The service manual for the Hammarlund Model RBG Radio Receiving Equipment provides detailed instructions for setting up, operating, and troubleshooting the radio receiver, including tube installation, antenna connection, and audio output adjustments. It also outlines procedures for reporting equipment failures and the conditions under which defective parts will be replaced under the contractual guarantee.
Manual Overview
The Hammarlund Model RBG Radio Receiving Equipment service manual provides detailed guidance for troubleshooting, diagnostics, and maintenance. The manual emphasizes the importance of correctly identifying and addressing equipment failures, with a structured process for reporting these issues to the Bureau of Ships. It includes a guarantee that covers all parts except vacuum tubes for a year, with conditions for replacement if defects are widespread. The equipment features an eleven-tube superheterodyne receiver with a frequency range of 5 to 31.0 megacycles, offering various band spreads and optional crystal filter selectivity. Calibration involves using the antenna compensator control for optimal sensitivity and signal-to-noise ratio. The manual describes the setup of the receiver’s input circuit for different antenna configurations and provides instructions for proper installation and operation, including tube placement, speaker connection, and power supply requirements. The receiver includes a tuning meter for signal strength indication and options for automatic volume control and interference reduction.
Quick Issues Covered
- Diagnose power-up failures by checking 115V AC input connection.
- Calibrate antenna compensator for optimal sensitivity and noise rejection.
- Refer to schematics for circuit tracing and component identification.
Overview
The Model RBG Radio Receiving Equipment is designed to operate within a frequency range of 204 to 31.0 megacycles and requires a power supply of 115 volts at 60 cycles. It includes a Radio Receiver (CHC 46140) and a Loud Speaker (CHC 49154). The equipment is manufactured by General Electric Supply Corp and subcontracted to The Hammarlund Manufacturing Co., Inc. It is covered under a contractual guarantee for one year, excluding vacuum tubes, with provisions for replacement of defective parts. The Radio Receiver is an eleven-tube superheterodyne with a continuous frequency range of 5 to 31.0 megacycles across six bands, featuring a beat frequency oscillator for code reception and a crystal filter for signal selectivity. The equipment includes various controls for tuning, sensitivity, and volume, and provides audio output through a phone jack and speaker terminals. The receiver is compatible with both balanced feed lines and simple antenna-ground combinations. Installation involves connecting the speaker, antenna, and power supply, and operation is managed through various switches and controls on the front panel.
Specifications
- RANGE: 204 —- 31.0 mc
- SUPPLY: 115 Volts 60 cycles
- RADIO RECEIVER CHC 46140
- LOUD SPEAKER CHC 49154
- The Type CHC 6140 Radio Receiver is an eleven tube superheterodyne
- Frequency range: 5. to 31.0 megacycles in six bands
- Intermediate frequency amplification operating at 55 Kilocycles
- Two audio output circuits
- Loud speaker: 8 inch permanent magnet dynamic type
- Antenna terminals marked A, A, and G
- Power source: 115 volt, 50 – 60 cycle single-phase alternating current
Controls & Indicators
The front panel of the Model RBG Radio Receiving Equipment includes the following controls and indicators:
1. A switch to control the optional use of the limiter circuit, which helps reduce ignition and similar pulse types of interference.
2. A tuning meter that indicates relative signal strength when the receiver is operated on AVC and the sensitivity control is set at maximum. It functions as a tuning indicator, showing maximum reading at correct signal tuning.
3. An antenna compensator control for aligning the radio frequency amplifier stage to achieve maximum sensitivity, image rejection ratio, and signal-to-noise ratio.
4. A phone jack connected to a balanced winding, delivering approximately 10 milliwatts of audio power to a 600-ohm load.
5. A power switch, which is operated by turning the audio gain control clockwise. This control adjusts the audio signal level.
6. A send-receive switch, which should be in the “receive” position during normal operation. It de-sensitizes the receiver during transmitting periods for protection but does not disconnect power.
7. A band change switch to select the desired reception band.
8. A MAN-AVC-BFO switch to select the type of signal reception desired.
Installation / Setup
The installation and operation instructions for the Model RBG Radio Receiving Equipment include the following highlights:
– Insert the eleven tubes into their proper sockets as indicated by the tube diagram on the tuning condenser cover.
– Attach the speaker cable to the phone tip jacks at the rear of the chassis or use headphones by inserting them into the phone jack on the front panel.
– Connect the antenna according to the provided instructions, ensuring proper grounding.
– Insert the power cord plug into a 115 volt, 50-60 cycle single-phase AC source. Do not connect to DC.
– The equipment is turned on by the power switch, which is activated by turning the audio gain control clockwise. This control also adjusts the audio signal level.
– Ensure the send-receive switch is in the “receive” position for normal operation, especially in the absence of a local transmitter.
– Set the band change switch to the desired reception band and adjust the MAN-AVC-BFO switch according to the type of signal desired. If using AVC, fully advance the sensitivity control and use the audio gain control for output adjustment.
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 – 1.2 MB)
Hammarlund CHC-46140 Manual: A 1.2 MB PDF for technicians to troubleshoot and service the CHC-46140 model efficiently.
- Brand: Hammarlund-chc-46140-instruction-and-service
- Model: MANUAL
- Type: Service manual
- File size: 1.2 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)
Hammarlund CHC-46140 Instruction and Service Manual Overview
The Hammarlund CHC-46140 is a precision radio communications receiver designed for both professional and amateur radio enthusiasts. Known for its robust construction and reliable performance, this device enables users to tune into a wide range of frequencies with high sensitivity and clarity. Ideal for monitoring shortwave broadcasts, emergency communications, and various signal types, the CHC-46140 offers exceptional versatility in a compact form.
Main Features and Specifications
- Frequency coverage: 0.5 MHz to 30 MHz
- High sensitivity with low noise reception
- Multiple tuning modes including manual and automatic
- Built-in signal strength meter for precise adjustments
- Robust metal chassis for durability and shielding
- External antenna connections for enhanced reception
- Adjustable bandwidth filters to improve selectivity
Basic Usage and Operation Tips
To operate the Hammarlund CHC-46140, begin by connecting a suitable antenna to the external input. Power on the device and select the desired frequency range using the tuning dial. Utilize the signal strength meter to fine-tune reception for optimal clarity. Adjust bandwidth filters based on the type of signal being received to reduce interference. For best results, operate the receiver in a location free from electrical noise and ensure the antenna is properly oriented.
Troubleshooting and Maintenance Notes
If you experience weak or distorted signals, first verify antenna connections and ensure the device is properly grounded. Check the tuning dial calibration and adjust if necessary. Regularly clean the exterior and control knobs to prevent dust buildup. For internal maintenance, consult the service manual to safely inspect and replace components such as tubes or capacitors. Avoid unauthorized repairs to prevent damage.
Safety Reminder
Always disconnect the receiver from power sources before performing any maintenance. Use caution when handling internal components, as some parts may retain electrical charge. Operate the device in a dry environment to prevent electrical hazards and avoid exposure to moisture. Follow all safety guidelines outlined in the manual to ensure safe and reliable operation.
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