Heathkit THE TWOER User manual

PRICE $2.00
HEATHKIT
MANUAL
1\jCopyright ,1969
Heath Company
All righrs reserved
2 -METER TRANSCEIVER
THE "TWOER"
MODEL HW-30
595-364
1-9-70

TYPICAL COMPONENT TYPES
This chart is a guide to commonly used types of elec- tions should prove helpful in identifying most parts and
tronic components. The symbols and related illustra- reading the schematic diagrams.
-I\AW/
RESISTOR CAPACITOR .'\PLATE
EN
SUPPRESSOR
SCRE
GRID TUBE
0
H-----,---; CATHODE
FILAMENT
POTENTIOMETER *TIP,
(CONTROL) 4_,- ELECTROLYTIC
CAPACITOR
(- ei
III
pPN P COLLECTOR
TRANSISTOR
BASE EMITTER
COLLECTOR
t1,,10.0 410
,---- ''4,0,/
H4- .... -
____ N",e, BASEBASENPN EMITTER kW
VARIABLE
CAPACITOR .,r',,,,,, ,,.......---"i -I .II" .:14
1TRANSFORMER
(IRON CORE).
III
I
I
TRANSFORMER
II EI
ARROW,,
IECTION OF CORE
I
INDICATES DIR-
MOVEMENT TO
INCREASE I NDUCTA
*-.:,
'.CE
-BATTERY ,,
`sivs f/if/6, NEON .----"
H.. 111
.:,-e- BULB
41C30
TRANSFORMER MNlilts
( ADJUSTABLE --«.0.'.?!
CORE) 4sol.kt,"
tooTA
PHONO
JACK o-'' 4., ,ILLUMINATING
BULB /
E,----
i
EPOWER
TRANS-
FORMER
,
-_-:-.-..__--- ,----.
----,_____. ,..-_.
O
,,42
PHONE ,_,/-:-.,,
JACK \ ,l'i,.
,-,- fi
RECEPTACLE
4') t1
INDUCTOR ''
(COIL) 00 SP S T SWITCH
(TOGGLE) 4, 4, 42
°f,, -- dr---4Ti
.......-
DPDT
.--. PIEZOELECTRIC
CRYSTAL SPEAKER SWITCH A A
(ROTARY) je,4-.;;;:.,
,' ` W r" 12 6 4P
° eglW
'7',.
00III
BIPOSTNDING ,---,:----
liP) MICROPHONE FUSE
11-
-1C
tkVib
)CONDUCTORS
GENERAL
ANTENNA -11
LOOP
/ / / / EARTH GROUND
NOT
CONNECTED CONNECTED
____ __
SHIELDED
-CHASSIS GROUND
-

Assembly
andOperation
of the
I-3 IC AM" I-3 ME I 'I' ®
2 -METER
TRANSCEIVER
THE "TWOER"
MODEL HW-30
HEATH COMPANY
BENTON HARBOR,
MICHIGAN 49022
TABLE OF CONTENTS
Specifications
Introduction
Circuit Description
Construction Notes.
Parts List
Proper Soldering Techniques.
Step -By -Step Procedure
Step -By -Step Assembly.
Mechanical Assembly. .
234679111212
Preliminary Wiring. ..14
RF Section Wiring. .17
Receiver Section Wiring. .20
Audio Section Wiring. ..22
Power Supply Section Wiring. 23
Front Panel Assembly
and Installation. ..24
Final Wiring Above Chassis 25
Final Wiring Below Chassis 26
Final Assembly. .28
Connecting Cables 29
Initial Test and Calibration. 32
Types of Antennas. .37
Installation Information.
In Case of Difficulty 40
Troubleshooting Chart 41
Factory Repair Service 43
Schematic 43*
Bibliography. . . 44
Replacement Parts Price List. 44*
*Fold -out from page.
The Heath Company reserves the right to
discontinue instruments and to change specifi-
cations at any time without incurring any
obligation to incorporate new features in instru-
ments previously sold.

