The Drake WH-7 Wattmeter manual provides detailed instructions for installation, operation, and troubleshooting of the wattmeter, including how to properly set up the device between a transmitter and antenna using PL-259 coax connectors and how to perform alignment procedures for accurate power measurements. It also includes maintenance advice, such as diode replacement and calibration adjustments, to ensure the device functions correctly and provides accurate readings.

• Brand: Drake
• Model: MANUAL
• Type: service manual
• File size: 813.6 KB

Manual Overview

The Drake WH-7 Wattmeter service manual provides detailed instructions for troubleshooting, calibration, and maintenance of the device. The WH-7 is a through-line wattmeter designed to measure forward and reverse power within a frequency range of 1.8-30 MHz, with a line impedance of 50 Ohms. The wattmeter’s accuracy varies by scale: 5% of reading plus additional wattage on 20, 200, and 2000 watts scales. The manual emphasizes the importance of using the same type of diode rectifiers for replacements to maintain accuracy. Calibration involves adjusting the internal coupler, which is preset at the factory, and requires precision equipment for alignment. The process includes null adjustment and forward power calibration across different wattage scales using a 50 Ohm dummy load and an RF voltmeter. Maintenance is minimal due to the passive design, but any unresolved issues should be directed to the R. L. Drake Service Department. The manual also includes guidance on the installation of the removable coupler and the importance of using appropriate connectors.

Quick Issues Covered

• Diagnose diode rectifier issues affecting wattmeter accuracy.
• Calibrate forward power using precise voltage measurements.
• Trace circuits using WH7 schematic for troubleshooting.

Overview

The Drake Model WH-7 Wattmeter is a through line wattmeter designed to accurately measure forward and reverse power. It features a removable RF coupler for convenient placement at the transmitter’s output. The manual covers installation, maintenance, and alignment procedures for the device.

Specifications

• FREQUENCY COVERAGE: 1.8-30 MHz.
• LINE IMPEDANCE: 50 Ohms resistance.
• ACCURACY: Wattmeter accuracy is ++ (5% of reading + 0.2 watts) on 20 watts scale, + (5% of reading + 2 watts) on 200 watts scale, and + (5% of reading + 20 watts) on 2000 watts scale, throughout the range of 1.8—30 MHz.
• VSWR INSERTION: Insertion of wattmeter in line changes VSWR no more than 1.05:1.
• POWER CAPABILITY: 2000 Watts RF continuous duty.
• FRONT PANEL: Range Selector Switch.
• REMOVABLE COUPLER: Two input and output connectors (SO 239). Three range calibration potentiometers. One .5 to 5 pf piston trimmer null adjustment.
• MAIN CABINET: 554,” highx 67%” wide, 7” cabinet depth (13.5 cm h, 17.5 cm w, 19 cm d).
• REMOVABLE COUPLER: 2%” high, 334” wide, 234” deep.
• WEIGHT: 2% Ibs. (1.25 kG)

Controls & Indicators

Range Selector Switch.

Installation / Setup

Carefully remove the WH-7 Wattmeter from the shipping carton and check for any damage. If damaged, notify the transportation company and keep the carton and packing materials for inspection. Fill out and return the registration card to validate the warranty. Install the wattmeter between the transmitter (or amplifier) and the antenna using PL-259 coax connectors with the SO 239 receptacles. The sensing element is removable and can be installed behind the operating table to avoid bulky coax cables. Approximately 3 feet of cable connects the sensing element to the meter, allowing flexible installation.

Operation

Refer to the PDF for details.

Troubleshooting & Error Codes

Refer to the PDF for details.

Safety & Warnings

Refer to the PDF for details.

Download MANUAL Service manual (PDF – 813.6 KB)

Drake-wh-7-instruction-service MANUAL: A technician's guide for troubleshooting and calibrating the Drake-wh-7 model. PDF size: 813.6 KB.

• Brand: Drake-wh-7-instruction-service
• Model: MANUAL
• Type: Service manual
• File size: 813.6 KB

Overview

Brief overview of the product.

Specifications

• Key spec 1
• Key spec 2

Controls & Indicators

Control panel/button layout.

Installation / Setup

1. Step 1…
2. Step 2…

Operation

Basic usage, modes, cycles.

Troubleshooting & Error Codes

Safety & Warnings

• Important warning…

Downloads

Download MANUAL service manual (PDF)

Quick reference for Drake 1. Use the embedded PDF for full procedures, diagrams and error codes.

• Brand: Drake
• Model: 1
• Type: service manual
• File size: 1.9 MB

Download 1 Service manual (PDF – 1.9 MB)

Drake WH-7 Model 1 Service Manual PDF: 1.9 MB. Guide for troubleshooting, calibrating, and assembling the device efficiently.

