Heathkit HW 22A Manual

Page 1

Assembly

and
Operation TABLE OF CONTENTS
of
the IntrOdUCtion...oooooooococoa.oocooo 2
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PartSLiStoooooooocooonot...coo... 3

4 O'- M ETER Step-By-Step Assembly
Circuit Board Assembly. . . . . . . . . . . . 6
888 TRANSCEIVER Parts Mounting-Chassis. . . ..... . . . . 18
Cable Assembly Wiring. . . . . . . . . . . . 20

FunCtion SWitCh Wiring. 0 o o o o o o o o o o o 27
Model HW-22A Top Chassis And Front Panel

Assembly.....................28
Final Wiring-Chassis Bottom. . . . . . . 4. . 30
Final Wiring-Chassis Top. . . .. . . . . . 32
InitialTeStOCOOOOOOOIOO.00....00...33
Power Supply Connections. ...... . .. . . . . 36
Alignment And Adjustment....... . .. ... . 39
FinalASSemblyOO0.0.0.000...0...... 42
mstallation...OOOOOOCOOOOOOOOOOOOOO 45

Noise Suppression Troubleshooting Chart. . . 49

OperatiOnCOOOOCCOOOOOOOOOOOOOOOOO50

InCaseOfDifficulty................ 53
Shipping Information. 53
SpecificationS....................56
Circuit Description. . . . ............ 58
Chassis PhotographS................ 64

Circuit Board X-Ray Views. . . (fold-out
frompage)ooc00000000000000.0000.66

Replacement Parts Price List. . . . . . . . . 66

Schematic. . . .(fold-out from page). . . . . . 69

HEATH COM PANY
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BENTON HARBOR. MICHIGAN 49022 Heathcol'nPahY
All Wm mum/ 6-7-68

Page 2

Page 2

HEA'rI-IKIT-

INTRODUCTION

The Heathkit Model HW-ZZA Amateur Trans-
ceiver is a 40-meter SSB (single-sideband)
transmitter and receiver designed for both mo-
bile and fixed station use. The receiver and
transmitter are locked together with a contin-
uously running VFO (variable frequency oscil-
lator) to insure that both sections operate at the
same frequency. The low frequency VFO is
temperature compensated to provide stable oper-
ation.

Provisions have been made for both PTT (push-
to-talk) and VOX (voice operated transmitter)
Operation. Other features include ALC (auto-
matic level control) to prevent the Transmitter
from overloading, and AVC (automatic volume
control to maintain constant receiver output
over a wide range of input signal strength.

An accessory socket is wired into the circuit
so the Heathkit plug-in Crystal Calibrator
can be used} with the Transceiver to provide

. sembly procedures.

accurate frequency checks at 100 kHz inter-
vals. Connection on the rear of the Trans-
ceiver make the Transceiver easily useable with
linear amplifiers. Power for the Transceiver
can be obtained from the Heathkit Model HP-13
(12 V DC) or Model HP-23 (120 V AC) Power
SUpplies. Equivalent power supplies may also
be used.

NOTE: This Manual uses the new IEEE (Insti-
tute of Electrical and Electronic Engineers)
international standard term "hertz as the basic
unit of frequency. The terms are used as follows:

Hz (hertz) == cps (cycles per second).
kHz (kilohertz) = kc (kilocycles per second).
MHz (megahertz) = mc (megacycles per second).

Refer to the_"Kit Builders Guide" for complete
information on unpacking, parts identification,
tools, wiring, soldering, and step-by-step as-