User manual DRAKE DIGITAL MMTS20

[. . . ] DRAKE COMPANY determines is due to: (1) Improper maintenance or repair, including the installation of parts or accessories that do not conform to the quality and specifications of the original parts. (2) Misuse, abuse, neglect or improper installation. All implied warranties, if any, including warranties of merchantability and fitness for a particular purpose, terminate three (3) years from the date of the original purchase. DRAKE COMPANY'S entire obligation with respect to this product, and the original purchaser shall have no other remedy and no claim for incidental or consequential damages, losses or expenses. [. . . ] Drake Company P/N: 3852478D-10-2001 Printed in U. S. A. OFF AUDIO LEVEL POWER POWER OVERMOD OVERMOD OVERMOD PILOT LOCK STEREO ENCODER STEREO ENCODER STEREO ENCODER STEREO ENCODER TEST TONE PILOT LOCK MMTS20 MMTS20 MMTS20 MMTS20 TEST TONE OVERMOD PILOT LOCK PILOT LOCK TEST TONE TEST TONE 2 FRONT PANEL CONTROLS and INDICATORS F1 F2 F3 PILOT LOCK SPECIFICATIONS 7 MMTS20 STEREO ENCODER POWER 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. STEREO PERFORMANCE Stereo Separation: Total Harmonic Distortion: S/N Ratio: Frequency Response: Spurious Subcarrier: NOTE: F4 F5 ON OFF TEST TONE OVERMOD AUDIO LEVEL Figure 1 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. 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). Greater than 20 dB. Within ±1 dB from 40 Hz to 12. 5 kHz. 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: 00 C to +500 C ambient. 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. (0. 3 Kg). Specifications subject to change without notice or obligation. 6 INSTALLATION - AUDIO LEVEL SETTING, continued The system audio levels are now properly set. Disconnect the test equipment. REAR PANEL CONNECTIONS / INTERNAL JUMPERS 3 4) Set the MMTS20 'TEST TONE' switch to the 'OFF' position. [. . . ] Aural/Visual (A/V) ratios should be held to -15 dB or less. The output `RF' and `A/V (Ratio)' controls are used respectively to make these adjustments. RACK MOUNTING Adequate ventilation is very important in multichannel installations. Some air movement is mandatory in enclosed rack cabinets. [. . . ]