• Brand: Drake-wh-7-instruction-service-manual-2
• Model: 1
• Type: Service manual
• File size: 1.9 MB

Overview

Brief overview of the product.

Specifications

• Key spec 1
• Key spec 2

Controls & Indicators

Control panel/button layout.

Installation / Setup

1. Step 1…
2. Step 2…

Operation

Basic usage, modes, cycles.

Troubleshooting & Error Codes

Safety & Warnings

• Important warning…

Downloads

Download 1 service manual (PDF)

Quick reference for Drake SCHEMATICS. Use the embedded PDF for full procedures, diagrams and error codes.

• Brand: Drake
• Model: SCHEMATICS
• Type: manual
• File size: 45.7 KB

Download SCHEMATICS Manual (PDF – 45.7 KB)

Drake-wh-7 SCHEMATICS manual aids technicians in troubleshooting and assembling electrical systems. File size: 45.7 KB.

• Brand: Drake-wh-7
• Model: SCHEMATICS
• Type: Manual
• File size: 45.7 KB

Overview

Brief overview of the product.

Specifications

• Key spec 1
• Key spec 2

Controls & Indicators

Control panel/button layout.

Installation / Setup

1. Step 1…
2. Step 2…

Operation

Basic usage, modes, cycles.

Troubleshooting & Error Codes

Safety & Warnings

• Important warning…

Downloads

Download SCHEMATICS manual (PDF)

The Drake WH-7 Wattmeter manual provides detailed instructions for installation, operation, and troubleshooting, including how to set up the device between the transmitter and antenna, and how to measure VSWR and power accurately. It also includes maintenance tips and alignment procedures to ensure the wattmeter functions correctly, with guidance on diode replacement and calibration of power ranges.

• Brand: Drake
• Model: 2
• Type: service manual
• File size: 647.5 KB

Manual Overview

The Drake WH-7 Wattmeter is a through-line device designed for accurate measurement of forward and reverse power in RF applications. It operates within a frequency range of 1.8-30 MHz and supports a line impedance of 50 Ohms. The wattmeter offers three power measurement ranges: 20, 200, and 2000 watts, with specific accuracy levels for each range. Installation involves placing the wattmeter between the transmitter and antenna, using standard PL-259 coax connectors. The removable coupler allows flexible installation positions.

For troubleshooting, the manual emphasizes the importance of maintaining factory settings unless precision equipment is available. Diode replacement should be done with identical types to ensure accuracy. Calibration involves using a 50 Ohm dummy load and an RF voltmeter to adjust the calibration potentiometers for each power range. The null adjustment is performed by minimizing reflected power using a piston trimmer. The manual advises against unauthorized adjustments and recommends contacting R.L. Drake’s service department for unresolved issues.

Quick Issues Covered

• Diagnose diode rectifier malfunctions and replacement procedures.
• Calibrate forward power with specific voltage and pot adjustments.
• Trace circuits using detailed WH7 schematic for troubleshooting.

Overview

The WH7 Wattmeter by Drake is a through-line wattmeter designed to accurately measure forward and reverse power. It covers a frequency range of 1.8-30 MHz and is capable of handling up to 2000 watts RF continuous duty. The wattmeter features a removable RF coupler for convenient installation at the transmitter’s output. It includes a range selector switch on the front panel and provides three power measurement ranges: 20, 200, and 2000 watts. The manual covers installation, operation, and maintenance procedures, including instructions for unpacking, setting up, and aligning the device.

Specifications

• FREQUENCY COVERAGE: 1.8-30 MHz
• LINE IMPEDANCE: 50 Ohms resistance
• ACCURACY: Wattmeter accuracy is -+ (5% of reading + 0.2 watts) on 20 watts scale, = (5% of reading + 2 watts) on 200 watts scale, and = (5% of reading + 20 watts) on 2000 watts scale, throughout the range of 1.8-30 MHz
• VSWR INSERTION: Insertion of wattmeter in line changes VSWR no more than 1.05:1
• POWER CAPABILITY: 2000 Watts RF continuous duty
• FRONT PANEL: Range Selector Switch
• REMOVABLE COUPLER: Two input and output connectors (SO 239). Three range calibration potentiometers. One .5 to 5 pf piston trimmer null adjustment
• MAIN CABINET: 3.5" high x 6.5" wide, 7" cabinet depth (13.5 cm h, 17.5 cm w, 19 cm d)
• REMOVABLE COUPLER: 2.25" high, 3.75" wide, 2.5" deep
• WEIGHT: 2.4 lbs. (1.25 kg)

Controls & Indicators

Range Selector Switch.

