The manual for the Hammarlund HQ-110A VHF and HQ-170A VHF receivers provides instructions for setting up and operating the receivers to tune amateur frequencies from 160 meters to 2 meters, including the use of a 6CW4 pre-amplifier to improve sensitivity on the 6-meter band. It also includes troubleshooting steps such as alignment procedures using a signal generator and alignment tools to ensure optimal performance.
Manual Overview
The Hammarlund HQ-110A VHF and HQ-170A VHF receivers are designed to handle amateur frequencies from 160 meters to 2 meters, supporting CW, AM, and SSB signals. For 6-meter reception (50 to 54 MHz), users should set the bandswitch accordingly and push the volume control knob in. The receivers feature a low-noise 6CW4 pre-amplifier stage for enhanced sensitivity on the 6-meter band. For 2-meter signals (144 to 148 MHz), the volume control knob should be pulled out to activate frequency converter stages. Separate antennas are recommended for 6 and 2-meter operations, though a switching unit can be used for a combination antenna.
The field alignment procedure requires a signal generator and alignment tools. Users should adjust various coils and capacitors, such as L205, L206, L207, and C202, to achieve peak readings. The manual provides detailed steps for tuning and calibration, ensuring optimal performance. The converter circuit utilizes four 6CW4 Nuvister tubes, with signals introduced through a tapped antenna coil and processed through RF amplifiers and bandpass filters. The parts list includes detailed specifications for components like capacitors, coils, resistors, and tubes, aiding in troubleshooting and repairs.
Quick Issues Covered
- Diagnose power-up failures with volume control knob position.
- Calibrate 6-meter pre-amplifier using L205 and L206 adjustments.
- Trace circuit issues using detailed schematics for HQ-110A and HQ-170A.
Overview
The Hammarlund HQ-110A VHF and HQ-170A VHF are receivers designed to tune all amateur frequencies from 160 meters through 2 meters, capable of receiving CW, AM, and SSB signals. The manual provides instructions for receiving 6-meter signals, improving sensitivity on the 6-meter band with a low noise 6CW4 pre-amplifier stage, and converting 144 to 148 mc signals to 50 to 54 mc signals. It also includes a field alignment procedure with required equipment and steps for tuning and adjusting the receiver.
Specifications
- HQ-110A-VHF and HQ-170A-VHF receivers
- Tuning range: 160 meters through 2 meters
- Reception modes: CW, AM, SSB
- 6CW4 pre-amplifier stage
- Converter: 4 type 6CW4 Nuvister tubes
- Frequency conversion: 144 to 148 mc to 50 to 54 mc signals
- Separate antennas recommended for 6 and 2 meter operation
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
The installation/setup highlights for the Hammarlund HQ-110A VHF and HQ-170A VHF receivers include the following:
– To receive 6 meter signals, 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 proper antenna terminal.
– For 2 meter signals, when the bandswitch is in the 50 to 54 mc position and the volume control knob is pulled out, frequency converter stages are activated to change 144 to 148 mc signals to 50 to 54 mc signals.
– Separate antennas are recommended for 6 and 2 meter operation. If a combination 6/2 meter antenna is used, a switching unit should be employed to disconnect the antenna terminal not in use.
– Field alignment requires a signal generator and alignment tools. The cover must be in place during tuning.
– The alignment procedure involves tuning various coils and components to peak the receiver’s performance at specific frequencies.
These points cover wiring, clearances, calibration, and prerequisites as described in the source.
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 a low noise 6CW4 pre-amplifier stage. For 2 meter signals (144 to 148 mc), pull out the volume control knob to turn on frequency converter stages, which 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, or use a switching unit for a combination 6/2 meter antenna. On six and two meters, the sideband switch is reversed due to the high frequency oscillator, 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-170A Addenda Manual: Provides detailed instructions for troubleshooting and calibrating the HQ-170A receiver.
- Brand: Hammarlund-hq-170a-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-170A Instruction Manual ADDENDA Overview
The Hammarlund HQ-170A is a classic communications receiver renowned for its precision and reliability in shortwave radio reception. This ADDENDA manual provides essential updates and supplementary information to enhance your understanding and operation of the HQ-170A model. Designed for amateur radio enthusiasts and professionals alike, the HQ-170A delivers clear, stable signal reception across a broad frequency range, making it ideal for monitoring and communication purposes.
Main Features and Specifications
- Frequency Coverage: 540 kHz to 30 MHz continuous tuning
- Multiple reception modes: AM, CW, and SSB
- High sensitivity and selectivity for clear signal reception
- Built-in BFO (Beat Frequency Oscillator) for CW and SSB demodulation
- Precision tuning dial with vernier control for fine adjustments
- Robust metal chassis ensuring durability and stable operation
- External speaker and headphone outputs for versatile audio options
Basic Usage and Operation Tips
To operate the HQ-170A, first ensure the receiver is properly connected to a suitable antenna and power source. Use the main tuning dial to select the desired frequency band, and adjust the vernier control for fine tuning. Select the appropriate reception mode (AM, CW, or SSB) depending on the signal type. Utilize the BFO control when receiving Morse code (CW) or single sideband (SSB) transmissions to improve clarity. Regularly adjust the volume and tone controls for optimal audio output.
Troubleshooting and Maintenance
If you experience weak or distorted signals, verify antenna connections and check for any external interference. Periodically clean the tuning dial and control knobs to maintain smooth operation. Inspect tubes and replace any that show signs of wear or failure. For persistent issues, consult the detailed troubleshooting section in the full manual. Always power down the unit before performing any internal maintenance to avoid electrical hazards.
Safety Reminder
Always operate the HQ-170A in a dry, well-ventilated area away from direct heat sources. Avoid exposing the receiver to moisture or extreme temperatures. When servicing the device, disconnect power to prevent electric shock. Use only recommended replacement parts to ensure safe and reliable operation.
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