Page 2
SPECIFICATIONS
TRANSMITTER SECTION
Power Input To Final RF Amplifier:
Frequency Control:.
Modulation:. ..
Output Impedance:
RECENER SECTION
Receiver Type:
Sensitivity:
Speaker Size:
Audio Power Output:
Tuning Range:
POWER SUPPLY
Power Rectifier:
Power Requirements:
ACCESSORIES
Microphone:.
Connecting Cables:
Approximately 5 watts.
8 mc to 8.22 mc quartz crystal.
Pin spacing .500".
Pin diameter .093".
FT -241 or FT -243 crystal holder.
AM plate modulation, automatically limited to not
more than 100%.
50 or 72 rt.
Superregenerative detector preceded by RF pre-
amplifier stage.
Usable with signals as low as 1 microvolt at the
antenna terminals.
3-1/2" round.
Approximately 1 watt (undistorted).
143.0 mc to 149.0 mc.
Two silicon diodes in full -wave voltage doubler
circuit.
With built-in supply:
105-125 volts 50/60 cycle AC 45 watts.
With external supply:
6 volt operation - 6 volts at 2.35 amps, 260
volts DC at 90 ma.
12 volt operation - 12 volts at1.2 amps, 260
volts DC at 90 ma.
Ceramic element type, plastic case. Suitable for
either hand or desk operation.
Two supplied, one for 105-125 volt AC operation
and one for 6 or 12 volt external DC power sup-
ply use. Power circuits are automatically
switched for internal or external power supply
use when cable is plugged in.

Page 3
GENERAL
Tube Complement: 1 - 6BA8: Oscillator/Tripler (Pentode Section)
Tripler (Triode Section)
1 - 6BA8: Doubler (Triode Section)
Final RF Amplifier (Pentode Section)
1 - 6BS8: Receiver Preamplifier and Detector.
1 - 12AX7: Speech Amplifier and First Audio
Amplifier.
1 - 6AQ5: Audio Output and Modulator
Cabinet Dimensions: 8" high (including handle).
6" deep (including knobs).
9-3/4" wide (including license holder).
Net Weight: 6-1/2 lbs.
Minor variations from these specifications may
be encountered in kit -assembled equipment. Such
factors as exact lead placement, component
variations and normal variations in tube char-
acteristics are possible sources of deviations.
Such variables will ordinarily have no significant
effect on overall performance.
INTRODUCTION
The HEATHKIT Model HW- 30 Transceiver is
a combination transmitter and receiver for use
in the 2 -meter amateur radiotelephone service.
Extensive proofbuilding and field testing over a
period of several months have provided con-
clusive evidence that the HW-30 Transceiver
will provide highly reliable service in its in-
tended application, if assembled, wired and
adjusted in accordance with the instructions
outlined in this manual. It is, therefore, re-
commended that you follow the instructions
carefully and make full use of the Circuit
Description, Block Diagrams, Schematic Dia-
gram, Installation Information, etc., in the
interest of acquiring a good understanding of
the transceiver and its capabilities.
The HW-30 Transceiver has a self-contained
power supply for operation from a 117 volt
50/60 cycle AC power line, or can be operated
from either a 6 volt or a 12 volt battery by using
an external power supply having a rating of
260 volts B+ at 90 ma.
The HW-30 can be used with a wide variety of
antenna types; an antenna should be selected
for the transceiver on the basis of the appli-
cation involved. See Page 37 for a discussion
of suitable antenna types.

