The Drake 2-A manual provides detailed instructions for setting up, operating, and troubleshooting the communication receiver, including guidance on power requirements, antenna connections, and muting options. It also includes specific corrections and alignment procedures for optimal performance across various frequency bands, ensuring accurate frequency readings and stable operation.
Manual Overview
The Drake 2-A communication receiver manual provides detailed guidance for technicians focusing on troubleshooting, diagnostics, calibration, and board-level adjustments. Troubleshooting involves checking oscillator operation using a vacuum tube voltmeter (VTVM) on pin 9 of the 6U8 tube, ensuring negative voltage is observed across specific bands. For error diagnostics, the manual specifies corrections for component references, such as capacitor and resistor values, and tube designations, ensuring accurate maintenance and repair. Calibration involves aligning the crystal oscillator for optimal performance on various bands, adjusting coils like L9 for maximum negative voltage on the VTVM. Board-level guidance includes schematic corrections, such as reversing resistor connections and updating component values. The manual emphasizes the importance of precise adjustments to maintain the receiver’s performance, including frequency stability and selectivity, which are critical for effective communication reception across amateur transmission modes.
Quick Issues Covered
- Diagnose crystal oscillator issues using VTVM on 6U8 pin 9.
- Correct capacitor and resistor mislabeling in schematics for accurate tracing.
- Calibrate 20m, 15m, and 10m bands by adjusting L9 and L11.
Overview
The DRAKE 2-A is a versatile communication receiver designed for amateur transmissions, featuring a triple conversion superheterodyne design with crystal-controlled oscillators. It offers front panel controls for various functions, including bandwidth and detector type, and supports optional equipment like a Q-Multiplier. The receiver includes separate detectors for AM, CW, or SSB, and provides accurate frequency readings with a direct reading slide rule dial. It operates on 105 to 125 volts AC, consumes 40 watts, and requires a 4-ohm speaker. The antenna input impedance is 50 to 75 ohms, and the receiver supports external muting for smoother operation with transmitters.
Specifications
- MODEL: 2-A
- TYPE: Communication Receiver
- CONVERSION: Triple conversion superheterodyne
- OSCILLATORS: Crystal controlled high frequency oscillators
- IF FREQUENCY: 50 Ke
- BANDWIDTH CONTROL: Front panel control
- AVC: Amplified, delayed action
- DIAL: 7 inch slide rule dial
- DETECTORS: Separate detectors for AM, CW, SSB
- OPERATING RANGE: Twelve 600 kc segments between 3.5 and 30 mc
- MODE: Selectable Single Sideband, Amplitude Modulation, CW
- SELECTIVITY: 2.4 kc at 6 db down, 8.5 kc at 60 db down or 4.8 kc at 6 db down, 23 kc at 60 db down
- SPURIOUS RESPONSES: Image rejection more than 60 db; IF rejection more than 60 db
- FREQUENCY STABILITY: Less than 500 cycles warm up; less than 100 cycles after warm up
- DIAL CALIBRATION: 10 kc main dial division; approximately 1 kc vernier dial divisions
- SENSITIVITY: Less than 1/2 microvolt for 10 db signal to noise
- AUDIO OUTPUT: One watt maximum, .2 watt at AVC threshold
- AUDIO DISTORTION: Less than 3% harmonic, less than 1/2 % intermodulation
- TUBES: 6BZ6 RF Amplifier; 6U8 crystal controlled 1st mixer; 6BE6 VFO controlled 2nd converter; 6BE6 fixed frequency 3rd converter; 6BA6 50 kc IF amplifier; 6BE6 Product Detector and BFO; 6BN8 1st audio amplifier, bias rectifier and AM noise limiter; 6AQ5 audio output; 6BF6 AVC Amplifier-Diode detector- and AVC rectifier; 6X4 Rectifier
- POWER CONSUMPTION: 40 watts, 120 volts 60 cycle AC
- DIMENSIONS: 12" wide X 7" high X 9" deep
- WEIGHT: 14.5 pounds
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
The Drake 2-A communication receiver requires a power supply of 105 to 125 volts at 60 cycles AC and consumes 40 watts. It should be connected to a good quality permanent magnet 4-ohm speaker using the SPKR and GND terminals on the rear of the chassis. The antenna input impedance is 50 to 75 ohms, and the ANT terminal should be connected to the inside conductor of a coax line with the shield connected to the GND terminal. For installations using a transmitter, an antenna relay is recommended for changeover. The receiver also supports external muting via a relay controlled by the transmitter, which is essential for voice-controlled transmitters and convenient for manual operations. For voice-controlled transmitters, the SPKR and GND terminals should be connected to the exciter terminals for antitrip control, possibly using a line matching transformer if a higher impedance is required by the transmitter.
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 – 1.4 MB)
Drake-2-a-instruction-and-service MANUAL: Troubleshoot and calibrate Drake-2-a systems efficiently. PDF size: 1.4 MB.
- Brand: Drake-2-a-instruction-and-service
- Model: MANUAL
- Type: Service manual
- File size: 1.4 MB
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
Download MANUAL service manual (PDF)
Drake-2-a-instruction-and-service Manual Overview
The Drake-2-a is a versatile technical equipment designed for precise measurement and control applications in various industrial settings. This device offers reliable performance and ease of use, making it an essential tool for technicians and engineers who require accurate data acquisition and system monitoring.
Main Features and Specifications
- High-precision measurement capabilities with digital readout
- Robust metal housing for durability in harsh environments
- Wide operating temperature range: -20°C to 60°C
- Multiple input/output options for flexible connectivity
- Low power consumption for extended field use
- Integrated calibration function for maintaining accuracy
- Compact and lightweight design for portability
Basic Usage and Operation Tips
To operate the Drake-2-a, first ensure the device is properly connected to the power source and any required sensors or peripherals. Power on the unit and allow it to complete its self-check sequence. Use the front panel controls to select the desired measurement mode and calibrate the device as needed before taking readings. Always handle the device with care to avoid damage to sensitive components.
Troubleshooting and Maintenance
If the device fails to power on, check the power connections and verify the power source is active. In case of inaccurate readings, perform a recalibration following the instructions in the manual. Regularly inspect the device for signs of wear or damage, and clean the exterior with a soft, dry cloth. Avoid using harsh chemicals or abrasive materials. For persistent issues, consult the service manual or contact authorized support.
Safety Reminder
Always follow standard safety protocols when operating the Drake-2-a. Ensure the device is used within the specified environmental conditions and avoid exposure to moisture or extreme temperatures. Disconnect power before performing any maintenance or servicing to prevent electrical shock or damage to the equipment.