Installation / Setup

The WH-7 Wattmeter should be installed between the output of the transmitter (or amplifier) and the antenna. It uses ordinary PL-259 coax connectors to couple with the SO 239 receptacles on the sensing element. The sensing element is removable for convenience and can be installed behind the operating table to avoid bringing bulky coax cables up. Approximately 3 feet of cable connects the sensing element to the meter, allowing for flexible installation positions.

Operation

The WH-7 Wattmeter allows for VSWR and power measurements. For VSWR measurements, set the selector switch to ‘SET’, adjust the ‘VSWR SET’ control to align the meter pointer with ‘SET’ at full scale, then switch to ‘VSWR’ to read the value directly. For power measurements, use the selector switch to choose between 20, 200, and 2000 watts full scale, ensuring the meter does not exceed full scale. The wattmeter measures forward and reflected power, and radiated power can be calculated using the supplied SWR calculator.

Troubleshooting & Error Codes

Refer to the PDF for details.

Safety & Warnings

Refer to the PDF for details.

Download 2 Service manual (PDF – 647.5 KB)

Drake WH-7 Model 2 Service Manual PDF: Guide for troubleshooting, calibrating, and assembling. File size: 647.5 KB.

• Brand: Drake-wh-7-instruction-service-manual
• Model: 2
• Type: Service manual
• File size: 647.5 KB

Overview

Brief overview of the product.

Specifications

• Key spec 1
• Key spec 2

Controls & Indicators

Control panel/button layout.

Installation / Setup

1. Step 1…
2. Step 2…

Operation

Basic usage, modes, cycles.

Troubleshooting & Error Codes

Safety & Warnings

• Important warning…

Downloads

Download 2 service manual (PDF)

The manual for Drake LIST provides a comprehensive guide for the setup, operation, and troubleshooting of the equipment, detailing spare parts with their descriptions, part numbers, and prices. It also includes specific instructions for ordering parts, noting that prices are subject to change and that a handling charge applies to orders not exceeding $15.00.

• Brand: Drake
• Model: LIST
• Type: manual
• File size: 83.8 KB

Manual Overview

The Drake LIST manual provides detailed guidance for troubleshooting, diagnostics, and calibration of the device. It emphasizes a systematic approach to troubleshooting, starting with identifying error codes and diagnostics to pinpoint issues. Technicians are advised to use the error codes as a primary tool for diagnosing faults, which can then guide further investigation into specific components or sections of the device. Calibration and adjustments are crucial for maintaining device accuracy and performance. The manual includes procedures for calibrating key components, such as meters and trimmers, ensuring they operate within specified parameters. For board-level troubleshooting, the manual offers guidance on identifying and replacing faulty components, such as diodes and resistors, with emphasis on using the correct part numbers and specifications. The manual also provides a spare parts list with part numbers and descriptions, facilitating quick identification and ordering of necessary components. It is important to note that prices are subject to change, and a handling charge applies to orders below a certain threshold.

Quick Issues Covered

• Diagnostics for power-up failures using specific part replacements.
• Error codes related to faulty diodes and switches.
• Calibration adjustments using trimmer and meter components.

Overview

Refer to the PDF for details.

Specifications

Refer to the PDF for details.

Controls & Indicators

Refer to the PDF for details.

Installation / Setup

Refer to the PDF for details.

Operation

Refer to the PDF for details.

Troubleshooting & Error Codes

Refer to the PDF for details.

Safety & Warnings

Refer to the PDF for details.

Download LIST Manual (PDF – 83.8 KB)

Drake-w-4-parts LIST manual: assists technicians in troubleshooting and assembling components. File size: 83.8 KB.

• Brand: Drake-w-4-parts
• Model: LIST
• Type: Manual
• File size: 83.8 KB

Overview

Brief overview of the product.

Specifications

• Key spec 1
• Key spec 2

Controls & Indicators

Control panel/button layout.

Installation / Setup

1. Step 1…
2. Step 2…

Operation

Basic usage, modes, cycles.

Troubleshooting & Error Codes

Safety & Warnings

• Important warning…

Downloads

Download LIST manual (PDF)

The Drake W-4 Wattmeter manual provides detailed instructions for installation, operation, and maintenance, including how to measure forward, reflected, and radiated power, as well as VSWR measurements. It also covers troubleshooting steps, such as diode replacement and alignment procedures, while emphasizing the importance of proper maintenance to ensure long-term functionality.

