MHz feed is removed from an operating demod causing AFC to lock out of range. It may require up to a minute for lockup when the 70 MHz baseband feed is restored.
ALARM RELAY
AUDIO OUTPUTS: Both balanced and unbalanced outputs are provided. Balanced outputs are 600 ohms with a 300 ohm source termination in each leg. The unbalanced output is tapped off of one of the "hot" balanced terminals with an additional 300 ohms in series to the output phono jack.
The factory meter calibration is made to the balanced output with a 600 ohm load. If only the unbalanced output is used into 600 ohms, the signal will be 6 dB down. If the 600 ohm balanced output is used for program purposes and the unbalanced output is used for monitoring, the unbalanced load should be
METER CALIBRATION: (see Fig. 1) Two factory calibrations are provided for audio output; 0 dBm and +8. The 700 is shipped in the zero mode. To change to the +8 mode, remove the top cover of the receiver and locate the
If a level other than +8 or 0 is desired, change the output level of the receiver to the level desired, using the front panel level adjustment. Note meter calibration pots VR5 and VR6 at each end of the header. Each pot sets the calibration of the respective end of the header pins. These pots can be adjusted to calibrate the meter to a customer defined value in either or both positions.
FREQUENCY SEARCH (and disable of same): Whenever the audio noise level becomes high, a
This feature can be disabled by removing the jumper on header J2 on the receiver board (see Fig.1).
AUDIO PROCESSOR BOARDS are the baby boards mounted in a vertical direction on the edge of the receiver cards. Companding schemes and adjustments are to the customer's specification and are not field adjustable.
Deemphasis time is alterable with jumper placement. Instructions for settings from 0 to 100 microsecond time are etched on the top of the boards.
System Operation MA700SYS.SAM
SECTION 42
