Hammarlund-hq-170a-instruction-mannual ADDENDUM – Manual (PDF)

The Hammarlund HQ-110A/VHF and HQ-170A/VHF receivers are designed to tune amateur frequencies from 160 meters to 2 meters, with improved sensitivity on the 6-meter band due to a low noise pre-amplifier stage. The manual provides instructions for setup, operation, and troubleshooting, including the use of separate antennas for 6 and 2-meter operations and alignment procedures for optimal performance.

• Brand: Hammarlund
• Model: ADDENDUM
• Type: manual
• File size: 447.7 KB

Manual Overview

The Hammarlund HQ-110A/VHF and HQ-170A/VHF receivers are designed for tuning amateur frequencies from 160 meters to 2 meters, supporting CW, AM, and SSB signals. For 6-meter signals (50 to 54 MHz), users should set the bandswitch to the appropriate position and push the volume control knob in. The receivers feature improved sensitivity on the 6-meter band due to a low noise 6CWH pre-amplifier. When receiving 2-meter signals, pulling out the volume control knob activates frequency converter stages, converting 144 to 148 MHz signals to 50 to 54 MHz. The manual outlines a detailed alignment procedure requiring a signal generator and alignment tools, emphasizing the importance of proper tuning for optimal performance. The converter uses 6CW4 Nuvistor tubes and includes a crystal-controlled oscillator and a series trap to prevent unwanted signal interference. The manual advises careful alignment following factory procedures and recommends using separate antennas for 6 and 2-meter operations, with a switch box for combination antennas.

Quick Issues Covered

• Diagnose 6-meter pre-amplifier power-up failures via volume control knob.
• Calibrate L205 and L206 for peak signal reception at 50 Mc.
• Trace circuit issues using detailed schematics for HQ-110A/VHF and HQ-170A/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 for CW, AM, and SSB signals. The manual covers operation instructions, including the use of a bandswitch and volume control for receiving 6 meter signals, and the use of separate antennas for 6 and 2 meter operations. It also details the theory of operation, including the components and circuitry involved in the 2-meter converter and 6-meter pre-amplifier, as well as alignment procedures for optimal performance.

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), 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. For improved sensitivity on the 6 meter band, the HQ-110A/VHF and HQ-170A/VHF use a low noise 6CWH pre-amplifier stage. 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. 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 ADDENDUM Manual (PDF – 447.7 KB)

ADDENDUM for Hammarlund HQ-170A: Provides technicians with essential updates for troubleshooting and calibration procedures. PDF size: 447.7 KB.

• Brand: Hammarlund-hq-170a-instruction-mannual
• Model: ADDENDUM
• Type: Manual
• File size: 447.7 KB

Overview

Brief overview of the product.

Specifications

• Key spec 1
• Key spec 2

Controls & Indicators

Control panel/button layout.

Installation / Setup

1. Step 1…
2. Step 2…

Operation

Basic usage, modes, cycles.

Troubleshooting & Error Codes

Safety & Warnings

• Important warning…

Downloads

Download ADDENDUM manual (PDF)

Hammarlund HQ-170A Instruction Manual ADDENDUM Overview

The Hammarlund HQ-170A is a classic communications receiver designed for amateur radio enthusiasts and shortwave listeners. Renowned for its stability and sensitivity, the HQ-170A provides reliable reception across a wide range of frequencies. This ADDENDUM manual supplements the original documentation by providing updated instructions, maintenance tips, and troubleshooting guidance to enhance user experience and ensure optimal performance.

Main Features and Specifications

• Frequency Coverage: 540 kHz to 30 MHz continuous tuning
• Multiple reception modes: AM, CW, and SSB
• High-stability local oscillator for precise tuning
• Built-in noise limiter and automatic gain control (AGC)
• External speaker and headphone jacks for flexible audio output
• Robust metal chassis for durability
• Fine tuning and bandspread controls for accurate signal acquisition

Basic Usage and Operation Tips

To operate the HQ-170A, first ensure the unit is properly connected to a suitable antenna and power source. Begin by selecting the desired frequency band and mode using the front panel controls. Use the fine tuning knob to precisely lock onto the signal. Adjust the volume and tone controls to your preference. For best reception, minimize background noise by engaging the noise limiter and AGC features. Regularly calibrate the dial using known frequency signals to maintain tuning accuracy.

Troubleshooting and Maintenance Notes

If you experience weak or distorted reception, verify antenna connections and inspect cables for damage. Clean the tuning capacitor and switches periodically to prevent oxidation and ensure smooth operation. Should the receiver fail to power on, check the fuse and power supply voltage. For persistent issues, consult a qualified technician familiar with vintage radio equipment. Regularly dust the exterior and avoid exposure to moisture to prolong the life of the receiver.

Safety Reminder

Always disconnect the HQ-170A from the power source before performing any maintenance or cleaning. Avoid operating the receiver in damp or wet environments to prevent electrical shock or damage. Use only the recommended power supply specifications to ensure safe and reliable operation. Keep the unit out of reach of children and handle with care to avoid injury or equipment damage.