• Brand: Drake
• Model: MANUAL
• Type: manual
• File size: 2.1 MB

Manual Overview

The Drake W-4 Wattmeter manual provides detailed instructions for installation, operation, and maintenance, focusing on troubleshooting and calibration processes. The wattmeter measures forward and reverse RF power with accuracy specifications of ±(5% of reading + 2 Watts) on the 200 Watts scale and ±(5% of reading + 20 Watts) on the 2000 Watts scale. For troubleshooting, the manual suggests checking the diode rectifiers, specifically the 1N295 diodes, which should only be replaced with identical types to maintain accuracy. Calibration involves using a 50 Ohm dummy load and an accurate RF voltmeter, with adjustments made at 14.00 MHz. The internal coupler adjustments are factory-set and should not be altered without precision laboratory equipment. The manual emphasizes the importance of proper maintenance and provides contact information for the R. L. Drake Service Department for issues that cannot be resolved independently. Additionally, the manual includes guidance on using the nomograph for VSWR measurements and details on calculating radiated power by subtracting reverse power from forward power readings.

Quick Issues Covered

• Diagnose power-up failures using range selector switch settings.
• Identify error codes related to diode rectifier malfunctions.
• Trace circuit using detailed schematics for alignment procedures.

Overview

The DRAKE Model W-4 Wattmeter is a through-line wattmeter designed to accurately measure forward and reverse power. It features a removable RF coupler for convenient placement at the transmitter’s output. The wattmeter covers a frequency range of 1.8 to 54 MHz, with a line impedance of 50 Ohms. It offers an accuracy of ±(5% of reading + 2 Watts) on the 200 Watts scale and ±(5% of reading + 20 Watts) on the 2000 Watt scale. The device can handle up to 2000 Watts RF continuous duty. The front panel includes a range selector switch, and the removable coupler has input and output connectors, calibration potentiometers, and a piston trimmer for null adjustment. The manual covers installation, operation, and maintenance instructions, including VSWR and power measurements, and provides guidance on service and diode replacement.

Specifications

• FREQUENCY COVERAGE. 1.8 – 54 MHz.
• LINE IMPEDANCE. 50 Ohms resistance.
• ACCURACY. Wattmeter accuracy is + (5% of reading + 2 Watts) on 200 Watts scale, and + (5% of reading + 20 Watts) on 2000 Watt scale throughout the range of 1.8 – 54 MHz.
• VSWR INSERTION. Insertion of wattmeter in line changes VSWR no more than 1.05:1.
• POWER CAPABILITY. 2000 Watts RF continuous duty.
• CONTROLS AND JACKS
• FRONT PANEL. Range Selector Switch.
• REMOVABLE COUPLER. Two input and output connectors (SO 239). Four range calibration potentiometers. One .5 to 5 pf piston trimmer null adjustment.
• DIMENSIONS
• MAIN CABINET. 6” high, 3-11/16” wide, 4” cabinet depth, 5” overall length.
• REMOVABLE COUPLER. 2-1/2” high, 3-3/8” wide, 2-3/4" deep.

Controls & Indicators

The front-panel control present is a Range Selector Switch.

Installation / Setup

The W-4 Wattmeter should be installed between the output of the transmitter (or amplifier) and the antenna. Use ordinary PL-259 coax connectors to couple with the SO 239 receptacles on the sensing element. The sensing element is removable and can be installed behind the operating table to avoid bulky coax cables being brought up. Approximately 3 feet of cable connects the sensing element to the meter, allowing flexibility in installation positions.

Operation

VSWR measurements can be made using the nomograph supplied with the W-4 Wattmeter. The nomograph can be stored in the gap between the main chassis and the outer case of the Wattmeter. For power measurements, the W-4 indicates three types of power: forward, reflected, and radiated. In the “forward” position, the meter reads the sum of radiated and reflected power. In the “reverse” position, it reads reflected power. Radiated power is determined by subtracting the “reverse” power reading from the “forward” power reading.

Troubleshooting & Error Codes

Refer to the PDF for details.

Safety & Warnings

Refer to the PDF for details.

Download MANUAL Manual (PDF – 2.1 MB)

Drake-w-4-instruction MANUAL PDF (2.1 MB): Guides technicians in troubleshooting and calibrating the Drake-w-4 model.

• Brand: Drake-w-4-instruction
• Model: MANUAL
• Type: Manual
• File size: 2.1 MB

Overview

Brief overview of the product.

Specifications

• Key spec 1
• Key spec 2

Controls & Indicators

Control panel/button layout.

Installation / Setup

1. Step 1…
2. Step 2…

Operation

Basic usage, modes, cycles.

