Heathkit HW-9 User manual

for the
DELUXE QRP
CW TRANSCEIVER
Model HW-9
•**
HEATH COMPANY •BENTON HARBOR, MICHIGAN

Page 2Heathkit
TABLE OF CONTENTS
Introduction 3
Unpacking 4
Assembly Notes 5
Oscillator Circuit Board 9
9
Parts List
Step-by-Step Assembly 13
T/R Circuit Board 27
27
Parts List
Step-by-Step Assembly 31
Chassis
Parts List
49
49
Step-by-Step Assembly 51
Initial Tests 73
Resistance Tests 73
ft
Alignment 77
Initial Control Settings 77
78
HFO Alignment
VFO Alignment
BFO Alignment
Mixer Filter Alignment
T/R Board Adjustments
79
79
80
81
Final Assembly 85
Installation and Operation 86
Rear Panel Connections 86
Front Panel Controls 88
In Case of Difficulty 89
Visual Checks 89
Precautions for Troubleshooting 90
Checking Transistors and Diodes 90
Troubleshooting Charts 91
Specifications 95
Circuit Description 98
Circuit Board X-Ray Views
Illustration Booklet, Page 37
Semiconductor Identification Charts 102
Schematic Fold-in
Warranty Inside front cover
Customer Service Inside rear cover
\

Heathkit
INTRODUCTION
The Heathkit Model HW-9 Deluxe QRP CW Trans-
ceiver is acompact 80-through 10-meter HF trans-
ceiver designed with the avid low-power CW
operator in mind. It covers the lower 250 kHz of
the 80, 40, 20, and 15-meter amateur bands. When
you install the Model HWA-9 Accessory Band Pack,
the Transceiver also covers the 30, 17, and 12-meter
WARC bands and the lower 250 kHz of the 10-meter
band. Broadband circuits eliminate the need to tune
circuits within aband. Just turn the Band switch
and select the desired frequency.
The design of the wide-band front-end stages elimi-
nates the need for the customary RF amplifier in
the receiver section. This results in areceiver that
can properly handle incoming signals with awide
dynamic range. Also, only one frequency conversion
is used in the main signal path of the receiver sec-
tion. This is done to reduce spurious responses (bir-
dies) and to maintain high image rejection.
Power for this Transceiver can be furnished by a
power supply, such as the Heathkit Model PSA-9
Power Supply, or directly from any regulated 12.6
VDC source that can supply at least 1ampere.
To align this Transceiver, you should have aVTVM
(vacuum-tube voltmeter) or VOM (volt-ohmmeter),
afrequency counter capable of measuring frequen-
cies accurately up to at least 10 MHz, and a50-ohm
resistive dummy load.
The following features are also included in your
Transceiver:
•Solid-state transmit/receive switching
that permits full break-in operation.
•Continuously variable RF power output.
•Receiver incremental tuning (RIT).
•An audio-active filter with selectable
wide or narrow selectivity.
•Afront panel meter that indicates signal
strength in receive and relative power in
transmit.
This Transceiver is ahandy addition to any ham
shack for avid QRP operators, newcomers, or old
timers alike.

Page 4Heathkif
UNPACKING
UNPACK ANY PART OF YOUR KIT
UNTIL ASTEP DIRECTS
Locate the "Pack Index Sheet" that is packed inside
the main shipping carton for your Transceiver. Note
that the shipping carton is divided into three smaller
sections. These sections make up Packs 1and 2and
the Final Pack, and may be made up of several bags,
envelopes, small boxes, and loose parts. Do not un-
pack any of these parts until astep specifically di-
rects you to do so.
When you check parts against a"Parts List," return
any part or group of parts packaged in a bag or other
container, with apart number on it, to its container
after you identify it. Leave these parts there until
you actually use them in astep. This will help pre-
vent you from mixing up the parts, and help you
identify the parts when you need them.
Some parts, however, are in abag or envelope that
is not marked with an actual part number, but with
apackaging number that begins with the number
"173-." These numbers are used for packaging pur-
poses only and do not appear in the Manual "Parts
Lists." Open each bag or envelope that is marked
with only a"173-" packaging number to identify the
parts it contains.
NOTE: Never use a"173-" packaging number if you
must order areplacement part. Use only the part
numbers listed in the Manual Parts List for this pur-
pose.
Save all of the packaging material until you account
for all of the parts.