Page 4
8 MC
El] OSCILLATOR
TRIPLER V5A
CIRCUIT DESCRIPTION
24 MC TRIPLER V5B 72 MC DOUBLER V4A 144 MC
O
TO POWER SUPPLY
FINAL RF
AMPLIFIER V4B
AUDIO DRIVER VIA 4
SPEECH
AMPLIFIER V1B AND MODULATOR
AUDIO OUTPUT
V2
RECEIVER V3
0
TO POWER
SUPPLY
4 -SWITCHES ON THE BASIC BLOCK DIAGRAM
HAVE BEEN SIMPLIFIED FOR EASE IN FOL-
LONING THE CIRCUIT ALL SNITCHES ARE
GANGED AND OPERATED SIMULTANEOUSLY
SHOWN IN TRANSMIT POSITION,
TRANSMITTER SECTION
TO
TRANS-
MITTER
POWER SUPPLY
The basic signal from which the final trans-
mitter output is obtained (8 mc) is generated
at 1/18 of the final output frequency in tube
section V5A. This circuit is crystal controlled
providing excellent frequency stability and is
known as an "electron coupled" Pierce oscil-
lator. "Three times" frequency multiplication
is obtained in the plate circuit by tuning the
output to 24 mc. This signal is coupled to the
following stage through C6.
Tube section V5B multiplies the 24 mc signal
again by three, providing a 72 mc signal which
is coupled to the following stage through C8.
Stage V4A is a frequency doubler which provides
an output at 144 mc to drive the final amplifier
grid.
V4B is the final amplifier and operates "straight
through;" i.e., the input and output circuits are
tuned to the same frequency. RF output is
coupled to the antenna, through C17 and the
transmit -receive switch contact, from a tap
TO
MODULATOR AND
AUDIO DRIVER
ANTENNA
/
144 M TRANSMIT -
RECEIVE
0
approximately 1/2 turn from the "cold" end of
the final tank coil L4. The actual tap point is not
critical and can be adjusted for optimum coupling
if deemed necessary. Since most antenna feed
lines will be in the vicinity of 50-75 ohms, the
suggested tap point will provide near optimum
coupling for most typical situations.
At the rear antenna terminal, there is pro-
vided a rather unique power output detector
circuit consisting of diode D1, resistor R8
and capacitor C18 and C19. This system, used
in conjunction with an external voltmeter, sup-
plies a convenient means of tuning the final
tank circuit for maximum power into the anten=
na transmission line. As the power consumed
by this device is negligible, the meter may be
left in the circuit at all times to indicate proper
operation of the transmitter. The meter jack
for this purpose is a three circuit standard
phone jack and the reading is made with the
plug inserted approximately halfway into the
jack, such that the tip of the meter plug con-
tacts only the first terminal in the jack.