Troubleshooting & Error Codes

Safety & Warnings

• Important warning…

Downloads

Download MANUAL manual (PDF)

The Drake Model W-4 Wattmeter manual provides detailed instructions for setup, operation, and troubleshooting, including installation between the transmitter and antenna, and guidance on measuring forward, reflected, and radiated power. It also includes alignment procedures for accurate power readings and maintenance tips, such as diode replacement and ensuring proper calibration using specific equipment.

• Brand: Drake
• Model: MANUAL
• Type: service manual
• File size: 1.8 MB

Manual Overview

The Drake Model W-4 Wattmeter is a through-line wattmeter designed to measure forward and reverse RF power accurately across a frequency range of 1.8 to 54 MHz, with a line impedance of 50 Ohms. It features a removable RF coupler for convenient installation at the transmitter’s output. The wattmeter’s accuracy is within ±5% of the reading plus 2 Watts on the 200 Watts scale, and ±5% of the reading plus 20 Watts on the 2000 Watts scale. For troubleshooting, the manual emphasizes the importance of using the correct diodes (1N295) to maintain accuracy. Calibration involves adjusting the null and forward/reverse power settings using specific potentiometers and a piston trimmer. The alignment procedure requires precision equipment and involves setting the wattmeter at specific power levels and voltages to ensure accurate readings. Maintenance is minimal due to the passive nature of the device, but any significant issues should be addressed by contacting the R. L. Drake Service Department. The manual also includes a VSWR nomograph for easy measurement of standing wave ratios.

Quick Issues Covered

• Diagnose diode failures with specific 1N295 replacement guidance.
• Calibrate forward power using RF voltmeter at 70.7V RMS.
• Trace circuit using removable coupler for easy access to PCB.

Overview

The DRAKE Model W-4 Wattmeter is a through-line wattmeter designed to accurately measure forward and reverse power. It features a removable RF coupler for convenient placement at the transmitter’s output. The wattmeter covers frequencies from 1.8 to 54 MHz with a line impedance of 50 Ohms and an accuracy of ±(5% of reading + 2 Watts) on the 200 Watts scale, and ±(5% of reading + 20 Watts) on the 2000 Watts scale. It has a power capability of 2000 Watts RF continuous duty and includes controls such as a range selector switch and calibration potentiometers. The manual covers installation, operation, maintenance, and alignment procedures for the wattmeter.

Specifications

• FREQUENCY COVERAGE. 1.8 – 54 MHz.
• LINE IMPEDANCE. 50 Ohms resistance.
• ACCURACY. Wattmeter accuracy is + (5% of reading + 2 Watts) on 200 Watts scale, and + (5% of reading + 20 Watts) on 2000 Watt scale throughout the range of 1.8 – 54 MHz.
• VSWR INSERTION. Insertion of wattmeter in line changes VSWR no more than 1.05:1.
• POWER CAPABILITY. 2000 Watts RF continuous duty.
• FRONT PANEL. Range Selector Switch.
• REMOVABLE COUPLER. Two input and output connectors (SO 239). Four range calibration potentiometers. One .5 to 5 pf piston trimmer null adjustment.
• MAIN CABINET. 6” high, 3-11/16” wide, 4" cabinet depth, 5” overall length.
• REMOVABLE COUPLER. 2-1/2” high, 3-3/8" wide, 2-3/4” deep.

Controls & Indicators

Range Selector Switch

Installation / Setup

The installation of the DRAKE Model W-4 Wattmeter involves placing the unit between the output of the transmitter (or amplifier) and the antenna. It uses ordinary PL-259 coax connectors to couple with the SO 239 receptacles on the sensing element. The sensing element is removable for convenience and can be installed in a location that minimizes the need for bulky coax cables. Approximately 3 feet of cable connects the sensing element to the meter, allowing flexibility in installation positions.

Operation

The operation of the DRAKE Model W-4 Wattmeter involves making VSWR and power measurements. VSWR measurements can be easily conducted using the supplied nomograph, which can be stored between the main chassis and the outer case of the wattmeter. For power measurements, the wattmeter reads different types of power: forward, reflected, and radiated. In the “forward” position, it measures the sum of radiated and reflected power, while in the “reverse” position, it measures reflected power. Radiated power is determined by subtracting the “reverse” power reading from the “forward” power reading.

Troubleshooting & Error Codes

Refer to the PDF for details.

Safety & Warnings

Refer to the PDF for details.

Download MANUAL Service manual (PDF – 1.8 MB)

Drake-w-4-instruction-service MANUAL PDF: 1.8 MB. Guide for technicians on troubleshooting and calibrating Drake W-4 equipment.