Heathkit Page 5
ASSEMBLY NOTES
TOOLS
You will need these tools to assemble your kit
PLIERS LONG-NOSE DIAGONAL
PLIERS CUTTERS WIRE
STRIPPERS
1/8" &1/4"-BLADE
SCREWDRIVERS PHILLIPS
SCREWDRIVER 1/4"
WRENCH .050" &1/16"
ALLEN WRENCHES
With Kit)
*To Remove Solder From Circuit Connections.
ASSEMBLY
1. Follow the instructions carefully. Read the en-
tire step before you perform each operation.
2. The illustrations in the Manual are called Pic-
torials and Details. Pictorials show the overall
operation for agroup of assembly steps; Details
generally illustrate asingle step. When you are
directed to refer to acertain Pictorial "for the
following steps," continue using that Pictorial
until you are referred to another Pictorial for
another group of steps.
3. Most kits use aseparate "Illustration Booklet"
that contains illustrations (Pictorials, Details,
etc.) that are too large for the Assembly Manual.
Keep the "Illustration Booklet" with the As-
sembly Manual. The illustrations in it are ar-
ranged in Pictorial number sequence.
4. Position all parts as shown in the Pictorials.
5. Solder a part or agroup of parts only when
you are instructed to do so.

Page 6Heathkit
6. Each circuit part in an electronic kit has its own
component number (R2, C4, etc.). Use these
numbers when you want to identify the same
part in the various sections of the Manual.
These numbers, which are especially useful if
apart has to be replaced, appear:
—In the Parts List,
—At the beginning of each step where acom-
ponent is installed,
—In some illustrations,
—In the Schematic,
—In the section at the rear of the Manual.
7. When you are instructed to cut something to
aparticular length, use the scales (rulers) pro-
vided at the bottom of the Manual pages.
ISAFETY WARNING: Avoid eye injury when
Iyou cut off excessive lead lengths. Hold the
Ileads so they cannot fly toward your eyes.
SOLDERING
Soldering is one of the most important operations
you will perform while assembling your kit. Agood
solder connection will form an electrical connection
between two parts, such as acomponent lead and
acircuit board foil. Abad solder connection could
prevent an otherwise well-assembled kit from
operating properly.
It is easy to make agood solder connection if you
follow afew simple rules:
1. Use the right type of soldering iron. A22 to
25-watt pencil soldering iron with a1/8" or
3/16" chisel or pyramid tip works best.
2. Keep the soldering iron tip clean. Wipe it often
on awet sponge or cloth; then apply solder
to the tip to give the entire tip awet look. This
process is called tinning, and it will protect the
tip and enable you to make good connections.
When solder tends to "ball" or does not stick
to the tip, the tip needs to be cleaned and retin-
ned.
NOTE: Always use rosin core, radio-type solder
(60:40 tin-lead content) for all of the soldering in
this kit. This is the type we have supplied with the
parts. The Warranty will be void and we will not
service any kit in which acid core solder or paste
has been used.

Heathkit® Page 7
PARTS
imi
Resistors are identified in Parts Lists and steps by
their resistance value in fl (ohms), kfl (kilohms), or
MH (megohms). They are usually identified by acolor
code and four or five color bands, where each color
represents anumber. These colors (except for the last
band, which indicates aresistor's "tolerance") will be
given in the steps in their proper order. Therefore, the
following color code is given for information only.
NOTE: Occasionally, a"precision" or "power" resis-
tor may have the value stamped on it.
1/4-WATT OR
mi OR
1/2-WATTm
1-WATT
BANDS: 1
2-WATT
Multiplier
23^ Tolerance
5-BAND RESISTORS
(±1%)
4-BAND RESISTORS
(±10%\
±5% /
*Note Wide
Space
BANDS Tolerance
Band 3(if used)
3rd Digit Multiplier
Color Digit
Black
Brown
Red
Orange
Yellow
Green
Blue
Violet
Gray
White
Color
Black
Brown
Red
Orange
Yellow
Green
Blue
Silver
Gold
Multiplier
1
10
100
1,000
10,000
100,000
LOOO.OOOi
0.01
0.1
Capacitors will be called out by their capacitance
value in /xF (microfarads) or pF (picofarads) and type:
ceramic, Mylar*, electrolytic, etc. Some capacitors
may have their value printed in the following man-
ner:
EXAMPLES:
151K =15 x10 =150 pF
759 =75 X0.1 =7.5 pF
First digit of
capacitor's value: 1
Second digit of
capacitor's value: 5
Multiplier: Multiply the
first &second digits by
the proper value from the
Multiplier Chart.
To find the tolerance of
the capacitor, look up
this letter in the Tolerance
columns.
NOTE: The letter "R" may be used at times to signify a
decimal point: as in: 2R2 =2.2 (pF or /jlF).
IMULTIPLIER |TOLERANCE OF CAPACITOR
IFOR THE
INUMBER: MULTIPLY
BY:
I10 pF OR
|LESS LETTER OVER
10 pF
I01|±0.1 pF B
|110 |±0.25 pF c
I2100 ±0.5 pF D
I31000 |±1.0 pF F±1% I
410,000 |±2 0pF G±2% I
5100.000 H±3%
J±5% I
eI0.01 K±10% I
9I0.1 M|±20%
*DuPont Registered Trademark.

