Hammarlund HQ-110A - User Manual

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HQ-110A
COM'MUNICATIONS
RECEIVER
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TECHNICAL
DESCRIPTION
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OPERATING
INSTRUCTIONS _
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Hammarlund Manufacturing Company
A
Giannini Scientific Co.
53 West 23rd Street, New York 10, N. Y.
Export Department: 13 East 40th Street, New York 16, N. Y.
MANUAL PART NO, 41383-1
FREE DOWNLOAD COURTESY OF N9SOR WWW.HAMMARLUND.ORG

Summary

Introduction

Installation

Unpacking

Steps to take immediately after receiving the equipment.

Speaker Connection

Instructions for connecting an external speaker to the receiver.

Power Connections

Guidance on safely connecting the receiver to a power source.

Installing Antenna

Advice on connecting various antenna types for optimal reception.

Operation

AM Reception

Setting controls for receiving Amplitude Modulation (AM) signals.

Code Signal Reception

Adjusting controls for optimal reception of CW and Morse code signals.

SSB Reception

Control settings for receiving Single Sideband (SSB) transmissions.

Circuit Theory

Preselection

How the receiver stages prepare signals for mixing and amplification.

Converter Stage

Explanation of the frequency conversion process within the receiver.

Q-Multiplier

Description of the circuit used to enhance selectivity.

IF Amplifier

Details on the stages that amplify the intermediate frequency signal.

AVC System

How Automatic Volume Control maintains consistent audio output levels.

S Meter (Carrier Level)

Function and use of the signal strength indicator meter.

Detector and Noise Limiter

Explanation of the circuits that demodulate signals and reduce noise.

Beat Frequency Oscillator (BFO)

Role of the BFO in tuning and receiving Morse code signals.

Crystal Calibrator

How the crystal calibrator provides precise frequency markers.

Suggested Procedure for Eliminating Common Troubles

Calibration Complaints

Addressing issues related to dial calibration and frequency accuracy.

Service and Alignment Procedure

IF Alignment

Step-by-step guide for aligning the Intermediate Frequency stages.

RF Alignment

Procedures for aligning the Radio Frequency stages for optimal performance.

Calibrator Alignment

Instructions for adjusting the crystal calibrator for accuracy.

HQ-110 A Parts List

Memoranda

Standard Warranty

Hammarlund HQ-110A Specifications

General

Type	Communications Receiver
IF Frequencies	455 kHz
Audio Output	2.5 Watts
Modes	AM, CW
Selectivity	6 kHz at 6 dB
Image Rejection	60 dB
IF Rejection	60 dB
Power Supply	117 V AC
Tubes	6BA6, 6BE6, 6AU6, 6AQ5