DRAKE VMM860AG Посібник - Сторінка 3
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6
BROADCAST TV CHANNEL OUTPUT FREQUENCIES
CATV
TABLE 2: BC TV
CATV
BC
TV
+100
VHF BROADCAST CHANNELS
VHF BROADCAST CHANNELS
VHF BROADCAST CHANNELS
VHF BROADCAST CHANNELS
VHF BROADCAST CHANNELS
Visual Carrier
Channel Number
Frequency (MHz)
2
55.25
61.25
3
4
67.25
77.25
5
6
83.25
175.25
7
8
181.25
187.25
9
10
193.25
199.25
11
12
205.25
211.25
13
CATV
CATV
BC
TV
+100
UHF BROADCAST CHANNELS
UHF BROADCAST CHANNELS
UHF BROADCAST CHANNELS
UHF BROADCAST CHANNELS
UHF BROADCAST CHANNELS
Visual Carrier
Channel Number
Frequency (MHz)
471.25
14
477.25
15
483.24
16
489.25
17
495.25
18
501.25
19
507.25
20
513.25
21
519.25
22
525.25
23
531.25
24
537.25
25
543.25
26
549.25
27
555.25
28
561.25
29
567.25
30
573.25
31
579.25
32
585.25
33
591.25
34
597.25
35
603.25
36
609.25
37
615.25
38
621.25
39
627.25
40
633.25
41
639.25
42
645.25
43
651.25
44
657.25
45
663.25
46
669.25
47
675.25
48
681.25
49
50
687.25
693.25
51
52
699.25
705.25
53
54
711.25
717.25
55
56
723.25
729.25
57
58
735.25
741.25
59
60
747.25
753.25
61
62
759.25
765.25
63
64
771.25
777.25
65
66
783.25
789.25
67
68
795.25
801.25
69
REAR PANEL CONNECTIONS / INTERNAL JUMPERS
R1
R2
R5
VIDEO INPUT
FLAT
NORM
AUDIO INPUT
R3
+5V
+12V
GND
DC INPUT
R4
RF OUT
VMM860AG
R1 - VIDEO INPUT
This is the nominal 1 Vp-p baseband video
input to the modulator.
R2 - LEFT/MONO AUDIO INPUT
This is an unbalanced audio input to the
modulator circuits. This "RCA" (phono)
connector input accepts mono audio in the
case of the VMM860AG or the left channel
audio input in the case of the VMM860AS.
R3 - DC INPUT Connector
This 3-pin connector (Male) accepts the
appropriate mating DC power cable.
R1
R2
R6
R4
VMM860AS
Figure 2
R4 - RF OUTPUT
This is the modulator output.
R5 - AUDIO PRE-EMPHASIS SWITCH
VMM860AG only. This switch allows selection
of either normal audio pre-emphasis or flat
audio response. For normal mono audio, set
switch to NORM position. If the MMTS20 BTSC
stereo encoder is used, set this switch to FLAT
and connect stereo audio to the MMTS20. The
encoder will in turn connect to R2.
R6 - RIGHT AUDIO INPUT
VMM860AS only. This is the an unbalanced
input for the right channel stereo audio.
INTERNAL JUMPER SETTING: STD, HRC, IRC
STD
Drawing is not to scale. AG and AS
models differ. The correct set of pins
HRC
is located directly next to the 45.75
MHz crystal. No jumper installed gives
IRC
STD setting.
Figure 3
3
R3