The Drake 2-A service manual provides detailed instructions for setting up and operating the communication receiver, including information on power requirements, antenna connections, and audio output. It also includes troubleshooting guidance, such as correcting component references and aligning the crystal oscillator, to ensure optimal performance across various amateur radio bands.
Manual Overview
The Drake 2-A service manual provides detailed guidance on troubleshooting, calibration, and adjustments for optimal performance. For troubleshooting, it emphasizes the use of a vacuum tube voltmeter (VTVM) to check oscillator operation across various bands, indicating proper function by observing negative voltage on pin 9 of the 6U8 tube. Calibration involves adjusting the 20-meter coil and L9 and L11 coils for maximum negative voltage to ensure oscillator resonance on 20, 15, and 10-meter bands. The manual highlights corrections for component identification, such as capacitor and resistor values, and tube designations, ensuring accurate repairs and maintenance. Board-level guidance includes aligning the crystal oscillator and making necessary adjustments to the IF amplifier and detector circuits. Error codes or diagnostics are not explicitly detailed, but the manual provides a comprehensive voltage and resistance chart for component verification. The manual also includes schematic corrections and parts list updates, ensuring technicians have accurate information for servicing the receiver.
Quick Issues Covered
- Diagnose crystal oscillator issues using VTVM on 6U8 pin 9.
- Correct capacitor and tube references for accurate circuit tracing.
- Adjust L9 and L11 for optimal oscillator performance on specific bands.
Overview
The DRAKE 2-A is a versatile communication receiver designed for high performance in amateur transmission reception. It features a triple conversion superheterodyne design with crystal-controlled high-frequency oscillators and a stable variable oscillator. The receiver offers front panel controls for various functions, including bandwidth, AVC time constants, and detector type, along with optional equipment switching. It includes separate detectors for AM, CW, or SSB, and provides a direct reading dial for accurate frequency readings. The manual covers installation, power requirements, audio output, antenna connections, muting, and anti-trip functions.
Specifications
- OPERATING RANGE: Twelve 600 kc segments may be selected between 3.5 and 30 mc. As originally supplied, crystals are provided for five ham band ranges: 80 meters (3.5 – 4.1 mc), 40 meters (6.9 – 7.5 mc), 20 meters (13.9 ~ 14.5 mc), 15 meters (20.9 – 21.5 mc), 10 meters (28.5 – 29.1 mc), Band switch provides for addition of two ham ranges (28.0 – 28.6 mc) and (29.1 – 29.7 mc) and up to five universal ranges with accessory crystals to cover the frequencies desired. (WWV, MARS, Citizens band, etc.)
- MODE: Selectable Single Sideband with product detector, Amplitude Modulatio with diode or product detector, CW with either detector.
- SELECTIVITY: 2.4 kc at 6 db down, 8.5 ke at 60 db down or 4.8 ke at 6 db down, 23 kc at 60 db down. Selectivity switching is independent of detector switching.
- SPURIOUS RESPONSES: Image rejection more than 60 db; IF rejection more than 60 db on ham ranges; Internal spurious signals within ham bands less than that froma 1 microvolt antenna signal.
- FREQUENCY STABILITY: Less than 500 cycles warm up; less than 100 cycles after warm up; less than 100 cycles for 10% line voltage change.
- DIAL CALIBRATION: 10 kc main dial division; approximately 1 kc vernier dial divisions; Both main dial and vernier adjustable for calibration purposes.
- SENSITIVITY: Less than 1/2 microvolt for 10 db signal to nolse.
- AVC: Amplified, delayed AVC having .75 sec or ,05 sec discharge; less than 100 microsecond charge.
- 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 ist mixer; 6BE6 VFO controlled 2nd converter; 6BE6 fixed frequency 3rd converter; 6BA6 50 kc IF amplifier; 6BE6 Product Detector and BFO; 6BN8 lst 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, consuming 40 watts. For audio output, a 4-ohm permanent magnet speaker should be connected to the SPKR and GND terminals, with an accessory speaker model 2AS available for optimal compatibility. The antenna input impedance is 50 to 75 ohms, and connections should be made using a coax line to the ANT and GND terminals. An optional coax type connector can be installed for the antenna connection. For muting, an external muting relay controlled by the transmitter is recommended, connecting the inner wire of a shielded cable to the MUTE terminal and the shield to a GND terminal. This setup is essential for voice-controlled transmitters and convenient for manual operations. For anti-trip control in voice-controlled transmitters, connect the SPKR and GND terminals to the exciter terminals designated for antitrip control, possibly using a line matching transformer if a higher impedance is required.
Operation
Refer to the PDF for details.
Troubleshooting & Error Codes
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Safety & Warnings
Refer to the PDF for details.
Download 2 Service manual (PDF – 1.4 MB)
Drake 2 Service Manual: Troubleshoot and calibrate Model 2 efficiently. File size: 1.4 MB.
- Brand: Drake-2-a-instruction-and-service-manual
- Model: 2
- 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 2 service manual (PDF)
Drake-2-a Instruction and Service Manual Overview
The Drake-2-a is a precision technical device designed for advanced measurement and control applications. This model -2- offers reliable performance for professionals requiring accurate data acquisition and seamless operation in various industrial and laboratory environments. The instruction and service manual provides comprehensive guidance for setup, operation, maintenance, and troubleshooting to ensure optimal device functionality.
Main Features and Specifications
- High-precision measurement capabilities with digital readout
- Robust construction for durability in demanding environments
- Multi-mode operation supporting both manual and automated control
- Integrated calibration system for maintaining accuracy
- Clear interface with intuitive controls and indicators
- Compatible with standard communication protocols for data export
- Compact design facilitating easy installation and portability
Basic Usage and Operation Tips
Before operating the Drake-2-a, ensure the device is properly calibrated according to the manual’s instructions. Power on the unit and allow it to initialize fully. Use the control panel to select the desired measurement mode and configure settings as needed. Always verify connections and sensor placements to avoid inaccurate readings. For consistent results, perform routine calibration checks and follow the recommended warm-up period before critical measurements.
Troubleshooting and Maintenance Notes
If the device fails to power on, check the power supply and fuse condition. In case of erratic readings, inspect sensor connections and clean any debris or dust from contact points. Regularly update firmware if applicable, and perform scheduled maintenance as outlined in the manual to prevent component wear. For persistent issues, consult the service section for detailed diagnostic procedures or contact authorized support.
Safety Reminder
Always follow standard safety protocols when operating the Drake-2-a. Avoid exposure to moisture and extreme temperatures. Disconnect power before performing any maintenance or repairs. Use only recommended replacement parts and accessories to ensure device integrity and user safety.