Page 8Heathkif
SPECIAL ASSEMBLY NOTES
NOTE: The following suggestions will not necessar-
ily improve the operation of your kit. They will,
however, help you troubleshoot it (if it ever becomes
necessary), and help you perform the "Circuit Board
Checkout" steps at the end of the assembly sections
of this Manual. And you will have amore profes-
sionally-built kit when you finish.
1. When you install resistors, always position
each resistor so you can read the bands on the
resistor in the same direction as you can read
the printing on the circuit board (see Figure 1).
For resistors that have the value printed on
them instead of color bands, install these resis-
tors so the values are facing aw^y from the cir-
cuit board and read in the same direction as the
printing on the circuit board.
3. When you install electrolytic or other tubular
capacitors, always position each capacitor so
the value is facing away from the circuit board
(see Figure 3). Be sure to observe the correct
polarity when you install electrolytic
capacitors (as you will be directed in the
steps). Other, non-polarized, capacitors
should be installed so you can read the values
in the same direction as the printing on the cir-
cuit board.
VALUE
BANDS VALUE
OR
Figure 1
4
Figure 3
Install diodes so the type numbers or part num-
bers are facing away from the circuit board. Be
sure to match the band on one end of each
rJindfi with the band mark on the circuit board.
2. When you install ceramic, Mylar, or mica
capacitors, always position each capacitor so
you can read the value on the capacitor in the
same direction as you can read the printing on
the circuit board (see Figure 2).
VALUES
CERAMIC MYLAR MICA
"-re 2

Heathkit Page 9
OSCILLATOR CIRCUIT BOARD
PARTS LIST
Remove the parts from Pack #1. Then check each To order areplacement part, always include the
part against the following list. Do not remove com- PART NUMBER. Use the Parts Order Form fur-
ponents that are supplied on atape from the tape nished with this kit. If aParts Order Form is not
Return any part available, refer to "Replacement Parts" inside the
is packed in an individual envelope, with the part rear cover of this Manual. For prices, refer to the
number on it, back to the envelope after you identify separate "Heath Parts Price List."
it until that part is called for in astep. Do not throw
away any packing material until all of the parts are
accounted for.
TAPED COMPONENTS
NOTE: These parts are taped on astrip which was checked
before shipment. Since these parts are taped in the order
of assembly, you may not wish to check them against the
following list.
HEATH QTY. DESCRIPTION CIRCUIT
Part No. Comp. No.
RESISTORS
NOTE: The following resistors are rated at 1/4-watt and have
atolerance of 5%. A5% tolerance is indicated by afourth
color band of gold.
6-470-12 347 n(yel-viol-blk) R128, R129,
R142
6-1 01 -1 2 5 100 ft (brn-blk-brn) R1 04, R1 38,
R147, R153,
R174
6-221 -12 3220 ft (red-red-brn) R1 23, R1 24,
R143
HEATH QTY. DESCRIPTION CIRCUIT
Part No. Comp. No.
Resistors (Cont'd)
6-271 -1
2
5270 a(red-viol-brn) R155, R159,
R161.R164,
R165
6-331 -1
2
2330 ft (org-org-brn) R135, R148
6-471 -1
2
1470 ft (yel-viol-brn) R156
6-681-12 2680 ft (blu-gry-brn) R145, R151
6-1 52-1
2
2 1500 ft (brn-grn-red) R158, R163
6-222-1
2
52200 ft (red-red-red) R107, R109,
R113, R117,
R166
6-332-1
2
23300 ft (org-org-red) R157, R162

Page 1
0
Heathkit
HEATH QTY. DESCRIPTION CIRCUIT
Part No. ComD No
Resistors$(Cont'd)
6-392-12 23900 ft (org-wht-red) R137 R13Q
6-682-12 26800 ft (blu-gry-red) R168. R169
6-822-12 18200 ft (gry-red-red) R105
6-103-12 310kft(brn-blk-org) R118 R132
R133
6-123-12 312kft (brn-red-org) R108 R110
R114
6-223-12 522 kft (red-red-org) R102 R103
R141 R171
R172
6-333-1
2
133 kft (org-org-org) R127111 I
6-473-1
2
147 kft (yel-viol-org) R154
6-104-12 3100 kft (brn-blk-yel) R126, R144,
R152
6-224-12 1220 kft (red-red-yel) R136
6-334-1
2
1330 kft (org-org-yel) R134
6-155-12 11.5 Mft (bm-grn-grn) R146
HEATH
Part No.
QTY. DESCRIPTION
CAPACITORS
21-761 32 .01 jtF (103) glass ceramic
CIRCUIT
Comp. No
21 -762 1.1 >iF (1 04) glass ceramic
C102,
C112,
C129,
C141,
C145,
C153,
C162,
C176,
C181,
C191,
C193,
C197,
C209,
C214,
C217,
C219,
C177
C107,
C121,
C139,
C143,
C151,
C157,
C174,
C178,
C189,
C192,
C195,
C203,
C212,
C216,
C218,
C226
DIODES
56-24 11N458 D119
56-26 21N191 (brn-wht-brn) D138, D139
56-56 21N4149 D141.D142
56-646 17 BA-244 (red-yel-yel) D101.D102,
D103, D104,
D107fD108,
D112, D113,
D121.D122,
D123, D124,
D127, D128,
D132,D133,
0143
57-65 11N4002 D118

