The Drake MMTS20 Stereo Encoder manual provides detailed instructions for setting up the device, including connecting audio inputs and ensuring proper synchronization with video signals. It also offers guidance on operating the encoder, such as using front panel controls for audio level adjustments and troubleshooting indicators like Pilot Lock and Overmodulation.
Manual Overview
The Drake MMTS20 Stereo Encoder manual provides guidance on troubleshooting, diagnostics, and calibration. The encoder accepts left and right audio inputs to generate a BTSC format stereo signal for compatible audio/video modulators. Key troubleshooting involves monitoring the front panel indicators: the Power indicator confirms DC power connection, the Pilot Lock indicator ensures video sync, and the Overmodulation indicator warns of excessive audio input levels. Calibration involves using the front panel Audio Level control and the Test Tone switch, which enables an internal tone for setting system audio levels. Proper setup requires adjusting the Audio Level control to avoid overmodulation. Rear panel connections include balanced or unbalanced audio inputs and a video sync reference connector. The encoder is powered by a Drake Mini-rack power supply. For diagnostics, the manual emphasizes the importance of maintaining correct audio levels and ensuring synchronization with the video signal. The unit’s performance is contingent on the paired modulator, and detailed specifications are provided for input and output impedance, stereo separation, and frequency response.
Quick Issues Covered
- Pilot Lock indicator for video sync diagnostics.
- Test Tone switch aids in audio level calibration.
- Overmodulation indicator for audio input level adjustment.
Overview
The R.L. Drake MMTS20 is an MTS stereo encoder that processes left and right audio inputs to generate a composite BTSC stereo signal. This signal is used with a compatible audio/video modulator. The MMTS20 features a modular design for integration with Drake Mini-rack systems, allowing for flexible configurations. It includes front panel controls for audio level and test tone, as well as indicators for power, pilot lock, and overmodulation. The rear panel provides connections for balanced or unbalanced audio inputs and video sync reference. The unit requires a compatible Drake Mini-rack power supply module for operation.
Specifications
- Input Impedance: 40 K Ohms balanced, 20 K Ohms unbalanced
- Input Level: 250 mVrms to 2.5 V, front panel adjustment
- Video Input Impedance: High impedance
- Video Input Level Range: 0.5 Vp-p to 2 Vp-p
- Output Impedance: 100 Ohms
- Output Level: 10 mV/kHz, +10%
- 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
- Test Tone Frequency: 10.396 kHz +50 Hz
- Test Tone Amplitude: 0.5 Vp-p +10%
- DC Power Input: +12 V 45% @ 150 mA
- Operating Temperature Range: 0° C to +50° C ambient
- Size: 1” W x 3.5" H x 7.5” D
- Weight: 10.7 oz. (0.3 Kg)
Controls & Indicators
The front-panel controls and indicators for the MMTS20 Stereo Encoder include:
– Power Indicator: Lights when the unit is connected to the required source of DC power.
– 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.
– Test Tone Switch: Switch to the ‘ON’ position to enable an internal test tone to aid system audio level setup. The normal position of this switch is the ‘OFF’ position.
– Overmodulation Indicator: Lights to indicate greater than 25 kHz of main channel deviation. Adjust the AUDIO LEVEL control to a point where the OVERMODULATION indicator just remains off.
– Audio Level Control: This screwdriver adjustment determines the audio input signal level.
Installation / Setup
The source does not provide specific information on installation or setup highlights such as wiring, clearances, calibration, or prerequisites.
Operation
The MMTS20 Stereo Encoder is designed to accept left and right channel audio inputs and generate a composite BTSC format stereo signal. This signal is then applied to the audio input of a compatible audio/video modulator. The encoder can be paired with a Drake Mini-rack fixed channel or agile type Video Modulator in a multiple unit rack configuration.
The rear panel provides left and right audio inputs for either balanced or unbalanced operation. The MMTS20 requires a video sync reference from the modulator for the encoding process. The front panel includes an Audio Level control and a Test Tone switch, with indicators for Power, Pilot Lock, and Overmodulation. The rear panel includes a ‘F’ type connector for video sync reference and 3.5 mm ‘stereo’ type receptacles for audio inputs. The composite BTSC signal output is through a rear panel RCA type phono connector. The unit is powered by a compatible Drake Mini-rack power supply module.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Refer to the PDF for details.
Download MANUAL Manual (PDF – 146.0 KB)
Drake-mmts20-instruction MANUAL: Guide for technicians to troubleshoot and calibrate the MMTS20 model. File size: 146.0 KB.
- Brand: Drake-mmts20-instruction
- Model: MANUAL
- Type: Manual
- File size: 146.0 KB
Overview
Brief overview of the product.
Specifications
- Key spec 1
- Key spec 2
Controls & Indicators
Control panel/button layout.
Installation / Setup
- Step 1…
- Step 2…
Operation
Basic usage, modes, cycles.
Troubleshooting & Error Codes
| Issue / Code | Fix |
|---|---|
| Example | How to fix… |
Safety & Warnings
- Important warning…
Downloads
Drake-mmts20-instruction MANUAL Overview
The Drake-mmts20-instruction MANUAL is a comprehensive guide designed to help users effectively operate and maintain the Drake-mmts20 technical equipment. This device is engineered for precision measurement and control applications, offering reliable performance in various industrial and laboratory environments. The manual provides detailed instructions to maximize the utility and lifespan of the equipment.
Main Features and Specifications
- High-precision measurement capability with minimal error margin
- Robust construction suitable for industrial use
- User-friendly interface with clear display and controls
- Multiple input/output options for versatile connectivity
- Compact and lightweight design for easy portability
- Energy-efficient operation with low power consumption
- Comprehensive diagnostic and calibration functions
Basic Usage and Operation Tips
Before using the Drake-mmts20, ensure the device is properly calibrated according to the manual’s instructions. Power on the equipment and allow it to initialize fully before starting measurements. Use the interface buttons to select the desired measurement mode and input parameters carefully. Always handle the device with clean hands and avoid exposure to extreme temperatures or moisture. For optimal accuracy, perform routine calibration checks as outlined in the manual.
Troubleshooting and Maintenance
If the device fails to power on, check the power supply and connections first. In case of erratic readings, recalibrate the device and inspect for any physical damage or loose components. Regularly clean the exterior with a soft, dry cloth and avoid using harsh chemicals. Store the equipment in a dry, dust-free environment when not in use. Refer to the troubleshooting section of the manual for detailed error codes and corrective actions.
Safety Reminder
Always follow the safety guidelines provided in the manual to prevent injury or equipment damage. Do not attempt to disassemble or modify the device. Use only approved accessories and power sources. Keep the device away from water and flammable materials. Ensure proper grounding and avoid operating the equipment in explosive atmospheres.