Hallicrafters S-120 User Manual

MODEL S$-120
= 9892-09701
GENERAL DESCRIPTION
Your new Hallicrafters Receiver Model S-120 tunes from 540 kilocycles to 31 mega~
cycles to bring you the finest in world-wide radio reception. You'll hear foreign and
domestic shortwave broadcasts, amateurs, police, aircraft, ships, and countless other
exciting, distant stations...as well as all your favorite programs on standard broadcast.
The receiver employs the latest type superheterodyne circuit and provides for recep-
tion of AM (voice) and CW (code) signals over its entire tuning range. Special features
in your receiver include; a high sensitivity built-in ferrite antenna for broadcast band
reception,..a 45 inch collaps:cle whip antenna for shortwave reception...an electrical
bandspread dial for fine tuning of the amateur and shortwave bands...a BFO control
(beat frequency oscillator) for CW reception...2 powerful built-i
magnet speaker...provisions for headphone operation...a RECEIVE-STANDBY switch on
the front panel that permits you to silence the receiver without turning it off.
POWER SOURCE
The receiver is designed to operate on 105 to 125 volt 50/60 cycle, AC or DC current.
It may also be operated on 210 to 250 voit AC or DC current using Line Cord Adapter
087-201566, available as an accessory from your Hallicrafters dealer. Power consumption
is 20 watts.
HEADPHONES
A phone jack is provided on the front panel for connecting headphones, Any com-
mercial headphones ranging from 50 to 10,000 ohms may be used. Insertion of the head-
phone plug into the PHONES jack automatically disconnects the internal speaker.
the hallicrafters co.
4401 W. FIFTH AVEHUE - CHICAGO 24, ILLINOIS

Hallicrafters S-120 Specifications

General

Type	Communications Receiver
Image Rejection	40 dB
IF Frequency	455 kHz
Tube count	5
Modes	AM
Selectivity	6 kHz at -6 dB
Power Supply	117 VAC, 50-60 Hz

Summary

Product Overview

Power Source Details

Details power supply voltage, AC/DC operation, and power consumption.

Headphone Jack Usage

Explains headphone jack usage, impedance compatibility, and speaker disconnection.

Antenna Systems

Whip & Single-Wire Antenna

Details installation and use of the whip and single-wire antenna.

Doublet Antenna Installation

Explains the benefits and formula for a half-wave doublet antenna.

Antenna Grounding & Safety

Advises on lightning arrestors and safety ground wire for external antennas.

Tuning Dial Guide

Broadcast Band Tuning

Explains tuning the standard broadcast band and civil defense frequencies.

Shortwave Band Tuning

Details tuning shortwave bands marked 2, 3, and 4 in megacycles.

Receiver Controls

Receive-Standby Switch

Controls receiver standby mode for instant use.

Band Selector Control

Selects tuning bands corresponding to dial markings.

Off-Volume Control

Powers the unit on/off and adjusts audio volume.

Tuning & Bandspread Controls

For wide tuning and precise fine-tuning of stations.

BFO Control Function

Used for CW reception clarity and weak signal sensitivity.

Support and Service Information

Dealer and Service Contact

Guidance on obtaining information and authorized service.

Unauthorized Shipments Policy

Policy regarding unauthorized factory shipments for service.

Production Revision Policy

Hallicrafters' privilege to make production revisions.

Chassis and Dial Maintenance

Chassis Removal Steps

Instructions for detaching the chassis from the cabinet.

Tuning Capacitor Protection

Precaution to rotate tuning controls to prevent capacitor damage.

Bandspread Dial Cord Restringing

Step-by-step guide to restring the bandspread dial cord.

Main Tuning Dial Cord Restringing

Instructions for restringing the main tuning dial cord.

Alignment and Calibration

Alignment Setup Requirements

Initial setup for alignment, including equipment and settings.

IF Stage Alignment

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

RF Stage Alignment

Step-by-step procedure for aligning Radio Frequency stages.