Heathkit Page 1
1
NON-TAPED PARTS
The following parts are not taped on strips. The key numbers
correspond to the numbers on the "Oscillator Circuit Board
Parts Pictorial" (Illustration Booklet, Page 1).
KEY HEATH
No. Part No.
QTY. DESCRIPTION CIRCUIT
Comp. No.
KEY HEATH
No. Part No.
QTY. DESCRIPTION CIRCUIT
Comp. No
CAPACITORS INDUCTORS
Mica B1 40-1785
A1 20-97 250 pF C207. C208
A1 20-110 175 pF C205
A1 20-119 290 pF C127.C128
A1 20-102 1100 pF C206
A1 20-124 1115pF C149
A1 20-1 78 2160 pF C118.C119
A1 20-105 1180 pF cm
A1 20-1 08 1200 pF C109
A1 20-1 1
5
2300 pF C105, C106
Ceramic
A2 21-33 13.3 pF C126
A2 21-168 44.7 pF C117.C179,
C188,C194
A2 21-78 35pF C1 67.C1 71,
C173
A2 21-169 26pF C108.C169
A2 21-115 19pF C104
A2 21-3 410pF C168.C172,
C202, C21
1
A2 21-60 118 pF C186
A2 21-84 124 pF C161
A2 21-7 333 pF C101.C184,
C213
A2 21-147 247 pF C156,C175
A2 21-190 150 pF C182
A2 21-54 175 pF C225
A2 21-75 1100pF(100K) C152
A2 21-22 1220 pF C221
A2 21-17 1270 pF C222
A2 21 -722 1330 pF C201
A2 21-56 1470 pF C196
A2 21-13 1500 pF C198
A2 21-191 3510 pF C183.C185,
C187
A2 21-171 2680 pF C199.C223
A2 21-140 2.001 ,xF(1000pF) C103, C215
B2 40-2076
4.14 \lH coil (violet)
6.3 jjlH coil
B2 40-2075 3.44 jjlH coil
B2
B3
B4
B5
B5
40-2070
40-21 1
1
45-73
45-625
45-621
1
1
1
2
4
3m.H coil
5.5 ljlH coil
2.2 choke (red-red-gold)
4.7 ixH choke (yel-vioi-gold)
100 n-H choke (bm-blk-brn)
TRANSISTORS
L107, L108,
L112, L113
L101.L102,
L124, L125,
L127, L129
L103, L104,
L137
L135
L118
L133
L1 22, L1 23
L119, L121,
L1 34, L1 36
NOTE: Transistors may be marked for identification in any
of the following four ways:
1.Part number.
2. Type number.
3. Part numbe
4. Part numb<
Part number and type num
Part number with atype
listed.
other than the one
C1 41 7-234 12N3638A
C1 41 7-293 42N5770
C2 417-863 1MFE131
C1 41 7-1 69 3MPF105
C1 41 7-801 5MPSA20
Q106
Q101.Q108,
Q109, Q111
Q107
Q102, Q105,
Q112
Q103, Q104,
Q113, Q114,
Q115
CRYSTALS
D1
D1
D1
D1
D1
404-639
404-664
404-665
404-667
404-669
1
1
1
1
1
8.8314 MHz
18.330 MHz
21 .830 MHz
28.830 MHz
35.830 MHz
Y109
Y101
Y102
Y104
Y106
L

Page 1
2
Heathkif
KEY HEATH
No. Part No. QTY. DESCRIPTION CIRCUIT
Comp. No KEY HEATH
No. Part No.
QTY. DESCRIPTION CIRCUIT
Comp. No
CONNECTORS MISCELLANEOUS
E1 432-121 3PPR nin
iV-/D pill
E2 432-134 5who ouorvoi
E3 432-969 15-pin plug
WIRE—CABLE
340-1 3" Large bare wire
340-8 18" Small bare wire
343-12 10' 6" Shielded cable
344-2 5" Black stranded wire
344-59 2' White solid wire
344-3 18" Large red stranded wire
344-163 6" Small black solid wire
344-170 7' Violet solid wire
347-55 4' 8-wire cable
F1
F1
F2
F3
F4
10-918
10-941
85-2801-1
206-1463
475-1
0
597-260
1
500 acontrol
100 kn control
Oscillator circuit board
Oscillator shield
0Ferrite bead
Blue and white label*
Parts Order Form*
Taped Component Chart
Assembly Manual (see Page
1for the part number)
Solder
R173
R131
*These items may be packed inside the Manual.
°%V2 3
A1(inches) 2 3 4 5 67