Page 5
If the metering plug is inserted all the way
into the jack, the meter will read final ampli-
fier cathode current, typically in the order of
20-25 ma. The meter plug must be withdrawn
from this position for normal operation once
proper tuneup has been accomplished. The
meter plug in this fully inserted position over-
rides the normal functioning of the transmit -
receive switch and allows final amplifier plate
current to flow regardless of switch position.
With a key plug inserted all the way in the meter
jack, the transmitter may be used on CW if
desired, although considerable "back wave" may
result due to the fact that previous transmitter
stages are running constantly.
For phone operation, modulation is accomplished
by causing the plate and screen voltage source
for V4B to vary at the audio frequency rate
determined by the signal being passed through
the combination modulation -output transfor-
mer (see AUDIO SECTION description).
RECEIVER SECTION
The incoming signal received by the antenna
and arriving at the antenna connector via the
transmission line is supplied to an impedance
matching tap on coil L5, through capacitor C20.
The resultant signal appearing across the broad-
ly tuned circuit consisting of L5 and C21 is fed
to the input of the RF amplifier stage V3A.
The output circuit of the RF amplifier is "im-
pedance coupled" to the cathode circuit of the
superregenerative detector V3B through capac-
itor C24. This arrangement provides consider-
able gain in the RF stage, which does not re-
quire neutralization as the feed point in the
detector circuit is relatively low impedance.
This means of coupling these two stages elimi-
nates the most trying problem in most super-
regenerative detectors in that a condition re-
ferred to as "suck -out" can occur where a
tuned circuit is not properly isolated from the
detector. In other instances where a tuned cir-
cuit (it may be a coil and capacitor combin-
ation or reflected antenna tuning) is closely
coupled, the detector will drop out of oscillation
as detector tuning passes the resonant fre-
quency of the interfering tuned circuit. In
addition to solving the above problem and pro-
viding gain, the RF amplifier also isolates the
antenna from the oscillating detector, mini-
mizing re -radiation from the detector into
the antenna.
The type of detector used is one which pro-
vides the most sensitivity for the number of
components required and is superregenerative.
In a straight regenerative detector, consider-
able sensitivity is achieved by adjusting the
signal feedback of the detector for a near
oscillating condition. In the regenerative cir-
cuit, the more feedback that can be employed
with stable operation short of the detector
actually going into oscillation, the greater will
be the gain.
The superregenerative detector employed here
carries the regenerative principle one step
further in that the detector actually goes in
and out of oscillation at a controlled rate.
In doing such, the detector periodically passes
through the point of maximum gain (just prior
to oscillation) and therefore provides optimum
gain from its circuit. This periodic rate, re-
ferred to as the "quench" frequency, is con-
trolled by the value of RFC5, and associated
components, and is in the vicinity of 20,000
cycles per second; therefore, the quench fre-
quency is inaudible. The detector circuit is
essentially a Colpitts type of oscillator circuit
in which interelectrode tube and stray capac-
ities form the normal feedback path. The detec-
tor cathode and heater are placed above RF
ground by RF chokes RFC3 and RFC4. The
plate circuit is bypassed for RF by C29.
The rear apron mounted 250 Ka linear po-
tentiometer Rh is adjusted for maximum sen-
sitivity by setting the value of B+ voltage at the
detector plate. The receiver configuration is
one of very good sensitivity. Three micro-
volts input will produce near complete quiet-
ing with usable signals extending down to 1/2
microvolt.
AUDIO SECTION
The detected audio signal passes through C30
to the 1 megohm volume control R13. Signal
flow proceeds through the audio mixing resistor
R22 to the grid of the audio driver VIA which is
coupled to the power output stage V2 by capac-
itor C35. The combination modulation -output
transformer T2 provides proper impedance
matching to the speaker with the unit operating
as a receiver. With the transmit -receive switch
in the receive position, no loading of the audio
output occurs at the primary modulation tap
because the cathode circuit of the transmitter
final amplifier is open. During receive, tubes
V5, V4 and section V1B are inoperative.

