The service manual for the Hallicrafters Model SR-46 covers setup, operation, and troubleshooting, including details on power source connections, antenna requirements, and installation for both fixed and mobile use. It also provides guidance on reducing television interference and offers specifications for the receiver and transmitter, emphasizing the need for a suitable microphone and antenna for optimal performance.
Manual Overview
The Hallicrafters Model SR-46 service manual provides detailed instructions for troubleshooting, diagnostics, and calibration of this six-meter transceiver. The troubleshooting flow emphasizes checking power connections and ensuring proper antenna setup, as these are common sources of issues. Error codes and diagnostics are not explicitly detailed, but the manual suggests verifying the integrity of connections and components if performance issues arise. Calibration and adjustments focus on ensuring the receiver and transmitter are properly tuned within the 50 to 54 MHz band, with specific attention to the crystal oscillator and RF stage. Board-level guidance includes checking the alignment of the double-conversion superheterodyne receiver and ensuring that the zener-regulated variable oscillator is functioning correctly. The manual also provides guidance on adjusting the squelch and microphone gain controls for optimal performance. For mobile installations, it is crucial to ensure proper grounding and polarity, especially in vehicles with different electrical systems, to avoid operational issues.
Quick Issues Covered
- Diagnose power-up failures with incorrect AC/DC power source connections.
- Adjust relay diode CR3 for vehicles with positive-ground electrical systems.
- Trace circuits using detailed schematics for VFO socket voltages.
Overview
The Model SR-46 is a compact, self-contained six-meter radio station suitable for both mobile and fixed-station use. It operates on a 12-volt DC mobile unit or a 117-volt AC fixed-station unit. The SR-46 features a double-conversion superheterodyne receiver and a transmitter equipped with a crystal for operation on 50.22 MC, with additional positions for four-channel transmitter operation. The receiver is tunable throughout the 50 to 54 MC band. For AC operation, a high-impedance microphone with a push-to-talk switch and a suitable antenna are required. For 12-volt DC operation, a Model MR-40 Mobile Kit is necessary, which includes a heavy-duty vibrator, a DC power cable assembly, and the necessary brackets and hardware for mobile mounting.
Specifications
- RECEIVER
- Reception Mode
- Type A3 emission (AM).
- Sensitivity
- Less than 1 microvolt for 10-DB signal-to-noise ratio (30% modulation).
- Noise Figure
- 4 to 6 DB.
- Power Gain
- 0.5 watt for a one-microvolt, 30%-modulated input.
- AVC Figure of Merit
- Better than 50 DB.
- IF Rejection
- 60 DB.
- Input Impedance
- 50 ohms (unbalanced).
- Output Impedance
- 3.2 ohms.
- Tuning Range
- 49.9 to 54.0 MC (minimum).
- IF Frequencies
- 20.15 MC and 1650 Kc.
- TRANSMITTER
- Power Input
- 10 to 12 watts.
- Tuning Range
- 49.75 to 54.0 MC (minimum).
- Crystal Type
- CR-23/U
- Crystal Frequency
- 25 to 27 MC.
- Output Frequency
- 60 DB.
- Microphone Input
- High impedance with “push-to-talk.”
- Frequency Response
- -3 DB at 300 and 3860 CPS.
- Output Impedance
- 50 ohms (unbalanced).
- Transmission Mode
- Type A3 emission (AM).
- GENERAL
- Antenna Receptacle
- Accepts Amphenol Type 63-15P connector.
- Microphone Receptacle
- Accepts Amphenol Type 80-MC2M connector.
- Number of Tubes
- Ten, plus five diodes and one zener.
- Overall Dimensions (HWD)
- 5-1/2 by 12-1/8 by 8-1/4 inches.
- Shipping Weight
- 17 pounds.
- AC OPERATION
- 105/125 volts, 60 cycles, 65 watts maximum.
- DC OPERATION
- 11/16 volts (negative ground), 5 amperes maximum.
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
The setup highlights for the Model SR-46 include the following:
– For AC operation, a high-impedance microphone with a push-to-talk switch and a suitable antenna are required.
– A Model MR-40 Mobile Kit is necessary for 12-volt DC operation, which includes a heavy-duty vibrator, a DC power cable assembly, and the necessary brackets and hardware for mobile mounting.
– The unit should be placed in a location that allows free air circulation through the ventilation holes and openings in the cabinet.
– In fixed installations, avoid placing the unit near heat sources or in direct air blasts from fans.
– For mobile installations, avoid direct air blasts from heaters or air conditioning units.
– The SR-46 can be used with a 117-volt AC source or a 12-volt DC, negative-ground operation by selecting the correct power cord and plug assembly.
– For mobile installations, the power lead with the in-line fuseholder should be connected directly to the positive (ungrounded) battery terminal.
– The SR-46 is wired for 12-volt negative-ground operation. If used in vehicles with a 12-volt positive-ground electrical system, it is necessary to reverse the polarity of relay diode CR3 and relay electrolytic filter capacitor C61, and connect an additional wire from the SR-46 chassis to the vehicle’s firewall or frame.
– The SR-46 is designed for 50-ohm termination, and antenna polarization is important for optimal operation. The antenna should be connected using RG-8/U or RG-58/U coaxial cable, with RG-8/U recommended for lengths over 25 feet.
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 2 Service manual (PDF – 458.9 KB)
Hallicrafters SR-46 Service Manual: Troubleshoot and service Model 2 with detailed procedures. PDF size: 458.9 KB.
- Brand: Hallicrafters-sr-46-operation-service-manual-very-hard-to-read
- Model: 2
- Type: Service manual
- File size: 458.9 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
Download 2 service manual (PDF)
Hallicrafters SR-46 Operation & Service Manual Overview
The Hallicrafters SR-46 is a vintage shortwave communications receiver designed for amateur radio enthusiasts and professionals alike. Known for its robust construction and wide frequency coverage, the SR-46 allows users to tune into a broad range of frequencies for listening to international broadcasts, amateur radio transmissions, and other radio signals. This manual provides detailed operation instructions and service information to help maintain and optimize the receiver’s performance.
Main Features and Specifications
- Frequency coverage: 540 kHz to 30 MHz
- Multiple tuning bands with calibrated dials
- Built-in BFO (Beat Frequency Oscillator) for CW and SSB reception
- AM and CW mode reception capability
- High sensitivity and selectivity for clear signal reception
- Robust analog circuitry with vacuum tube technology
- External speaker and antenna connections
- Compact and durable metal chassis design
Basic Usage and Operation Tips
To operate the SR-46, first ensure the unit is properly connected to a suitable antenna and power source. Use the band selector to choose the desired frequency range, then fine-tune the main dial to locate the desired signal. Adjust the volume and tone controls for optimal audio clarity. For CW or SSB signals, engage the BFO to improve intelligibility. Regularly warm up the receiver before extended use to stabilize tube operation and avoid frequency drift.
Troubleshooting and Maintenance Notes
Common issues include weak or distorted audio, drifting frequency, or failure to power on. Check all tube sockets and replace any weak or faulty tubes. Inspect and clean all switches and contacts to ensure good electrical connections. Verify the antenna and speaker connections are secure. Periodically align the receiver using the service procedures outlined in the manual to maintain peak performance. Avoid exposure to moisture and excessive dust to prolong the device’s lifespan.
Safety Reminder
Always disconnect the SR-46 from power before servicing or opening the chassis. High voltages are present inside the unit that can cause serious injury or death. Use caution when handling vacuum tubes as they become hot during operation. Operate the receiver in a well-ventilated area and avoid placing it near flammable materials.