Page 1
3
Heathkit
STEP-BY-STEP ASSEMBLY
Refer to Pictorial 1-1 (Illustration Booklet, Page 2)
as you read the following notes and steps.
and solder the leads to the foil on the other side
unless astep specifically directs you otherwise.
NOTES:
1. such
2.
shown in Pictorial 1-1, are divided into two
or more sections. These sections show you
which area of the circuit board you are work-
ing in for aspecific series of steps.
Refer to the "Taped Components Chart." Note
that it is divided into numbered sections that
match the sections on the circuit board.
3.
4.
5.
Each series of steps has you installing parts
in atop-to-bottom, left-to-right sequence. Oc-
casionally, you may be directed to install a
component in an area out of sequence. These
components are each identified in the step
and on the Pictorial with a special callout.
Check off each step as you perform it. You
may also wish to place acheck mark near each
component on the Pictorial as you install it.
In general, solder instructions are given only
at the end of aseries of similar steps. You
may solder more often, if you desire.
In the following steps, you will be given detailed
instructions on how to install and solder the first
part on the circuit board. Read and perform each
step carefully. Then use the same procedure when-
ever you install parts on acircuit board.
()Note that the circuit board has foil on one side
and component outlines on the other. The side
with the component outlines is referred to as
the "component side."
shown
with the component side up. Always install compo-
nents on the component side of the circuit board,
()C176: Hold a.01 u.F (103) glass ceramic
capacitor as shown and bend the leads straight
down to fit the hole spacing on the circuit
board.
PUSH DOWN
HERE
()Start the leads into the holes at the capacitor's
location at the top of Section 1of the circuit
board. This type of capacitor can be positioned
either way. NOTE: Glass ceramic capacitors
are identified on the circuit board by the fol-
lowing outlines:
OUTLINE COMPONENT
NUMBER OUTLINE
OR
HORIZONTAL
MOUNTING
COMPONENT
^NUMBER
C000
VERTICAL
MOUNTING
()Press the capacitor against the circuit board.
Then bend the leads outward slightly to hold
it in place.

Page 1
4
Heathkif
()Solder the capacitor leads to the circuit board
as follows:
start
1. Push the soldering iron
tip against both the lead
and the circuit board foil.
Heat both for two or three
seconds.
SOLDERING
IRON
COMPONENT
LEAD
lowing components. The sequence of the steps
matches the locations of the components on the cir-
cuit board. NOTE: Make sure you installed capacitor
an
In order to make the assembly easier, you may wish
to precut all of the parts from asection and, as you
do, prebend the leads and lay the parts on your work
surface in the order of assembly. Then you can hold
the circuit board while you install the parts in se-
quence without interruption.
CIRCUIT BOARD NOTES:
2. Then apply solder to the
other side of the connec-
tion. IMPORTANT: Let
the heated lead and the
circuit board foil melt the
solder.
SOLDERING
SOLDER
3. As the solder begins to
melt, allow it to flow
around the connection.
Then remove the solder
and the iron and let the
connection cool.
SOLDERING
SOLDER
()Cut off the excess lead lengths close to the con-
nection. WARNING: Clip the leads so the ends
will not fly toward your eyes.
()Check each connection. Compare it to the il-
lustrations on Page 15. After you have checked
the solder connections, proceed with the as-
sembly on this page. Use the same soldering
procedure for each connection.
1.
2.
In some of the following steps you will install
diodes. Whenever you install a diode, always
match the banded end of the diode with the
band mark on the circuit board. Adiode will
not work properly if it is installed backwards.
The banded end will always 1
ward the colored tape on the
nents Chart."
it Taped Compo-
BAND SOLID BODY
—[1 ¥=
•••_J 1m~_ •
•::;7: •™
••v.vf-.- QL
BANDED END
BAND ASS
BODY COLORED
END
INSIDE
CAUTION:ALWAYS POSITION THE
BANDED END OF ADIODE AS
SHOWN ON THE CIRCUIT BOARD.