Page 6
During transmit conditions, only tube V3 is
switched out of the circuit, with all other circuits
operating. B+ is supplied to V5, V4A and V1B
while the cathode of the final amplifier V4B
is returned to ground. With B+ removed from
the receiver section V3, no audio voltage appears
across the volume control R13 and only the
signal which is amplified by the microphone pre-
amplifier V1B reaches the grid of the audio
driver stage V1A.
External radio frequency energy is prevented
from re-entering the audio circuitry via the
microphone cable through the use of RF choke
RFC6 and capacitor C41 in the microphone in-
put circuit. In transmit, the volume control will
have negligible effect on the amount of audio
impressed on the RF carrier, the volume control
being isolated by resistor R22. It will be found
that fixed gain in the microphone audio circuit is
adequate for all normal transmit conditions.
POWER SUPPLY SECTION
The internal power supply provides the voltages
necessary for proper operation from any 105-
125 volt 50/60 cycle source. The B+ voltage is
produced in a full -wave voltage doubler circuit
consisting of D2, D3, C31 and C32. This DC
voltage is then filtered by C33A and C33D, and
distributed to the proper circuit points. Approx-
imate B+ requirements are 260 volts 45 ma
during receive and 90 ma during transmit.
The power connector on the chassis rear apron
permits operation from any external source
offering the proper voltages. The filament wiring
is so arranged that the tubes are connected for
either 6 or 12 volt operation, depending upon
which power cable is in use. For 117 V AC
operation, the power transformer provides 6.3 V
AC for parallel wired filaments.
CONSTRUCTION NOTES
This manual is supplied to assist you in every
way to complete your kit with the least possible
chance for error. The arrangement shown is
the result and
trial. If followed carefully, the result will be a
stable instrument, operating at a high degree
of dependability. We suggest that you retain the
manual in your files for future reference, both
in the use of the instrument and for its main-
tenance.
UNPACK THE KIT CAREFULLY AND CHECK
EACH PART AGAINST THE PARTS LIST. In so
doing, you will become acquainted with the parts.
Refer to the charts and other information on the
inside covers of the manual to help you identify
the components. If some shortage or parts
damage is found in checking the Parts List,
please read the REPLACEMENT section and
supply the information called for therein.
Resistors generally have a tolerance rating of
10% unless otherwise stated in the Parts List.
Tolerances on capacitors are generally even
greater. Limits of +100% and -20% are common
for electrolytic capacitors.
We suggest that you do the following before work
is started:
1. Lay out all parts so that they are readily
available.
2. Provide yourself with good quality tools.
Basic tool requirements consist of a screw-
driver with a 1/4" blade; a small screw-
driver with a 1/8" blade; long -nose pliers;
wire cutters, preferably separate diagonal
cutters; a pen knife or a tool for stripping
insulation from wires; a soldering iron (or
gun) and rosin core solder. A set of nut
drivers and a nut starter, while not neces-
sary, will aid extensively in construction of
the kit.

Page 7
Most kit builders find it helpful to separate the
various parts into convenient categories. Muffin
tins or molded egg cartons make convenient
trays for small parts. Resistors and capaci-
tors may be placed with their lead ends in-.
serted in the edge of a piece of corrugated
cardboard until they are needed. Values can
be written on the cardboard next to each
component. The illustration shows one method
that may be used.
Refer to Parts Pictorial on fold -out from page
11.
PART
No. PARTS
Per Kit
Resistors
1-9 1
1-14 2
1-23 1
1-26 3
1-27 2
1-29 1
1-30 2
1-33 2
1-40 2
1-42 1
1-60 2
1-66 1
1-4-1 1
1-5-1 1
1-9-1 1
1-12-2 1
3-19-5 1
PARTS LIST
To order replacement parts, refer to the Replacement Parts
Price List and use the Parts Order Form furnished with this
kit.
DESCRIPTION
1000 E2 1/2 watt
(brown -black -red)
3300 E2 1/2 watt
(orange -orange -red)
27 Kn 1/2 watt
(red -violet -orange)
100 Ks2 1/2 watt
(brown -black -yellow)
150 Kf2 1/2 watt
(brown -green -yellow)
220 KO 1/2 watt
(red -red -yellow)
270 Kf2 1/2 watt
(red -violet -yellow)
470 Ks2 1/2 watt
(yellow -violet -yellow)
10 megohm 1/2 watt
(brown -black -blue)
270 E2 1/2 watt
(red -violet -brown)
68 KO 1/2 watt
(blue -gray -orange)
150 n 1/2 watt
(brown -green -brown)
8200 s-2 1 watt
(gray -red -red)
22 KO 1 watt
(red -red -orange)
10 KO 1 watt
(brown -black -orange)
470 E2 2 watt
(yellow -violet -brown)
330 E2 5 watt
PART PARTS
No. Per Kit
Capacitors
20-52 2
20-97 2
20-99 1
21-14 24
21-16 1
21-28 5
21-29 1
21-59 1
21-70 1
25-57 2
25-86 1
26-71 1
31-7 1
DESCRIPTION
7.5 µpi silver mica
50 µpi silver mica
22 µIA silver mica
.001 µfd disc ceramic
.01 µid disc ceramic
10 µµf tubular ceramic
4.7 µIA tubular ceramic
.001 µfd ceramic
feed -through, 1000 V
.01 AM 1400 volt
disc ceramic
100 µfd 200 volt electrolytic
40-40-25-25 µfd at450-350-
25-25 volt electrolytic
3 µµf variable tuning
capacitor
2.5 to 6 µµf trimmer
Transformers -Coils
51-94 1Combination modulation and
output transformer
54-87 1Power transformer
141-9 1Coil set
Consisting of:
40-186 1
40-332 1Oscillator plate coil
Tripler coil
40-333 2Detector and doubler coil
40-334 1Antenna coil
40-335 1Final tank coil
45-37 5RF choke
45-48 1RF choke

