained

Back 30

RF protection ratio

Front 31

A transmitter whrre a qualified technician is in attendance during all periods of its operation.

Back 31

Attended transmitter

Front 32

The variation of the mean carrier amplitude resulting from the process of amplitude modulation

Back 32

Carrier shift

Front 33

The effective value of the harmonic voltages present in the audio freq output of the equipment under test.

Back 33

Total harmonic distortion

Front 34

Means the RMS value of the voltage of spurious origin present in the audio frequency output or equipment under test

Back 34

Noise level

Front 35

The noise level in that band measured by an instrument

Back 35

Unweighted noise level

Front 36

The variation over a specified audio frequency range of the transmission efficiency of the equipment under test.

Back 36

Frequency response

Front 37

Ratio in db of power delivered to a load at a specific freq usually 1khz

Back 37

Gain of an AF amplifier

Front 38

An emission on any freq outside of the assigned channel or authorized bans of freq and tolerances allowed by these regulations.

Back 38

Spurious Emission

Front 39

The ntc

Back 39

Authority

Front 40

The holder of the license for broadcasting station issued by the authority.

Back 40

Licensee

Front 41

A person who is a holder of a radio operators license or its equivalent issued by the authority

Back 41

Qualified technician