Test indicators for radios and players Sensitivity:
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â‘´ Input 1kHz 30% AM signal, carrier 1000kHz, adjust the volume control to standard level output.
⑵ Cancel AM (AM OFF), MV meter rotates two gears counterclockwise (10dB per gear)
⑶ Increase the input signal level and adjust the volume control to maintain the output standard level, at this time the output level on the signal generator is the receiver's 20dB noise limit sensitivity
2. S / N:
⑴ Input 1000kHz, AM (1kHz 30%) signal to achieve the standard output level ⑵ AM OFF, measure the noise output level of the receiver, the difference between the two values ​​is S / N
3. Optional:
⑴ Input 1000kHz, AM (1kHz 30%) signal to achieve the standard output level ⑵ The generator is adjusted to 990kHz and 1010kHz, increase the output level to achieve the standard output level Selectivity
4. AGC scope:
⑴ Input 1000kHz, 100mV / m, 30% AM signal, adjust to standard output level ⑵ Input level is adjusted to make the receiver output level 10dB lower than the standard value, the difference between the input level of the two signals is the local AGC
range
5. SD Sensitivity: Input 999kHz 36dB 30% AM signal, automatic search
6. Tuning distortion:
⑴ Input 1000kHz, 5mV / m, 30% AM signal, adjust to standard output level ⑵ Measure harmonic distortion with distortion meter, expressed in%
7. Maximum useful power: input 1000kHz, AM (1kHz 30%) signal, gradually increase the volume, so that the harmonic distortion coefficient of the audio output voltage reaches 10%, the output power value at this time Second, FM test:
1. Noise limit sensitivity:
⑴ Input 98MHz, 1kHz ± 75kHz standard FM signal, adjust the volume control to standard level output.
⑵ FM OFF, MV meter rotates three gears counterclockwise (10dB each gear)
⑶ Increase the input signal level and adjust the volume control to maintain the output standard level, at this time the output level on the signal generator is the receiver's 30dB noise limit sensitivity
2. S / N:
⑴ Input 98MHz, 1kHz ± 75kHz standard FM signal, adjust to standard output level ⑵ FM OFF, measure the noise voltage value of the receiver, the difference between the two values ​​is S / N
3. Image suppression:
⑴ Input 88MHz or 108MHz FM (1kHz ± 22.5kHz) signal and adjust to standard output level ⑵ Adjust the input to the mirror frequency of 109.4 or 129.4MHz, fine-tune the frequency to maximize the audio output of the receiver Standard output, the level difference between the two signals is image suppression
4. Maximum useful power: input 98MHz, FM (1kHz ± 22.5kHz) signal, gradually increase the volume, so that the audio distortion rate reaches 10%, the output power at this time is the maximum useful power
5. SD sensitivity: input 98MHz, 25 ± 10dB level FM signal, automatic search
6. Tuning distortion:
⑴ Input 98MHz, FM (1kHz ± 75kHz) signal, adjust to standard output power ⑵ Measure voltage harmonic distortion coefficient, change audio frequency to upper and lower limits, measure distortion coefficient
7. Lighting sensitivity: input 98MHz FM signal to make the stereo light on and reduce the level to the threshold level
8. Separation: input 98MHz 1mV FM signal to achieve the standard output level. When left / right modulation is performed separately, the difference is the left and right channel separation of stereo. 3. Playback test:
1. Tolerance of playback speed: use test strip (MTT-111 3kHz), adjust to standard output level, measure output frequency and calculate the speed tolerance of the output = (output frequency-3kHz) / 3kHz X100%
2. Playback jitter rate: use a test strip (MTT-111 3kHz), the output is connected to the jitter pendulum meter, read the jitter pendulum rate, at the beginning of the test strip,
Test the middle section and the tail end separately
3. Playback signal-to-noise ratio: use the test band (MTT-212 315Hz 0dB), adjust the volume to the standard output level, use the blanked band to measure the noise level, the difference is S / N
4. Playback harmonic distortion: use the test strip (MTT-212 315Hz 0dB), adjust the volume to the standard output level, and use the distortion meter to test the indicators of Class A and A receivers:
1. Frequency range: AM 515 ~ 1640kHz FM 87 ~ 108.5MHz LW 140 ~ 295kHz
2. Intermediate frequency: AM 450 ± 5kHz FM 10.7MHz ± 0.3MHz
3. Noise limit sensitivity: AM ≤120uV (41.6dBuV) FM ≤35uV (31dBuV)
4. S / N: AM ≥45dB FM ≥50dB
5. MW selectivity: ≥25dB
6. Image suppression: AM ≥20dB FM ≥26dB
7. MW AGC range: ≥30dB
8. SD sensitivity: FM 25 ± 10dB AM 36 ± 10dB
9. Harmonic distortion: MW ≤7% FM ≤2%
10. FM lighting sensitivity: ≥20dB
11. FM separation: ≥20dB
12. Tolerance of playback speed: -0.5% + 3.5% (3kHz -10dB)
13. Playback shake rate: ≤0.18% (3kHz -10dB)
14. Play S / N: ≥48dB
15. Distortion harmonic distortion: ≤2%
16. Channel isolation: ≥26dB
17. Stopping sensitivity: FM ≤25dBuV AM ≤80dBuV
18. Maximum output power: 6WX2