Page 8
PART PARTS DESCRIPTION
No. Per Kit
Terminal Strips -Sockets -Plugs
431-1 11 -lug terminal strip
431-5 14 -lug terminal strip
431-10 13 -lug terminal strip (large)
431-14 12 -lug terminal strip
431-38 23 -lug terminal strip (small)
431-40 24 -lug terminal strip
432-1 1Microphone connector (cable)
432-3 1Microphone connector
(chassis)
434-4 2Octal socket
434-15 17 -pin socket
434-38 1Crystal socket
434-42 1Phono socket
434-75 39 -pin ceramic socket
434-77 19 -pin wafer socket
435-1 1Octal socket ring
436-6 13 -circuit phone jack
438-3 1Phone plug
438-4 2Phono plug
438-22 1Octal plug
440-1 2Octal plug cap
Controls -Switches
10-59 1250 KO linear
(REGENERATION)
19-27 11 megohm audio with SPST
switch (VOLUME -ON -OFF)
63-210 13 -position, 4 -circuit,
TRANSMIT -RECEIVE
switch
Diodes -Tubes -Lamps
56-26 1
57-27 2
411-26 1
411-60 1
411-98 2
411-121 1
412-1 1
412-36 2
Metal Parts
90-111 1
200-280-1 1
203-181-4 1
205-167-1 1
209-25 1
Crystal diode
Silicon diode
12AX7 tube
6AQ5 tube
6BA8 tube
6BS8 tube
#47 pilot lamp
NE -2E neon lamp
Cabinet
Chassis
Front panel
Speaker baffle plate
Speaker grille
PART PARTS DESCRIPITION
No. Per Kit
Wire
340-3
344-58
344-2
1Length #16 bare wire
1Length #22 gray hookup wire
1Length #18 stranded black
wire
344-3 1Length #18 stranded r al wire
346-1 1Length sleeving
347-9 1Length 3 -conductor shielded
cable
Hardware
250-10
250-26
250-49
250-51
250-56
250-89
250-136
250-172
252-1
252-3
252-7
252-22
252-23
252-32
253-10
253-21
254-1
254-4
254-7
259-1
259-11
46-32 x 1/2" screw
16-32 x 5/8" screw
83-48 x 1/4" screw
2#10 x 3/8" sheet metal screw
76-32 x 1/4" screw
12 6-32 x 3/8" screw
13-48 x 1/2" screw
23-48 x 3/8" screw
11 3-48 nut
20 6-32 nut
5Control nut
4#6 speednut
16-32 thumbnut
2Speednut
5Flat control washer
6Flat washer
24 #6 lockwasher
4Control lockwasher
12 #3 lockwasher
3#6 solder lug
3#6 spade terminal
Miscellaneous
72-173-4
89-1
211-16
2.61-9
391-5
401-21
413-10
413-11
421-1
421-4
423-1
462-85
462-86
480-8
481-1
391-34
597-260
23/8" rubber grommet
15/16" rubber grommet
1Line cord
1Plastic handle
4Rubber foot
1Nameplate
1Speaker
1Red lens
1Clear lens
11-1/2 ampere fuse
18 ampere fuse
1Fuse holder
2Knob w/gold insert and
indicator dot
1Knob lever type w/gold in-
sert and indicator line
1Microphone
14 -prong capacitor mounting
wafer
1Blue and white identification
label
1Parts Order Form
1Manual (See front cover for
part number. )
Solder

