The Hammarlund HQ-170A service manual covers the installation, operation, and troubleshooting of the communications receiver, including detailed procedures for alignment, replacing components like the chassis and front panel, and understanding circuit descriptions. It provides specifications, tube socket voltages and resistances, a parts list, and a schematic diagram to assist users in maintaining and optimizing the receiver's performance.
Manual Overview
The Hammarlund HQ-170A service manual provides detailed guidance for technicians on troubleshooting, diagnostics, calibration, and adjustments. The troubleshooting flow involves systematic checks of the receiver’s components, including the RF amplifier, mixers, and oscillators, to identify and resolve issues. Error codes and diagnostics are not explicitly detailed, but technicians are advised to use the schematic diagram and tube socket voltages and resistances for fault isolation. Calibration and adjustments are crucial for optimal performance, with specific procedures outlined for alignment, including the use of the vernier tuning and slot filter controls to achieve precise frequency settings. Board-level guidance includes instructions for removing and replacing the chassis and front panel, as well as replacing the dial cord. The manual emphasizes the importance of maintaining alignment accuracy through the use of iron-core permeability-tuned transformers and regulated power to the oscillator circuit. This ensures high performance and stability across the receiver’s frequency range.
Quick Issues Covered
- Alignment procedure for optimal performance on various amateur bands.
- Tube socket voltage and resistance diagnostics for fault isolation.
- Schematic diagram aids in circuit tracing and component identification.
Overview
The Hammarlund HQ-170A is an amateur ham band communications receiver designed for high performance and reliability. It covers multiple amateur bands, including 6, 10, 15, 20, 40, 80, and 160 meters, with dual and triple frequency conversions depending on the band. The receiver features advanced selectivity and tuning options, including a slot filter and vernier tuning for precise signal reception. The manual includes detailed sections on specifications, circuit description, installation, operation, service and maintenance, alignment procedures, and a parts list.
Specifications
- Amateur Bands Covered: 6, 10, 15, 20, 40, 80, and 180 meter bands
- Number of Frequency Conversions: Dual on 160 and 80 meter bands, Triple on 40, 20, 15, 10, and 6 meter bands
- Frequency Range Covered: 1.8-2.0 Mcs, 3.5-4.0 Mcs, 7.0-7.3 Mcs, 14.0-14.4 Mcs, 21.0-21.6 Mcs, 28.0-30.0 Mcs, 50.0-54.0 Mcs
- Maximum Audio Output: 1.0 Watt (Undistorted)
- Passband Tuning Range: plus/minus3 KCS with calibration every 1 KC
- Output Impedance: 3.2 Ohms plus 500 Ohms
- AVC Action: Operates on RF and 3 IF stages
- Adjustable Selectivity and Selectable Sidebands: Upper sideband–1-2-3 kes, Lower sideband–3 kes, Both sidebands–.5-2-4-6 kes
- Sensitivity: An average of 1.5 microvolts produces 10:1 signal-to-noise ratio on CW and SSB
- Antenna Input: 100 ohms nominal balanced or unbalanced
- Antenna Compensator: Permits compensation for loading effects of various type antennas
- Beat Frequency Oscillator: Variable from zero beat plus/minus 2 kes
- Slot Filter: Range plus/minus 5 kcs of center frequency
- Dimensions: 10-1/2" H x 19" W x 13" D
- Weight: 38 lbs
- Shipping Weight: 45 lbs
- Tube Complement: 6BZ6 RF Amplifier, 6BE6 1st Converter, 6C4 HF Oscillator, 6BE6 2nd Mixer-Crystal Osc., 6BA6 455 kc IF Amp, 6BE6 3rd Mixer-Variable Osc.
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
The source does not contain specific information about the installation or setup process for the HQ-170A communications receiver.
Operation
The manual contains an “Operation” section on page 15, but the source provided does not include the content of that section.
Troubleshooting & Error Codes
“”
Safety & Warnings
Refer to the PDF for details.
Download 2 Service manual (PDF – 5.3 MB)
Hammarlund HQ-170A Service Manual: Troubleshoot and calibrate Model 2 efficiently. File size: 5.3 MB.
- Brand: Hammarlund-hq-170a-instruction-service-manual
- Model: 2
- Type: Service manual
- File size: 5.3 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)
Hammarlund HQ-170A Instruction & Service Manual Overview
The Hammarlund HQ-170A is a classic communications receiver widely used for shortwave listening and amateur radio operations. Renowned for its robust design and high sensitivity, this receiver allows users to tune into a broad range of frequencies with excellent selectivity and stability. The HQ-170A is ideal for hobbyists, radio enthusiasts, and professionals seeking reliable performance in radio signal reception.
Main Features and Specifications
- Frequency Coverage: 540 kHz to 30 MHz across multiple bands
- Superheterodyne receiver design with dual conversion
- High sensitivity and selectivity for clear reception
- Multiple tuning controls including fine and coarse tuning
- Built-in BFO (Beat Frequency Oscillator) for CW and SSB reception
- Analog dial with calibrated frequency markings
- Robust metal chassis for durability and stability
- External speaker and antenna connections
Basic Usage and Operation Tips
To operate the HQ-170A, first connect a suitable antenna and power source. Use the band selector to choose the desired frequency range, then adjust the main tuning dial to locate the signal. Fine tuning can be done with the vernier control for precise frequency adjustment. Engage the BFO switch when receiving Morse code (CW) or single sideband (SSB) transmissions. Adjust the volume and tone controls to optimize audio clarity. Regularly calibrate the dial using known frequency markers to ensure accurate tuning.
Troubleshooting and Maintenance Notes
If reception is weak or distorted, check antenna connections and ensure the power supply voltage is stable. Inspect tubes and replace any that show signs of wear or failure. Clean all control knobs and switches to prevent scratchy audio or intermittent operation. Periodically inspect internal components for dust buildup and corrosion; carefully clean with compressed air and appropriate contact cleaner. Refer to the service manual for detailed alignment procedures and schematic diagrams to assist with advanced troubleshooting.
Safety Reminder
Always disconnect the receiver from power before performing any maintenance or repairs. Avoid exposure to high voltages inside the unit, especially when the chassis is open. Use insulated tools and follow proper electrostatic discharge (ESD) precautions to protect sensitive components. Operate the equipment in a dry environment and avoid contact with water or moisture to prevent electrical shock and damage.
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