Heathkif
Page 1
5
AGOOD SOLDER CONNECTION
Solder Flows Outward
And Gradually Blends
With The Foil And The
Lead.
FOIL
Soldering
Iron
Positioned
Correctly
I
I
I
I
I
I
L
When you heat the lead and the circuit board foil at the same
time, the solder will flow evenly onto the lead and the foil. I
The solder will make agood electrical connection between |
the lead and the foil.
POOR SOLDER CONNECTIONS
Solder Does Not Flow
Onto Lead. AHard Rosin
Bead Surrounds And
Insulates Connection.
FOIL
ROSIN /\ 4'Soldering
*Iron
Positioned
Incorrectly
Solder Appears To
Flow Inward And Sit On
Top Of Foil.
FOIL
Soldering
Iron
Positioned
Incorrectly
ROSIN
When the lead is not heated sufficiently, the solder
will not flow onto the lead as shown above. To cor-
rect, reheat the connection and, if necessary, apply a
small amount of additional solder to obtain agood
connection.
When the foil is not heated sufficiently the solder will
blob on the circuit board as shown above. To correct,
reheat the connection and, if necessary, apply asmall
amount of additional solder to obtain agood connec-
tion.
SOLDER BRIDGES
Asolder bridge between two adjacent foils is shown
in photograph A. Photograph Bshows how the con-
nection should appear. Asolder bridge may occur if
you accidentally touch an adjacent previously sol-
dered connection, if you use too much solder, or if
you "drag" the soldering iron across other foils as you
remove it from the connection. Agood rule to follow
is: always take agood look at the foil area around each
lead before you solder it. Then, when you solder the
connection, make sure the solder remains in this area
and does not bridge to another foil. This is especially
important when the foils are small and close together.
NOTE: It is alright for solder to bridge two connec-
tions on the same foil.
Use only enough solder to make agood connection,
and lift the soldering iron straight up from the circuit
board. If asolder bridge should develop, turn the
circuit board foil-side-down and heat the solder be-
tween connections. The excess solder will run onto
the tip of the soldering iron, and this will remove the
solder bridge. NOTE: The foil side of most circuit
boards has acoating on it called "solder resist/' This
is aprotective insulation to help prevent solder
bridges.
A
SOLDER
BRIDGE

Page 1
6
Heathkif
()D139: 1N191 diode (brn-wht-brn, #56-26).
NOTE: Diodes are identified on the circuit
board by the following outline:
BAND OUTLINE
()D138: 1N191 diode (brn-wht-brn, #56-26).
()C177: .1 |xF (104) glass ceramic capacitor.
()R103: 22 kft (red-red-org) resistor. NOTE: Re-
sistors are identified on the circuit board by
the following outlines:
OUTLINE COMPONENT
NUMBER OUTLINE
\
OR
HORIZONTAL
MOUNTING
COMPONENT
NUMBER
VERTICAL
MOUNTING
)C102: .01 \lF (103) glass ceramic capacitor.
)R102: 22 kft (red-red-org) resistor.
)R104: 100 ft (brn-blk-brn) resistor.
)R141: 22 kft (red-red-org) resistor.
)C178: .01 jxF (103) glass ceramic capacitor.
)R137: 3900 ft (org-wht-red) resistor.
)R136: 220 kft (red-red-yel) resistor.
)R135: 330 ft (org-org-brn) resistor. NOTE:
Mount this resistor vertically above its outline
as shown below:
()Solder the leads to the foil and cut off the ex-
cess lead lengths.
Install components in Section 2of the circuit board
as follows:
()R105: 8200 ft (gry-red-red) resistor.
()R139: 3900 ft (org-wht-red) resistor.
()R142: 47 ft (yel-viol-blk) resistor.
()R138: 100 ft (brn-blk-brn) resistor.
()C189: .01 y,F (103) glass ceramic capacitor.
()R129: 47 ft (yel-viol-blk) resistor.
()Rl34:330 kft (org-org-yel) resistor.
()R128: 47 ft (yel-viol-blk) resistor.
()Solder the leads to the foil and cut off the ex-
cess lead lengths.
Install components in Section 3of the circuit board
as follows:
NOTE: Be sure to position the banded end of the
diode toward the band mark on the circuit board.
If your BA-244 diodes are marked with acolor code
(red-yel-yel), position the red band toward the band
mark on the circuit board.
()D101 :BA-244 (red-yel-yel, #56-646) diode.
()D103: BA-244 (red-yel-yel, #56-646) diode.
NOTE: Occasionally, you will be directed to skip
certain components. These components will be in-
stalled later if you have the Model HWA-9 Accessory
Band Pack.
4*•*mmu'
"•*#*•
•••J%.J
•••**wM
PUSH
DOWN
AGAINST
BOARD
mum
()D119:1N458 diode (#56-24).
()SkipDl05.
()D107: BA-244 (red-yel-yel, #56-646) diode.
()Skip D109.
()D112: BA-244 (red-yel-yel, #56-646) diode.
()Skip D114 and D116.
()C181: .01 \l¥ (103) glass ceramic capacitor.