Page 9
ROSIN CORE SOLDER HAS BEEN SUPPLIED WITH THIS KIT. THIS TYPE OF SOLDER
MUST BE USED FOR ALL SOLDERING IN THIS KIT. ALL GUARANTEES ARE VOIDED
AND WE WILL NOT REPAIR OR SERVICE EQUIPMENT IN WHICH ACID CORE SOLDER
OR PASTE FLUXES HAVE BEEN USED. IF ADDITIONAL SOLDER IS NEEDED, BE SURE
TO PURCHASE ROSIN CORE (60:40 or 50:50 TIN-LEADCONTENT) RADIO TYPE SOLDER.
PROPER SOLDERING TECHNIQUES
Only a small percentage of HEATH KIT' equip-
ment purchasers find it necessary to return an
instrument for factory service. Of these instru-
ments, by far the largest portion malfunction
due to poor or improper soldering.
If terminals are bright and clean and free of wax,
frayed insulation and other foreign substances,
no difficulty will be experienced in soldering.
Correctly soldered connections are essential if
the performance engineered into a kit is to be
fully realized. If you are a beginner with no
experience in soldering, a half hour's practice
with some odd lengths of wire may be a worth-
while investment.
For most wiring, a 25 to 100 watt iron or its
equivalent in a soldering gun is very satisfactory.
A lower wattage iron than this may not heat the
connection enough to flow the solder smoothly
over the joint. Keep the iron tip clean and bright
by wiping it from time to time with a cloth.
CHASSIS WIRING AND SOLDERING
1. Unless otherwise indicated, all wire used
is the type with colored insulation (hookup
wire); the size of the conductor is the same
for all colors of hookup wires furnished with
this kit. In preparing a length of hookup wire,
1/4" of insulation should be removed from
each end unless directed otherwise in the
construction step.
2. To avoid breaking internal connections when
stripping insulation from the leads of trans-
formers or similar components, care should
be taken not to pull directly on the lead. In-
stead, hold the lead with pliers while it is
being stripped.
3. Leads on resistors, capacitors and similar
components are generally much longer than
they need to be to make the required con-
nections. In these cases, the leads shouldbe
cut to proper length before the part is added
to the chassis. In general, the leads should
be just long enough to reach their termin-
ating points.
4. Wherever there is a possibility of bare leads
shorting to other parts or to the chassis, the
leads should be covered with insulating
sleeving. Where the use of sleeving is spe-
cifically intended, the phrase "use sleeving"
is included in the associated construction
step. In any case where there is the pos-
sibility of an unintentional short circuit,
sleeving should be used. Extra sleeving is
provided for this purpose.

Page 10
CRIMP WIRES HEAT CONNECTION
COLD SOLDER JOINT
-CONNECTION INSUFFICIENTLY CONNECTION
HEATED
APPLY SOLDER
PROPER SOLDER
5. Crimp or bend the lead (or leads) around the
terminal to form a good joint without rely-
ing on solder for physical strength, unless
otherwise instructed in the STEP- BY -STEP
ASSEMBLY. If the wire is too large to allow
bending or if the step states that the wire
is not to be crimped, position the wire so
that a good solder connection can still be
made.
6. Position the work, if possible, so that gravity
will help to keep the solder where you want
it.
7. Place a flat side of the soldering iron tip
against the joint to be soldered until it is
heated sufficiently to melt the solder.
ALLOW SOLDER
TO FLOW
COLD SOLDER JOINT
CONNECTION MOVED
WHILE COOLING
8. Then place the solder against the heated
terminal and it will immediately flow over
the joint; use only enough solder to thor-
oughly wet the junction. It is usually not
necessary to fill the entire hole in the
terminal with solder.
9. Remove the solder and then the iron from
the completed junction. Use care not to move
the leads until the solder is solidified.
A poor or cold solder joint will usually look
crystalline and have a grainy texture, or the
solder will stand up in a blob and will not have
adhered to the joint. Such joints should be re-
heated until the solder flows smoothly over the
entire junction. In some cases, it may be neces-
sary to add a little more solder to achieve a
smooth bright appearance.