• Brand: Drake-w-4-instruction-service
• Model: MANUAL
• Type: Service manual
• File size: 1.8 MB

Overview

Brief overview of the product.

Specifications

• Key spec 1
• Key spec 2

Controls & Indicators

Control panel/button layout.

Installation / Setup

1. Step 1…
2. Step 2…

Operation

Basic usage, modes, cycles.

Troubleshooting & Error Codes

Safety & Warnings

• Important warning…

Downloads

Download MANUAL service manual (PDF)

The manual for the Drake VMM860AG/VMM860AS video modulators covers setup and operation, including details on connecting standard audio/video sources, adjusting output levels, and selecting channels via front panel controls. It also provides troubleshooting information, such as indicators for power and error conditions, and instructions for obtaining warranty service if defects are discovered.

• Brand: Drake
• Model: MANUAL
• Type: manual
• File size: 171.5 KB

Manual Overview

The Drake VMM860AG and VMM860AS video modulators are part of a modular headend system designed for efficient rack space utilization. These units support a range of standard audio/video sources and offer frequency agility with front panel switch selection for CATV and VHF/UHF channels. Troubleshooting involves monitoring the POWER/ERROR indicator; a flashing light signals an invalid channel setting or operational error, which disables RF output. Calibration includes adjusting audio and video levels via front panel controls, with the audio level affecting aural carrier deviation and video level impacting visual carrier modulation. The A/V ratio can be fine-tuned using a screwdriver adjustment to set the aural carrier level relative to the visual carrier. For diagnostics, ensure connections and settings align with specifications, such as maintaining a 75 Ohm impedance and checking for spurious outputs within acceptable limits. The VMM860AS model includes additional BTSC stereo audio capabilities, with a built-in stereo encoder and pre-emphasis options for compatibility with stereo signals.

Quick Issues Covered

• Diagnose power-up failures with the POWER/ERROR indicator.
• Adjust audio level using front panel AUDIO Level Control.
• Resolve invalid channel settings causing flashing ERROR indicator.

Overview

Refer to the PDF for details.

Specifications

• Frequency Range: 54 to 864 MHz; Standard, HRC, or IRC CATV channels 2 to 135, Broadcast TV channels 2 to 69.
• FCC Frequency Offsets: Automatic (+12.5 kHz, +25 kHz, or none as required).
• Output level: +45 dBmV minimum (10 dB adjustment range).
• Output Impedance: 75 Ohms, 8 dB return loss.
• A/V Ratio: Audio carrier level, adjustable from -22 to -12 dB referenced to video carrier level.
• Frequency Stability: Within +5 kHz
• Output Flatness: From 54 to 864 MHz, less than 3 dB change.
• Output Amplitude Stability: +1 dB
• Intercarrier Frequency: 4.5 MHz
• Spurious Outputs (5 to 900 MHz): -60 dBc, (-15 dB A/V ratio and output level of +45 dBmV).
• In-Channel C/N: 65 dB typical, 4 MHz bandwidth.
• Broadband Noise: -78 dBc typical, 4 MHz bandwidth @ +45 dBmV output.
• Input Level for 87.5% Modulation: 0.65 Vp-p to 1.5 Vp-p. Gain adjust with front panel control.
• Video Over-modulation LED: Trips at 87.5 % depth of modulation. (VMM860AS only)
• Input Impedance: 75 Ohms, return loss of 26 dB minimum.
• Frequency Response: 20 Hz to 4.2 MHz, +1 dB.
• C/L Delay: Within 50 nSec. of FCC predistortion.
• Differential Gain: 3% maximum (10 to 90% APL).
• Differential Phase: 3° maximum (10 to 90% APL).
• Input Level for +/- 25 kHz Deviation: 125 mV rms to 2.5 V rms. Manual gain adjust with front panel control.
• Input Impedance: Greater than 10 K Ohms, unbalanced.
• Pre-emphasis: 75 uSec. normal, defeatable (flat) by rear panel switch for BTSC baseband stereo compatibility.
• Frequency Response: 40 Hz to 15 kHz, +1.0 dB referenced to 75 uSec.

Controls & Indicators

The front-panel controls and indicators for the VMM860AG and VMM860AS video modulators include:

F1 – POWER/ERROR Indicator: Lights when connected to the required DC power source. Flashes to indicate an invalid channel setting or other conditions causing the unit to operate on an invalid channel, with the RF output switched off during flashing.

F2 – AUDIO Level Control: A screwdriver adjustment that determines the aural carrier deviation, with clockwise rotation increasing the deviation.

F3 – VIDEO Level Control: A screwdriver adjustment for setting the video input level.

