DRAKE MMTS20 Manuel - Page 2

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FRONT PANEL CONTROLS and INDICATORS

F1 - POWER Indicator

Lights when the unit is connected to the

required source of DC power.

F2 - PILOT LOCK Indicator

Lights to indicate that a video signal is applied

to the rear panel VIDEO INPUT connector and

that the MMTS20 is locked to the video

horizontal sync.

F3 - TEST TONE Switch

Switch to the 'ON' position to enable an internal

test tone to aid system audio level setup. See

the 'Installation' section of this manual for setup

information. The normal position of this switch

is the 'OFF' position.

F4 - OVERMODULATION Indicator

Lights to indicate greater than 25 kHz of main

channel deviation. After system audio

modulation levels are properly set, and with left

and right audio source input, adjust the AUDIO

LEVEL control (see item F5) to a point where

the OVERMODULATION indicator just

remains off.

MMTS20

STEREO

ENCODER

POWER

PILOT

LOCK

TEST

TONE

OFF

OVER-

MOD

AUDIO LEVEL

Figure 1

F5 - AUDIO LEVEL Control

The setting of this screwdriver adjustment

determines the audio input signal level. After

system audio modulation levels are properly

set, and with left and right audio signals within

the 250 mVrms to 2.5 V rms range, set this

control to a point where the

OVERMODULATION indicator just remains off

(see item F4).

AUDIO INPUT

Input Impedance:

40 K Ohms balanced,

20 K Ohms unbalanced.

Input Level:

250 mVrms to 2.5 V, front panel adjustment.

VIDEO INPUT

Input Impedance:

High impedance, intended to be paralleled with paired

A/V modulator unit.

Input Level Range:

Input Level Range: 0.5 Vp-p to 2 Vp-p.

COMPOSITE OUTPUT

Output Impedance:

100 Ohms, intended to drive high impedance audio

input of paired A/V modulator.

Output Level:

10 mV/kHz, ±10%.

1.1 Vp-p for a 100% modulation signal.

STEREO PERFORMANCE

Stereo Separation:

Greater than 20 dB.

Total Harmonic Distortion:

Less than .25%.

S/N Ratio:

Greater than 65 dB.

Frequency Response:

Within ±1 dB from 40 Hz to 12.5 kHz.

Spurious Subcarrier:

-50 dBc typical.

NOTE:

System performance is dependant upon paired modulator.

TEST TONE

Frequency:

10.396 kHz ±50 Hz.

Amplitude:

0.5 Vp-p ±10%; all output levels are calibrated to the

level of this tone and is used to set system audio

levels for proper stereo operation. The paired A/V

modulator audio response must be set for "Flat"

(pre-emphasis defeated).

GENERAL

DC Power Input:

+12 V ±5% @ 150 mA

(+5 V is not required for this unit).

Operating Temperature Range:

C to +50

Size:

1" W x 3.5" H x 7.5" D

(2.5 cm) W x (8.9 cm) H x (19.1 cm) D.

Weight:

10.7 oz. (0.3 Kg).

Specifications subject to change without notice or obligation.

SPECIFICATIONS

C ambient.