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ETS 300 441: February 1996
7.8.2
Method of measurement
An A2A test signal at the carrier frequency 2 182 kHz, modulated to a depth of 30 % at 1 kHz shall be
applied to the receiver input at a level such that a SND/N ratio of 10 dB is produced.
The carrier frequency of the input signal shall then be varied between 100 kHz and 2 GHz to search for
spurious responses. For each spurious response found, the carrier frequency of the input signal shall be
adjusted to give maximum output power. The input level shall then be adjusted to give a SND/N ratio of
10 dB at the output of the receiver. The ratio between the input level of each spurious signal and the input
level of the wanted signal shall then be evaluated.
7.8.3
Limit
All spurious response rejection ratios shall be not less than 60 dB.
7.9
Harmonic distortion
7.9.1
Definition
The harmonic distortion at the output of the receiver is defined as the percentage of the total rms voltage
of all harmonic components of the modulating audio frequency to the total rms voltage of the signal
delivered by the receiver.
7.9.2
Method of measurement
An A2A test signal at the carrier frequency 2 182 kHz modulated to a depth of 30 % at 1 kHz shall be
applied to the receiver input and its level shall be set in turn to + 40 dB
µ
V and + 80 dB
µ
V. The audio
frequency gain control shall be set to give rated output power. At each setting of input level the modulation
depth shall be increased from 30 % to 80 % and the audio gain control used to maintain the output level at
rated output power.
7.9.3
Limit
At a modulation depth of 30 % the harmonic distortion shall not exceed 10 %.
At a modulation depth of 80 % the harmonic distortion shall not exceed 15 %.
7.10
Conducted spurious emissions
7.10.1
Definition
Conducted spurious emissions are emissions at any frequency conducted into the antenna or artificial
antenna.
7.10.2
Method of measurement
Conducted spurious emissions shall be measured across the resistive part of the artificial antenna
specified in subclause 5.6.
The measurement shall be carried out within the frequency range 9 kHz - 2 GHz using a spectrum
analyzer or a frequency selective measuring instrument. The resolution bandwidth of the spectrum
analyzer or the frequency selective measuring instrument shall be set to 200 Hz for the frequency range
9 kHz to 150 kHz, 10 kHz for the frequency range 150 kHz to 30 MHz and 100 kHz for the frequency
range 30 MHz to 2 GHz.
7.10.3
Limits
The power of any discrete component measured in the artificial antenna shall not exceed 2 nW.
7.11
Automatic gain control
An automatic gain control capable of satisfactory operation shall be provided.
