Adcom GTP-740, Service Manual

Page: 53 / 58

69
TECHNICAL SPECIFICATION GTP-740
FM SPECIFICATION
Frequency Range: 87.5 to 108.1±0.02MHz
Specification Details Freq. Unit Limit(AH) Limit(C)
1. Input sensitivity (1KHz, 3% THD) 97.7MHz dBµ
≤
17
≤
27
(U: mond. 75KHz)
(C: mond. 40KHz)
2. 50dB quieting Stereo 97.7MHz dBµ
≤
43
≤
437
(mod. 75KHz) Mono 97.7MHz dBµ
≤
20
≤
28
3. S/N Ratio (mod. 75KHz)
(60dBf IHF wtd)
Stereo 97.7MHz dB
≥
62
≥
57
Mono 97.7MHz dB
≥
70
≥
70
4. THD
(60dBµ IHF wtd)
Stereo 97.7MHz %
≤
0.40
≤
0.40
(U: Mod. 75KHz) L+R
(C: Mod. 40KHz) L-R 97.7MHz %
≤
0.70
≤
0.70
5. IF Rejection (10.7MHz) 97.7MHz dB
≥
65
≥
75
(U: mod. 75KHz)
(C: mod. 40KHz)
6. Image Rejection (119.4MHz) 97.7MHz dB
≥
58
≥
65
(U: mond. 75KHz)
(C: mond. 40KHz)
7. Capture ratio (45dBf) 97.7MHz dB
≤
2
≤
1
(U: mod. 75KHz)
(C: mod. 40KHz)
8. AM suppression 97.7MHz dB
≥
55
≥
50
@60dBf mod. 75KHz
9. Pilot suppression L 97.7MHz dB
≥
55
≥
55
(mod. 75KHz) R 97.7MHz dB
≥
55
≥
55
10. Frequency response In In between 30Hz & 15kHz
(1kHz Ref, 75usec). (U: mod 75KHz) dB 0±1
(1kHz Ref, 50usec). (U: mod 40KHz) dB 0±1.5
11. Channel Separation 30Hz 97.7MHz dB
≥
30
≥
30
(@60dBµ) 1kHz dB
≥
35
≥
32
(U: mod. 75KHz) 10kHz dB
≥
30
≥
27
(C: mod. 40KHz)
12. Alternate channel selectivity. (@45dBf)
(U: mod. 75KHz) +400KHz dB
≥
55
≥
65
(C: mod. 40KHz) -400KHz
≥
55
≥
65
13. Auto-search sensitivity dBµ 18 to 32 18 to 32
(U: mod. 75KHz)
(C: mod. 40KHz)
Remark: The TUNER measurement will be taken from the TAPE output for FM/AM.
2AM BAND SPECIFICATION
Frequency Range: 520KHz - 1720KHz Set 10KHz
Freq. Unit Limit
1. Input Sensitivity 1000kHz dBµ
≤
24
(10% THD)
2. S/N Ratio 1000kHz dB
≥
45
(@2mV 66dBµ input)
3. THD 1000kHz %
≤
3
(30% mod@ 1KHz 66dBµ)
4. Image Rejection (LO + 2*IF) 1900KHz dB
≥
30