Heathkif Page 1
7
Solder the leads to the foil and cut off the ex-
cess lead lengths.
nstall components in Section 4of the circuit board
as follows:
R127: 33 kft (org-org-org) resistor.
C197: .01 jjlF (103) glass ceramic capacitor
R126: 100 kft (brn-blk-yel) resistor.
C107: .01 \lF (103) glass ceramic capacitor.
C112: .01 p,F (103) glass ceramic capacitor.
NOTE: Mount this capacitor vertically above
its outline (similar to the way you mounted
the vertical resistors earlier).
Skip C116.
C121: .01 jjlF (103) glass ceramic capacitor.
Skip C125.
C129: .01 \xF (103) glass ceramic capacitor.
Skip Cl34and C138.
R145: 680 ft (blu-gry-brn) resistor.
R143: 220 ft (red-red-brn) resistor.
R132: 10 kfl (brn-blk-org) resistor.
C191: .01 jjiF (103) glass ceramic capacitor.
Rl33: 10 kft (brn-blk-org) resistor.
C192: .01 jxF (103) glass ceramic capacitor.
C193: .01 |aF (103) glass ceramic capacitor.
C195: .01 ilF (103) glass ceramic capacitor.
D118: 1N4002 (#57-65) diode.
Solder the leads to the foil and cut off the ex-
cess lead lengths.
ns
as
ns
all components in Section 5 of the circuit board
ollows:
D102: BA-244 (red-yel-yel, #56-646) diode.
C139: .01 [iF (103) glass ceramic capacitor.
D104: BA-244 (red-yel-yel, #56-646) diode.
C141: .01 ixF (103) glass ceramic capacitor.
Skip D106 and C142.
C143: .01 fiF (103) glass ceramic capacitor.
D108: BA-244 (red-yel-yel, #56-646) diode.
Skip C144 and Dill.
C145: .01 iiF (103) glass ceramic capacitor.
D113: BA-244 (red-yel-yel, #56-646) diode.
Skip C146, D115, C147, and D117.
R148: 330 ft (org-org-brn) resistor.
C203: .01 jjlF (103) glass ceramic capacitor.
R146: 1.5 Mft (brn-grn-grn) resistor.
R147: 100 ft (brn-blk-brn) resistor.
Solder the leads to the foil and cut off the ex-
cess lead lengths.
all components in Section 6of the circuit board
as follows:
R107: 2200 ft (red-red-red) resistor.
D121: BA-244 (red-yel-yel, #56-646) diode
R109: 2200 ft (red-red-red) resistor.
D123: BA-244 (red-yel-yel, #56-646) diode
Skip Rill and D125.
R113: 2200 ft (red-red-red) resistor.

Page 1
8
Heathkit
ns
as
D127: BA-244 (red-yel-yel, #56-646) diode. Ins
as
Skip Rll5andDl29.
R117: 2200 ft (red-red-red) resistor.
D132: BA-244 (red-yel-yel, #56-646) diode.
Skip R119, D134, R121, and D136.
R144: 100 kft (brn-blk-yel) resistor.
C174: .01 jxF (103) glass ceramic capacitor.
C219: .01 p,F (103) glass ceramic capacitor.
D143: BA-244 (red-yel-yel, #56-646) diode.
Rl64: 270 a(red-viol-brn) resistor.
C216: .01 \xF (103) glass ceramic capacitor.
NOTE: Mount this capacitor vertically.
Solder the leads to the foil and cut off the ex-
cess lead lengths.
all components in Section 7 of the circuit board
ollows:
C151: .01 jxF (103) glass ceramic capacitor.
Skip C155, C159, and C164.
R171: 22 kft (red-red-org) resistor.
Rl 74: 100 ft (brn-blk-brn) resistor.
R166: 2200 ft (red-red-red) resistor. NOTE:
Mount this resistor vertically.
R162: 3300 ft (org-org-red) resistor.
C217: .01 jiF (103) glass ceramic capacitor.
R163: 1500 ft (brn-grn-red) resistor.
Rl65: 270 ft (red-viol-brn) resistor.
C214: .01 jxF (103) glass ceramic capacitor.
Solder the leads to the foil and cut off the ex-
cess lead lengths.
s
all components in Section 8of the circuit board
ollows:
C153: .01 jjlF (103) glass ceramic capacitor.
C157: .01 |xF (103) glass ceramic capacitor.
C162: .01 \xF (103) glass ceramic capacitor.
Skip C166.
*
R172: 22 kft (red-red-org) resistor.
C218: .01 p,F (103) glass ceramic capacitor.
C226: .01 |xF (103) glass ceramic capacitor.
Rl59: 270 ft (red-viol-brn) resistor.
R157: 3300 ft (org-org-red) resistor.
R158: 1500 ft (brn-grn-red) resistor.
R161: 270 ft (red-viol-brn) resistor.
R156: 470 ft (yel-viol-brn) resistor. NOTE:
Mount this resistor vertically.
Solder the leads to the foil and cut off the ex-
cess lead lengths.
all components in Section 9of the circuit board
ollows:
Rl08: 12 kft (brn-red-org) resistor.
R110: 12 kft (brn-red-org) resistor.
Skip R112.
Rl 14: 12 kft (brn-red-org) resistor.
Skip R116.
R118: 10 kft (brn-blk-org) resistor.
Skip R120 and R122.
R151: 680 ft (blu-gry-brn) resistor.
R153: 100 ft (brn-blk-brn) resistor.
!
i

