The manual for Drake's Rack Mount Distribution Amplifiers provides detailed instructions on setup, operation, and troubleshooting for models DAR8642, DAR8633, DAR8618, DAR7542, and DAR7533, which are designed for RF signal distribution in the frequency range of 54 to 860 MHz. It includes information on installation procedures, adjusting gain and slope controls, monitoring input and output levels, and handling optional fixed input attenuators and equalizers to ensure optimal performance and low distortion.
Manual Overview
The Drake Rack Mount Distribution Amplifiers, including models DAR8642, DAR8633, DAR8618, DAR7542, and DAR7533, are designed for RF signal distribution in the 54 to 860 MHz range. These amplifiers are suitable for indoor headend use in both residential and commercial settings. Most models feature a push-pull hybrid input preamp and a power doubled hybrid output amplifier, except for the DAR8618, which lacks an input preamp and adjustable gain and slope controls. Troubleshooting involves monitoring input and output levels via dedicated connectors, with adjustments made using the Gain and Slope controls, which have a 10 dB minimum range. Error diagnostics can be facilitated by observing the Power LED and using the input/output monitor ports. Calibration involves setting the Gain and Slope controls to achieve desired output levels, ensuring the input levels remain within the specified optimum range to minimize distortion. Optional fixed input attenuators and equalizers can be installed for further adjustments. The amplifiers are housed in rugged aluminum and operate on a 115 VAC, 60 Hz power supply.
Quick Issues Covered
- Diagnose power-up failures using the F1 Power LED indicator.
- Calibrate gain and slope using F3 and F4 controls respectively.
- Trace circuits with provided schematics for efficient troubleshooting.
Overview
The R.L. DRAKE models DAR8642, DAR8633, DAR8618, DAR7542, and DAR7533 are broadband distribution amplifiers designed for indoor headend use in residential and commercial buildings. They operate within a frequency range of 54 to 860 MHz, providing low distortion signals for SMATV or CATV headend applications. Most models feature a push-pull hybrid input preamp and a power doubled hybrid output amplifier, except the DAR8618, which lacks an input preamp and adjustable gain and slope controls. These amplifiers include provisions for optional fixed input attenuators and equalizers, a built-in diplexer filter, and input/output test connectors for signal monitoring. They are designed for stability, low distortion, and low noise, housed in rugged aluminum casings, and operate on a nominal 115 VAC, 60 Hz input.
Specifications
- Forward Gain Adjustment Range: 10 dB minimum (except DAR8618).
- Slope Control Adjustment (54 MHz): 10 dB minimum (except DAR8618).
- Input/Output Impedances: 75 Ohms.
- Input and Output Monitor Ports: – 30 dB.
- Fixed Input Attenuator: Plug-in (SXP type) available.
- Fixed Input Equalizer: Plug-in (QSA type) available.
- Hum Modulation: – 70 dB.
- Frequency Coverage (return port): 5 to 42 MHz.
- RF Shielding: Leakage complies with FCC Part 76.
- Power Requirement: Models DAR7533, 7542, 8633, 8642 – 115 VAC, 60 Hz, 24 Watts; Model DAR8618 – 115 VAC, 60 Hz, 18 Watts.
- Operating Temperature Range: – 20 deg. to + 60 deg. C.
- Size: 19.00" (48.3 cm) W x 7.5" (19.1 cm) D x 1.75" (4.5 cm) H.
- Weight: 6 lbs. 4 oz. (2.9 Kg).
- Frequency Coverage (forward path): DAR7533, DAR7542 – 54 to 750 MHz; DAR8633, DAR8642, DAR8618 – 54 to 860 MHz.
- Forward Gain: DAR7533, DAR8633 – 33 dB; DAR7542, DAR8642 – 42 dB; DAR8618 – 18 dB.
- Noise Figure: DAR7533 – 7 dB maximum; DAR7542 – 6.5 dB maximum; DAR8633 – 7.5 dB maximum; DAR8642 – 7 dB maximum; DAR8618 – 7.5 dB maximum.
- Return Loss, Input & Output: 14 dB.
- Channel Loading: DAR7533, DAR7542 – 110 CH; DAR8633, DAR8642, DAR8618 – 129 CH.
- Output Level (maximum per channel for distortions listed below): DAR7533, DAR7542 – +44 dBmV; DAR8633, DAR8642, DAR8618 – +40 dBmV.
- Input Level (maximum without using fixed input attenuator): DAR7533 – +20 dBmV; DAR7542 – +10 dBmV; DAR8633 – +18 dBmV; DAR8642 – +7 dBmV; DAR8618 – +22 dBmV.
- Optimum Input Level Range for Best Performance: DAR7533 – +10 dBmV to +15 dBmV; DAR7542 – +0 dBmV to +5 dBmV; DAR8633 – +7 dBmV to +12 dBmV; DAR8642 – -3 dBmV to +2 dBmV; DAR8618 – N/A.
- Nonlinear Distortions- Composite Triple Beat: DAR7533, DAR7542 – – 58 dB; DAR8633, DAR8642 – – 60 dB; DAR8618 – – 61 dB.
