Sherwood RX-772, Руководство по обслуживанию

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● AM SECTION
Measuring methods in confirmity with IEC standard 315
Measurements condition AM - MW : Radio frequency = 1000/999kHz, Audio frequency = 400Hz
Reference level = 5mV/m,10mV/m on 50ohms Modulation = 30%
Test Point : MW TP1 = 603kHz, TP2 = 999kHz, TP3 = 1404kHz
No. UNIT NOMINAL L/R LIMIT L/R
1 TUNING COVER RANGE LOW ~ HIGH MW kHz
STEP AUTO/Man. kHz
2 USABLE SENSITIVITY TP 1 dBu/m
≤
55
≤
65
S/N = 20dB TP 2 dBu/m
≤
55
≤
65
TP 3 dBu/m
≤
55
≤
65
3 S/N RATIO
(100dBu/m,30% MOD)
4 TOTAL HARMONIC DISTORTION
(74dBu/m,30% MOD)
5 OVER LOAD DISTORTION
(94dBu/m,80% MOD)
6 FREQUENCY RESPONSE at -6dB
(at 74dBu/m,400Hz)
7 SELECTIVITY 10kHz/9kHz TP 2 dB
≥
23
≥
15
8 AGC FIGURE OF MERIT
(at 100dBu/m,400Hz)
9 IMAGE REJECTION TP 3 dB
≥
30
≥
25
10 WHISTLE MODULATION 2IF=74dBu/m %
≤
10
≤
15
3IF=94dBu/m %
≤
10
≤
15
11 AUTO STOP LEVEL 999kHz dBu/m
≤
46
≤
65
522kHz dBu/m
≤
57
≤
75
1611kHz dBu/m
≤
55
≤
70
12 TUNED LEVEL dBu/m
≤
48
≤
65
13 OUTPUT LEVEL (74dBu/m,30% MOD) mV 200±50 200±70
≥
40
≥
60 dB TP 2
TP 2 Hz 60~2.2K 100~2K
TP 2 %
≤
3
≤
5
≤
3
TP 2 dB
≥
45
DESCRIPTION
TP 2 %
≤
1.5
≥
40
522~1611
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