Heathkit Page 1
9
Solder the leads to the foil and cut off the ex-
cess lead lengths.
nstall components in Section 10 of the circuit board
as follows:
R154: 47 kfl (yel-viol-org) resistor.
R155: 270 fl (red-viol-brn) resistor
C212: .01 jjlF (103) glass ceramic capacitor.
D122: BA-244 (red-yel-yel, #56-646) diode.
D124: BA-244 (red-yel-yel, #56-646) diode.
R169: 6800 fl (blu-gry-red) resistor.
SkipDl26.
R123: 220 H(red-red-brn) resistor.
D128: BA-244 (red-yel-yel, #56-646) diode.
Skip D131.
R168: 6800 ft (blu-gry-red) resistor.
D133: BA-244 (red-yel-yel, #56-646) diode.
R124: 220 fl (red-red-brn) resistor.
Skip D135 and D137.
D141: 1N4149 (#56-56) diode.
C209: .01 \lF (103) glass ceramic capacitor.
R152: 100 kfl (brn-blk-yel) resistor. NOTE
Mount this resistor vertically.
D142: 1N4149 (#56-56) diode.
Solder the leads to the foil and cut off the ex-
cess lead lengths.
Refer to Pictorial 1-2 (Illustration Booklet, Page 3)
for the following steps.
.parts
NOTE
strips.
NOTE: When a step directs you to install aPCB pin
in acircuit board, push the shorter end of the pin
as far as possible into the circuit board hole. Then
turn the circuit board over and solder the pin to the
foil.
SOLDER
SOLDER
FOIL SIDE OF
CIRCUIT BOARD
()PCB pin at RF.
()PCB pin at METER.
NOTE: When astep directs you to install awire
socket in acircuit board, push the tapered end of
the socket as far as possible into the circuit board
hole. Then turn -the circuit board over and solder
the socket to the foil. Try not to fill the socket with
solder.
WIRE SOCKET
TAPERED
END RIDGE
FOIL SOLDER
()Wire socket at TP101.

Page 20
NOTE: When astep directs you to install one or
more ferrite beads, use a1" small bare wire as shown
below.
FERRITE
BEAD 1" SMALL
BARE WIRE
2FERRITE
BEADS 1"SMALL
jy*- BARE WIRE
••• 2BEADS
()Two ferrite beads at FB-FB
.
NOTE: Use the same procedure to install chokes as
you do resistors.
()L121: 100 \xH (brn-blk-brn, #45-621) choke.
()Solder the leads to the foil and cut off the ex-
cess lead lengths.
Install the following parts in Section 2of the circuit
board.
()L122: 4.7 jxH (yel-viol-gold, #45-625) choke.
NOTE: Mount this choke vertically.
()L123: 4.7 u-H (yel-viol-gold, #45-625) choke.
NOTE: Mount this choke vertically.
()LI 19: 100 u.H (brn-blk-brn, #45-621) choke.
NOTE: When astep calls for solid wire, cut the wire
to the indicated length. Then remove 1/4" of insula-
tion from each end.
()W105: 7/8" violet solid wire. NOTE: Wires are
indicated on the circuit board by the following
outline:
OUTLINE COMPONENT
fNUMBER
wooo
()Solder the leads to the foil and cut off the
cess lead lengths.
Heathkit
Install parts in Section 3of the circuit board as fol-
lows:
®
()Ferrite bead at FB.
()Wire socket at TP102.
()Two ferrite beads at FB-FB
.
()PCBpinatE.
()Wire socket at GND.
()Solder the leads to the foil and cut off the ex-
cess lead lengths.
()Install four ferrite beads in Section 4of the
circuit board at the indicated locations. NOTE:
Be sure to skip the four locations indicated
on the Pictorial.
()Solder the leads to the foil and cut off the ex-
cess lead lengths.
Install parts in Section 5 of the circuit board as fol-
lows:
()W101: 1" small bare wire.
()W104: 1" small bare wire.
()L133: 2.2 p,H (red-red-gold, #45-73) choke.
()Solder the leads to the foil and cut off the ex-
cess lead lengths.
Install parts in Section 6of the circuit board as fol-
lows:
()Wire socket at TP103.
()Ferrite bead at FB.
()Solder the leads to the foil and cut off the ex-
cess lead lengths.
Install parts in Section 7of the circuit board as fol-
lows:
()W102: 1-1/4" violet solid wire.