Standard Communications TVM Series Owner's Manual page 19

12. BTSC INPUT – Green LED. Lights when the rear panel AUDIO switch (17) or
4.5 MHz switch (18) are in BTSC or EXT positions, respectively.
13. VIDEO TEST – 75-ohm BNC connector. Used to monitor the video output.
14. –20 dB RF TEST – 75-ohm F connector. Used to monitor RF output. Signal
level is –20 dB.
Rear Panel for Models with CMA60 Audio Module
15. MONO IN (+) and IN (–) – Screw terminals. A monaural audio input.
16. GND – Screw terminal. An external ground connection.
17. AUDIO – Slide switch. Turns pre-emphasis on or off.
18. 4.5 MHz – Slide switch. Selects either the internally generated 4.5 MHz car-
rier or an input from the EXT 4.5 MHz IN jack.
19. EXT 4.5 MHz IN – 75-ohm F connector. An input for a 4.5 MHz aural carrier
from an external source. The required input level is +30 to +60 dBmV.
20. VIDEO IN – 75 ohm F connector. An input for the video signal.
21. RF OUT – 75 ohm F connector. For the
54 to 450 MHz (TVM450) or 550 MHz (TVM550) modulator output signal.
22. REMOTE – Special connector. This jack is used when the CALT45 option is
installed.
23. VISUAL IF IN – 75 ohm F connector. For a visual IF input from other
equipment. The input level required is 40 ± 1.0 dBmV.
If an IF input is used, the frequency stability of the modulator is determined
by the frequency stability of the IF signal source.
24. VISUAL IF OUT – 75 ohm F connector. The output of the internal Visual IF
signal. Output level is 40 ±1.0 dBmV.
25. AURAL IF IN – 75 ohm F connector. An input for an external Aural IF sig-
nal. The required input level is 25 ± 1.0 dBmV.
26. AURAL IF OUT – 75 ohm F connector. The output of the internal Aural IF
signal. The required output level is 25 ± 1.0 dBmV.
27. OFFSET – Rotary switch. Manually selects the offset frequency. This allows
the equipment ROM to choose the FCC offset frequency automatically when
in the AUTO position, or turns the unit's ROM-pro-grammed FCC offset fre-
quency off when in the OFF position.
28. FUSE HOLDER – Houses the equipment's primary power fuse.
TVM450/S/TVM550/S/TVM550II/TVM550IIS
NOTE
Owner's Manual
Controls and Connections
Page 3-3