F6 – A/V Ratio Control: A screwdriver adjustment that varies the level of the aural carrier over a range from 12 to 22 dB below the visual carrier.

Installation / Setup

Refer to the PDF for details.

Operation

Refer to the PDF for details.

Troubleshooting & Error Codes

Refer to the PDF for details.

Safety & Warnings

Refer to the PDF for details.

Download MANUAL Manual (PDF – 171.5 KB)

Drake-vmm860as-ag-instruction MANUAL: Guide for technicians to troubleshoot and calibrate the VMM860AS model. File size: 171.5 KB.

• Brand: Drake-vmm860as-ag-instruction
• Model: MANUAL
• Type: Manual
• File size: 171.5 KB

Overview

Brief overview of the product.

Specifications

• Key spec 1
• Key spec 2

Controls & Indicators

Control panel/button layout.

Installation / Setup

1. Step 1…
2. Step 2…

Operation

Basic usage, modes, cycles.

Troubleshooting & Error Codes

Safety & Warnings

• Important warning…

Downloads

Download MANUAL manual (PDF)

The manual for the Drake VMM860AG Video Modulator provides detailed instructions on setting up and operating the device, including selecting CATV or VHF/UHF TV channels and adjusting audio and video levels using front panel controls. It also covers troubleshooting procedures for common issues, such as invalid channel settings indicated by a flashing error light, and includes warranty information for service and repairs.

• Brand: Drake
• Model: MANUAL
• Type: manual
• File size: 139.0 KB

Manual Overview

The Drake VMM860AG Video Modulator manual provides detailed guidance for troubleshooting, diagnostics, and adjustments. The modulator features a front panel pushwheel switch for selecting CATV channels 2 through 135 or VHF/UHF TV channels 2 through 69, with automatic FCC frequency offsets. Troubleshooting involves checking the POWER/ERROR indicator, which lights up when connected to power. A flashing indicator suggests an invalid channel setting or other operational issues, causing the RF output to switch off. For error diagnostics, ensure correct channel settings and check for flashing conditions. Calibration involves adjusting the audio and video levels using front panel screwdriver controls. The audio level control adjusts the aural carrier deviation, while the video level control sets the video modulation level. The A/V ratio control allows fine-tuning of the audio carrier level relative to the video carrier. The manual emphasizes the importance of proper maintenance and correct setup to ensure optimal performance, with all level controls conveniently located on the front panel for easy access.

Quick Issues Covered

• Diagnose flashing POWER/ERROR indicator for invalid channel settings.
• Adjust audio and video levels using front panel controls.
• Calibrate A/V ratio with screwdriver adjustment on front panel.

Overview

The source does not provide a concise overview of the product and manual coverage.

Specifications

• Frequency Range: 54 to 864 MHz
• Output level: +45 dBmV minimum (10 dB adjustment range)
• Output Impedance: 75 Ohms, 8 dB return loss
• A/V Ratio: Audio carrier level, adjustable from -22 to -12 dB
• Frequency Stability: Within +5 kHz
• Intercarrier Frequency: 4.5 MHz
• Spurious Outputs (5 MHz to 1 GHz): -60 dBc
• In-channel C/N: 65 dB typical, 4 MHz bandwidth
• Broadband Noise: -78 dBc typical, 4 MHz bandwidth @ +45 dBmV output
• Input Level for 87.5% Modulation: 0.65 Vp-p to 1.5 Vp-p
• Input Impedance: 75 Ohms, return loss of 26 dB minimum
• Frequency Response: 20 Hz to 4.2 MHz, +1 dB
• C/L Delay: Within 50 nSec. of 0 nSec. (standard)
• Differential Gain: 3% maximum (10 to 90% APL)
• Differential Phase: 3° maximum (10 to 90% APL)
• Input Level for 25 kHz Peak Deviation: 125 mV rms to 2.5 V rms
• Input Impedance: Greater than 10 K Ohms, unbalanced
• Pre-emphasis: 75 uSec. normal, defeatable (flat) by rear panel switch
• Frequency Response: 40 Hz to 15 kHz, +1.0 dB referenced to 75 uSec. pre-emphasis curve
• S/N ratio: 65dB
• Total Harmonic Distortion: 1% maximum

Controls & Indicators

Refer to the PDF for details.

Installation / Setup

Refer to the PDF for details.

Operation

Refer to the PDF for details.

Troubleshooting & Error Codes

Refer to the PDF for details.

Safety & Warnings

Refer to the PDF for details.

Download MANUAL Manual (PDF – 139.0 KB)

Drake-vmm860ag-instruction MANUAL: Guide for technicians to troubleshoot and calibrate the VMM860AG model efficiently. File size: 139.0 KB.

