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41 Cards in this Set
- Front
- Back
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. |
Medium Frequency Broadcast Station |
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The band of frequencies from 526.6 to 1705 khz |
Medium Freq Broadcast Bamd |
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The band of freq occupied by the carriwr of 2 sidebands of an am signal with carreier freq at the center. |
Medium freq broadcast channel |
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A sinusoidal voltage or current generated in a transmitter and subsequently modulated by a modulating wave. |
Carrier wave |
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Freq of the carrier wave |
Carrier freq |
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Carrier freq at any particular time |
Operating freq |
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The carrier freq authorized by the authority |
Authorized freq |
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Unit of freq, cycles per second |
Hertz |
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The ratio of half the difference between the max and min amplitude of the amplitude wave to the average amplitude expressed in percentage |
Percentage modulation |
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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. |
Maximum Percentage of Modulation |
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Is the modulation in the last radio stage of the system |
High-Level modulation |
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Is the modulation produced in an earlier stage than the final |
Low- level modulation |
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Is the transmitter output power. |
Operating Power |
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Is the maximum power at which the transmitter can be operated satisfactorily and is determined by the design of the transmitter. |
Maximum Rated Carrier Power |
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Is the power authorized by the Authority |
Authorized Operating Power |
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Is the product of voltage and current at the output of the last radio stage, measured without modulation. |
Input Power |
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Is the product of the square of the antenna current and the antenna resistance at the point where the current is measured. |
Antenna Input Power |
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Is the radio frequency current in the antenna with no modulation |
Antenna current |
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Means the total resistance of the transmitting antenna system at the operating frequency and st the point at which the antenna current is measured. |
Antenna resistance |
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Means the last audio amplifier stage of the modulating wave which modulates a radio freq stage. |
Modulator Stage |
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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. |
Modulated stage |
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The RMS value of the voltage stress |
Field Strength |
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The RMS value of the inverse distance field at 1.6km |
Effective field |
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The groundwave field is not subject to objectionable interference or objectionable fading. |
Primary service area |
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Area served by the skywave and not subject to objectionable interference. |
Secondary service area |
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Area receiving service from the groundwave but beyond the primary service area and subject to some interference and fading. |
Intermittent service area |
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Ratio between the values of voltage of the unwanted sitnal and the voltage of the interference |
AF Signal to Interference Ratio |
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Is the agreed minimum value of the audio freq signal to interference ratio |
AF Protection Ratio |
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Is the ratio between the values of the radio frequency voltage of the wanted signal and the interfering signal |
RF wanted to interference signal ratio |
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Is the value of the radio freq wanted to interference signal ratio that enables the audio freq protection ratio to be obtained |
RF protection ratio |
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A transmitter whrre a qualified technician is in attendance during all periods of its operation. |
Attended transmitter |
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The variation of the mean carrier amplitude resulting from the process of amplitude modulation |
Carrier shift |
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The effective value of the harmonic voltages present in the audio freq output of the equipment under test. |
Total harmonic distortion |
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Means the RMS value of the voltage of spurious origin present in the audio frequency output or equipment under test |
Noise level |
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The noise level in that band measured by an instrument |
Unweighted noise level |
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The variation over a specified audio frequency range of the transmission efficiency of the equipment under test. |
Frequency response |
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Ratio in db of power delivered to a load at a specific freq usually 1khz |
Gain of an AF amplifier |
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An emission on any freq outside of the assigned channel or authorized bans of freq and tolerances allowed by these regulations. |
Spurious Emission |
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The ntc |
Authority |
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The holder of the license for broadcasting station issued by the authority. |
Licensee |
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A person who is a holder of a radio operators license or its equivalent issued by the authority |
Qualified technician |