User manual DRAKE DIGITAL MMTS20

[. . . ] Some states do not allow limitations on how long an implied warranty lasts or do not allow the exclusions or limitation of incidental or consequential damages, so the above limitation and exclusion may not apply to you. This warranty gives you specific legal rights and you may also have other rights which vary from state to state. This warranty shall be construed under the laws of Ohio. AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUDIO AUD IO MMTS20 POWER SUPPLY AUDIO VIDEO VIDEO VIDEO VIDEO VIDEO VIDEO VIDEO VIDEO STEREO ENCODER POWER AUDIO VIDEO PWR A/V PWR A/V PWR A/V PWR A/V PWR A/V PWR A/V PWR A/V PWR A/V VIDEO PWR A/V # CH RF # CH RF # CH RF # CH RF # CH RF # CH RF # CH RF # CH RF # CH ON OF F PILOT LOCK TEST TONE OVERMOD PWR # A/V CH RF # CH RF AUDIO LEVEL 4 POSITION RACK UNIT OR MMTS20 and other compatible modular units POWER SUPPLY AUDIO LEVEL AUDIO LEVEL AUDIO LEVEL POWER POWER ON OFF OFF ON ON OFF ON RMM4 The R. L. Drake MMTS20 is an MTS stereo encoder which accepts left and right channel audio input and generates a composite BTSC format stereo signal. [. . . ] 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. VIDEO INPUT Input Impedance: High impedance, intended to be paralleled with paired A/V modulator unit. 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. 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. 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). 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. 5) Set the 'Audio LEVEL' control on the MMTS20 to a point where the 'OVERMODULATION' indicator just remains off or flashes occasionally. R1 R2 R3 METHOD 2: (If a spectrum analyzer is not available). 1) Connect the MMTS20, A/V modulator, compatible DC power source, and video source signal as shown on this page. Keep the 'TEST TONE' switch 'OFF' for this procedure. [. . . ] Use the Tip (+) and Ring (-) of a mating male 3. 5 mm `stereo' plug for a balanced connection. If an unbalanced input is required, the Ring (-) contact should be connected to ground (shield) with the audio hot connected to the Tip (+). MMTS20 STEREO ENCODER POWER PILOT LOCK ON OFF TEST TONE OVERMOD Video Input Loop-Through Composite Audio Out DC Input Audio Cable Video Input Audio Input DC Input AUDIO LEVEL Audio In MMTS20 FRONT MMTS20 REAR Right audio source Left audio source (250 mV rms to 2. 5 V rms) To System Distribution or A/V MODULATOR TV Receiver 4 INSTALLATION maintain a ±1 dB variation of adjacent channel carriers. 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. [. . . ]