The manual for the Hammarlund HQ-110A VHF and HQ-170A VHF covers the setup and operation of the receivers, including tuning for amateur frequencies from 160 meters to 2 meters and improving sensitivity on the 6-meter band with a low noise pre-amplifier. It also provides troubleshooting instructions, such as field alignment procedures using a signal generator and alignment tools, and details on adjusting various components for optimal performance.
Manual Overview
The Hammarlund HQ-110A VHF and HQ-170A VHF receivers are designed to operate across amateur frequencies from 160 meters to 2 meters, supporting CW, AM, and SSB signals. For 6-meter signals, the bandswitch should be set to the 50-54 MHz position, and the volume control knob pushed in. The receivers feature improved sensitivity on the 6-meter band due to a low-noise 6CW4 pre-amplifier stage. When the bandswitch is set for 2-meter signals, the volume control knob should be pulled out to activate frequency converter stages that convert 144-148 MHz signals to 50-54 MHz. Calibration involves using a signal generator and alignment tools, with specific procedures for tuning coils and capacitors to peak performance. Troubleshooting includes ensuring proper antenna connections and using separate antennas for 6 and 2-meter operations, with a switching unit recommended for combined antennas. The manual provides detailed board-level guidance, including parts lists and schematic diagrams for precise maintenance and adjustments.
Quick Issues Covered
- Diagnose power-up failures with volume control knob position.
- Calibrate 6-meter band using L205 and L206 adjustments.
- Trace circuit faults using detailed schematics for HQ-110A VHF.
Overview
The Hammarlund HQ-110A VHF and HQ-170A VHF receivers are designed to tune all amateur frequencies from 160 meters through 2 meters, providing reception of CW, AM, and SSB signals. The manual covers the operation of receiving 6 meter signals, improvements in sensitivity on the 6 meter band due to a low noise pre-amplifier, and the use of frequency converter stages for 2 meter signals. It also includes a field alignment procedure with required equipment and step-by-step instructions for tuning and adjusting the receiver.
Specifications
- HQ-110A-VHF and HQ-170A-VHF receivers
- Tuning: 160 meters through 2 meters
- Reception: CW, AM, SSB signals
- 6CW4 pre-amplifier stage
- Frequency converter stages
- 4 type 6CW4 Nuvister tubes
- Tapped antenna coil
- 6CW4 RF amplifier
- Bandpass filter components: L202, C204, C206, L203, L204
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
The source provides detailed instructions for the field alignment procedure of the Hammarlund HQ-110A VHF and HQ-170A VHF receivers. It outlines the equipment required, such as a signal generator and alignment tools, and gives step-by-step instructions for tuning and peaking various coils and components to ensure optimal performance. The procedure includes adjusting slugs, tuning the receiver to specific frequencies, and using a signal generator to achieve peak readings. Additionally, it mentions the need to unsolder and resolder a B+ lead during the process. Separate antennas are recommended for 6 and 2-meter operations, with a switching unit suggested for combined antenna use.
Operation
To receive 6 meter signals (50 to 54 mcs), place the bandswitch in the 50 to 54 mc position and push in the volume control knob. Connect a suitable antenna to the proper antenna terminal. The sensitivity on the 6 meter band is improved by using a low noise 6CW4 pre-amplifier stage. For receiving 2 meter signals (144 to 148 mc), pull out the volume control knob, which turns on frequency converter stages that change 144 to 148 mc signals to 50 to 54 mc signals. It is recommended to push in the volume control knob when not receiving 2 meter signals 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 ADDENDA Manual (PDF – 1.6 MB)
Hammarlund HQ-110A Addenda Manual PDF helps technicians troubleshoot and calibrate the HQ-110A receiver. File size: 1.6 MB.
- Brand: Hammarlund-hq-110a-instruction-manual
- Model: ADDENDA
- Type: Manual
- File size: 1.6 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
Hammarlund HQ-110A Instruction Manual ADDENDA Overview
The Hammarlund HQ-110A is a high-performance communications receiver designed for amateur radio enthusiasts and professional operators alike. Renowned for its exceptional sensitivity and selectivity, the HQ-110A provides reliable reception across a wide frequency range, making it ideal for shortwave listening, signal monitoring, and general radio communication tasks. This ADDENDA manual supplements the original documentation with updated instructions, maintenance tips, and troubleshooting advice to ensure optimal operation.
Main Features and Specifications
- Frequency Coverage: 540 kHz to 30 MHz continuous tuning
- Multiple bandwidth filters for enhanced selectivity
- High sensitivity with low noise floor for clear signal reception
- Built-in BFO (Beat Frequency Oscillator) for SSB and CW reception
- Calibrated tuning dial with vernier control for precise frequency selection
- Robust metal chassis for durability and shielding
- External antenna and speaker connections
Basic Usage and Operation Tips
To operate the HQ-110A, first connect a suitable antenna and power source. Use the main tuning dial to select the desired frequency, adjusting the vernier control for fine tuning. Select the appropriate bandwidth filter to match the signal type, such as AM, CW, or SSB. Engage the BFO when listening to single sideband or Morse code transmissions. Regularly adjust the volume and tone controls to optimize audio clarity. Always allow the receiver to warm up for a few minutes before critical listening sessions to ensure stable operation.
Troubleshooting and Maintenance Notes
If you experience weak or distorted signals, verify antenna connections and check for any loose wiring. Clean the tuning dial and control knobs periodically to prevent static and ensure smooth operation. Replace vacuum tubes as needed, paying attention to the manual’s recommended types and specifications. For persistent issues, consult the ADDENDA troubleshooting section for detailed diagnostic procedures. Avoid exposing the receiver to moisture or extreme temperatures to prolong its lifespan.
Safety Reminder
Always disconnect the receiver from the power source before performing any maintenance or internal adjustments. Use caution when handling vacuum tubes, as they can become hot during operation. Ensure proper grounding of the equipment to prevent electrical shock and interference. Follow all manufacturer guidelines to maintain safe and reliable operation of your Hammarlund HQ-110A receiver.
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