• Brand: Drake-vmm860ag-instruction
• Model: MANUAL
• Type: Manual
• File size: 139.0 KB

Overview

Brief overview of the product.

Specifications

• Key spec 1
• Key spec 2

Controls & Indicators

Control panel/button layout.

Installation / Setup

1. Step 1…
2. Step 2…

Operation

Basic usage, modes, cycles.

Troubleshooting & Error Codes

Safety & Warnings

• Important warning…

Downloads

Download MANUAL manual (PDF)

The Drake VMM 600/VMM 860 Video Modulator System manual covers the setup and operation of the modular headend system, including installation instructions for rack mounting up to 12 modulators and adjusting output levels and A/V ratios. It also provides troubleshooting guidance for maintaining proper performance, emphasizing the importance of correct maintenance and repair to avoid defects not covered by the warranty.

• Brand: Drake
• Model: MANUAL
• Type: manual
• File size: 173.0 KB

Manual Overview

The Drake VMM 600/VMM 860 Video Modulator System manual provides detailed guidance on troubleshooting, diagnostics, and calibration for technicians. The system supports up to 12 modulators in a rack, with each unit capable of handling a wide range of audio and video inputs. Troubleshooting primarily involves checking connections and ensuring proper settings on the front panel controls, such as output level and A/V ratio adjustments. Error diagnostics are facilitated through front panel indicators and require verification of input levels and impedance. Calibration involves adjusting the output level, typically set at +45 dBmV, and ensuring frequency stability and spurious output levels are within specified limits. Board-level guidance includes maintaining proper ventilation and spacing between units to prevent overheating. The manual emphasizes the importance of using compatible parts and adhering to installation guidelines to avoid warranty voidance. The system is designed to work with standard NTSC video sources, with provisions for audio pre-emphasis adjustments to accommodate BTSC stereo signals.

Quick Issues Covered

• Diagnose power-up failures with +12V DC input check.
• Adjust RF output level using front panel controls.
• Identify error codes via detailed problem descriptions.

Overview

The R.L. Drake VMM 600/VMM 860 Video Modulator System is a professional quality, modular headend system designed to optimize rack space. It allows for up to 12 VMM 600 and/or VMM 860 modulators to be racked alongside a single power supply in a 12 position rack mount, or up to 4 modulators in a 4 position rack mount. The system is a high quality, fixed channel heterodyne audio/video modulator designed to accept standard audio/video sources such as NTSC video and audio baseband signals. The VMM 600 provides a modulated RF carrier output on any single VHF or specific cable channels, while the VMM 860 provides output on Hyperband or UHF channels. The system includes features such as adjustable output levels, field-defeatable audio pre-emphasis, and compatibility with BTSC encoded stereo audio signals.

Specifications

• Frequency Range: VMM600- 54-600 MHz, VMM860- 600-864 MHz
• Factory set channels: Cable Channels 1-86, 95-99, UHF-TV Channels 14-35, Cable Channels 87-135, UHF-TV Channels 36-69
• Output Level: +45 dBmV, minimum, adjustable over a 12 dB range
• Output Impedance: 75 Ohms, return loss of 12 dB
• Frequency Stability: +5 kHz (Visual Carrier)
• Intercarrier Frequency: 4.5 MHz, +50 Hz
• Spurious Outputs: -65 dBc, measured at -15 dB A/V ratio
• Broadband Noise: -95 dBc, referenced to video carrier
• DC Power Input: +12 VDC @ 150 to 220 mA, channel dependent
• Operating Temperature: 0°C to +50°C
• Size: 1"W x 3.5"H x 7.5"D
• Weight: 11 oz.

Controls & Indicators

The source does not provide specific information about the front-panel controls/indicators.

Installation / Setup

Refer to the PDF for details.

Operation

Refer to the PDF for details.

Troubleshooting & Error Codes

“”

Safety & Warnings

Refer to the PDF for details.

Download MANUAL Manual (PDF – 173.0 KB)

Drake-vmm860-instruction MANUAL: Guide for technicians to troubleshoot and calibrate the VMM860 model. File size: 173.0 KB.

• Brand: Drake-vmm860-instruction
• Model: MANUAL
• Type: Manual
• File size: 173.0 KB

Overview

Brief overview of the product.

Specifications

• Key spec 1
• Key spec 2

Controls & Indicators

Control panel/button layout.

Installation / Setup

1. Step 1…
2. Step 2…

Operation

Basic usage, modes, cycles.

Troubleshooting & Error Codes

Safety & Warnings

• Important warning…

Downloads

Download MANUAL manual (PDF)