- Composite Second Order: DAR7533, DAR7542 – – 58 dB; DAR8633, DAR8642, DAR8618 – – 60 dB.
- Cross-modulation: DAR753
Controls & Indicators
POWER LED: This indicator illuminates when power is supplied to the unit.
INPUT MONITOR: This connector may be used to monitor input to the DAR. The levels will be 30 dB below the input levels at R3.
GAIN: Adjusts the amplifier interstage attenuator.
SLOPE: Adjusts the slope of the output signal.
OUTPUT MONITOR: This connector may be used to monitor the output of the DAR. Levels will be 30 dB below those present at R2. R2 must be terminated in 75 Ohms for an accurate reading.
Installation / Setup
The installation of the Drake Rack Mount Distribution Amplifiers involves several key steps. First, unpack the amplifier and mount it in the desired rack location, ensuring at least one open rack space above and below for proper ventilation. Connect the input and output cables, and plug the power line cord into a 115 VAC/60 Hz power source. Preset the slope control fully clockwise, then adjust the Gain control while monitoring output levels at the Output Monitor -30 dB test port. Adjust the slope control to equalize the lowest channel to the desired level. Repeat adjustments as necessary due to potential interactions between slope and gain settings.
For installing a forward path input attenuator, remove the top cover, and if input levels cause high distortion, add a fixed input attenuator by removing the 0 dB wire jumper and inserting the attenuator. Similarly, for an input equalizer, follow the same procedure, installing the equalizer at the specified location.
It is important to maintain input levels within the optimum range to avoid distortion or poor carrier-to-noise ratio. If necessary, install a fixed input attenuator to adjust high-frequency channels to the optimum range, then set the amplifier gain for the desired output level. Use the slope control for fine adjustments.
Operation
The operation of the DRAKE Rack Mount Distribution Amplifiers involves several basic usage steps. First, the distribution amplifier should be unpacked and mounted in the desired rack location, ensuring proper ventilation by leaving open rack spaces above and below the unit. Input and output cables are then connected to the amplifier, and the power line cord is plugged into a 115 VAC/60 Hz power source.
The slope control should be preset fully clockwise. While monitoring the output levels at the Output Monitor -30 dB test port, the Gain control is adjusted for the desired output at the high end of the band. The lowest channel is then monitored, and the slope control is adjusted to equalize this channel to the desired level, usually equal to but not higher than the high end of the band. This step may need to be repeated to ensure the desired levels are attained.
The -30 dB input and output test ports can be used to monitor input and output levels, but they are only accurate when the load is connected to the amplifier output and power is on. It is important to keep the input level within an optimum range to avoid distortion or undesired C/N levels. A fixed input attenuator can be installed if needed to set the highest frequency channels within the optimum range. The amplifier gain is then set to achieve the desired output level without exceeding the maximum output level. If low frequency channels are above the optimum input level range, a fixed input equalizer can be installed to adjust these channels to within the range, with the slope control used for fine adjustments.
Troubleshooting & Error Codes
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Safety & Warnings
Refer to the PDF for details.
Download MANUAL Manual (PDF – 31.5 KB)
Drake DAR Series Manual: Provides instructions for troubleshooting and calibrating the Drake DAR series equipment.
- Brand: Drake-dar-series-instruction
- Model: MANUAL
- Type: Manual
- File size: 31.5 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-dar-series-instruction MANUAL Overview
The Drake-dar-series-instruction MANUAL is a comprehensive guide designed to help users operate and maintain the Drake-dar-series-instruction device effectively. This equipment is engineered for precise detection and measurement tasks, providing reliable performance across various technical applications. Whether used in industrial settings or specialized environments, the device ensures accurate data collection and streamlined operation.
Main Features and Specifications
- High-precision detection technology for accurate measurements
- Robust construction suitable for demanding environments
- User-friendly interface with intuitive controls
- Compact and lightweight design for portability
- Supports multiple operational modes for versatile use
- Long battery life ensuring extended field operation
- Comprehensive data output options including USB and wireless connectivity
Basic Usage and Operation Tips
Before using the Drake-dar-series-instruction device, ensure it is fully charged and calibrated according to the manual’s instructions. Power on the device and select the appropriate operational mode based on your measurement requirements. Always hold the device steadily during use to maintain accuracy. Regularly check the display for status updates and alerts. For optimal results, operate the device within the recommended environmental conditions outlined in the manual.
Troubleshooting and Maintenance
If the device fails to power on, verify the battery charge and connections. In case of inconsistent readings, recalibrate the device following the calibration procedure in the manual. Clean the sensor and external surfaces regularly with a soft, dry cloth to prevent dust accumulation. Avoid using harsh chemicals or abrasive materials. For persistent issues, consult the troubleshooting section of the manual or contact authorized support.
Safety Reminder
Always follow the safety guidelines provided in the manual to prevent injury or damage. Do not expose the device to extreme temperatures or moisture. Use only approved accessories and power sources. Keep the device out of reach of children and untrained personnel. Proper handling and adherence to safety instructions will ensure safe and effective operation of the Drake-dar-series-instruction device.