The manual for the Hammarlund HQ-110A/VHF and HQ-170A/VHF covers the setup and operation of these receivers, including tuning amateur frequencies from 160 meters to 2 meters and improving 6-meter band sensitivity with a low noise pre-amplifier. It also provides troubleshooting guidance, such as using separate antennas for 6 and 2-meter operations and ensuring proper alignment and tuning of the converter and pre-amplifier circuits.
Manual Overview
The Hammarlund HQ-110A/VHF and HQ-170A/VHF receivers are designed to cover amateur frequencies from 160 meters to 2 meters, with enhanced sensitivity on the 6-meter band due to a low noise 6CWH pre-amplifier stage. For 6-meter reception, the bandswitch is set to the 50 to 54 Mc position, and the volume control is pushed in. To receive 2-meter signals, the volume control is pulled out, activating frequency converter stages that convert 144 to 148 Mc signals to 50 to 54 Mc. The manual emphasizes the importance of using separate antennas for 6 and 2-meter operations, with a switching unit recommended for combination antennas. The converter utilizes four 6CW4 Nuvistor tubes and includes a crystal-controlled oscillator. Alignment procedures require a signal generator and alignment tools, with specific instructions for tuning coils and capacitors to achieve optimal performance. The manual advises against paralleling antenna terminations and provides detailed alignment steps to ensure precise tuning and minimal spurious responses.
Quick Issues Covered
- Diagnose power-up failures with volume control knob position.
- Calibrate 6-meter band using L205 and L206 adjustments.
- Trace circuits using detailed schematics for HQ-110A/VHF and HQ-170A/VHF.
Overview
The Hammarlund HQ-110A/VHF and HQ-170A/VHF are receivers designed to tune all amateur frequencies from 160 meters through 2 meters, providing reception for CW, AM, and SSB signals. The manual covers the operation of these receivers, including instructions for receiving 6 meter signals and improving sensitivity using a low noise pre-amplifier. It also includes a theory of operation for the converter, field alignment procedures, and parts list for maintenance and troubleshooting.
Specifications
Refer to the PDF for details.
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
Refer to the PDF for details.
Operation
To receive 6 meter signals (50 to 54 Mcs), the bandswitch should be set to the 50 to 54 Mc position, and the volume control knob should be pushed in. A suitable antenna must be connected to the appropriate antenna terminal. The sensitivity on the 6 meter band is improved by using a low noise 6CWH pre-amplifier stage. For receiving 2 meter signals, the bandswitch should be in the 50 to 54 Mc position, and the volume control knob should be pulled out to activate frequency converter stages that change 144 to 148 Mc signals to 50 to 54 Mc signals. When not receiving 2 meter signals, it is recommended to push in the volume control knob to reduce power consumption. Separate antennas are recommended for 6 and 2 meter operation, and a switching unit should be used if a combination 6/2 meter antenna is desired. On six and two meters, the sideband switch is reversed due to the high frequency oscillator being used on the low side of the incoming signal, resulting in the upper sideband being received in the lower sideband position and vice versa.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Refer to the PDF for details.
Download ADDENDUM Manual (PDF – 447.5 KB)
Hammarlund HQ-110A Addendum: Provides additional instructions for troubleshooting and calibrating the HQ-110A receiver.
- Brand: Hammarlund-hq-110a-instruction-mannual
- Model: ADDENDUM
- Type: Manual
- File size: 447.5 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 ADDENDUM manual (PDF)
Hammarlund HQ-110A Instruction Manual ADDENDUM Overview
The Hammarlund HQ-110A is a classic shortwave communications receiver known for its reliability and high-performance tuning capabilities. This ADDENDUM manual provides additional instructions and updates to enhance the user experience with the HQ-110A model, ensuring optimal operation and maintenance of this vintage radio equipment.
Main Features and Specifications
- Frequency Coverage: 540 kHz to 30 MHz across multiple bands
- Superheterodyne receiver design for improved selectivity and sensitivity
- Multiple tuning ranges with calibrated dials for precise frequency selection
- Built-in noise limiter and automatic volume control (AVC)
- High-quality audio output with adjustable tone control
- Robust metal chassis for durability and reduced interference
Basic Usage and Operation Tips
To operate the HQ-110A, first power on the receiver and allow a brief warm-up period for stable performance. Select the desired frequency band using the band switch, then fine-tune the frequency dial to the target station. Adjust the volume and tone controls for clear audio reception. Utilize the noise limiter to reduce background static during weak signal reception. Regularly calibrate the tuning dial using known reference stations to maintain accuracy.
Troubleshooting and Maintenance Notes
If the receiver exhibits weak or distorted audio, check all antenna connections and ensure the antenna is properly positioned. Inspect tubes for signs of wear or failure and replace if necessary. Clean all control knobs and switches to prevent scratchy sounds or intermittent operation. Periodic alignment of the intermediate frequency (IF) stages may be required to maintain optimal sensitivity and selectivity. Always disconnect power before performing maintenance.
Safety Reminder
Always operate the HQ-110A in a dry, well-ventilated area away from moisture and extreme temperatures. Avoid opening the chassis while the unit is powered to prevent electrical shock. Use only recommended replacement parts and consult the manual for proper servicing procedures. Proper grounding of the equipment is essential to reduce the risk of electrical hazards.
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