Page 11
STEP-BY-STEP PROCEDURE
The following instructions are presented in a
logical step-by-step sequence to enable you to
complete your kit with the least possible con-
fusion. Be sure to read each step all the way
through before beginning the specified operation.
Also read several steps ahead of the actual step
being performed. This will familiarize you with
the relationship of the subsequent operations.
When the step is completed, check it off in the
space provided. This is particularly important
as it may prevent errors or omissions, espe-
cially if your work is interrupted. Some kit
builders have also found it helpful to mark each
lead in colored pencil on the Pictorial as it is
added.
The fold -out diagrams in this manual may be
removed and attached to the wall above your
working area; but, because they are an integral
part of the instructions, they should be returned
to the manual after the kit is completed.
In general, the illustrations in this manual
correspond to the actual configuration of the
kit; however, in some instances the illustra-
tions may be slightly distorted to facilitate
clearly showing all of the parts.
The abbreviation "NS" indicates that a con-
nection should not be soldered yet as other
wires will be added. When the last wire is
installed, the terminal should be soldered and
the abbreviation "S" is used to indicate this. Note
that a number will appear after each solder
instruction. This number indicates the number of
leads that are supposed to be connected to the
terminal in point before it is soldered. For
example, if the instruction reads, "Connect a
lead to lug 1 (S-2)," it will be understood that
there will be two leads connectedto the terminal
at the time it is soldered. (In cases where a lead
passes through a terminal or lug and then con-
nects to another point, it will count as two leads,
one entering and one leaving the terminal.)
The steps directing the installation of resistors
include color codes to help identify the parts.
Also, if a part is identified by a letter -number
designation on the Schematic, its designation
will appear in the construction step which directs
its installation.

lla
1/2 WATT RESISTOR
SILVER MICA CAPACITOR
'EUED=1 ---1133Z
1 WATT RESISTOR 2 +VATT RESISTOR
DISC CERAMIC CAPACITOR
#25-57 TUBULAR
ELECTROLYTIC CAPACITOR
#40-186
OSCILLATOR
PLATE COIL
#45-48
75 mh RF CHOKE
#40-332
TRIPLER COIL
#40-335
FINAL TANK COIL
#440-1 OCTAL PLUG CAP
TUBULAR CAPACITOR
#25-86 TWIST PRONG CAPACITOR
#40-333
DETECTOR COIL OR
DOUBLER COIL
#45-37
1.8 u.h RF CHOKE
#40-334
ANTENNA COIL
CERAMIC CAPACITOR
#438-22 OCTAL PLUG
#56-4 CRYSTAL DIODE
#57-27 SILICON DIODE
#434-4 OCTAL SOCKET
PARTS PICTORIAL

llb
#26-71 TUNING CAPACITOR
#63-210
TRANSMIT -RECEIVE SWITCH
#31-7 FINAL TANK CAPACITOR
#434-77 9 -PIN
MINIATURE WAFER SOCKET
#434-15 7 -PIN
MINIATURE WAFER SOCKET
#412-36 NEON LAMP
#434-38 CRYSTAL SOCKET
SPEAKER BAFFLE PLATE
#438-3 PHONE PLUG
#423-1 FUSE HOLDER
ago oi
#432-1 MICROPHONE
CONNECTOR (CABLE)
#462-86 KNOB
#435-1
OCTAL SOCKET RING
#434-75
9 -PIN CERAMIC SOCKET
#10-59 CONTROL
#436-6 PHONE JACK
#421-1 FUSE
#432-3 MICROPHONE
CONNECTOR (CHASSIS)
#462-85 KNOB
#391-5 NAMEPLATE
#481-1 4 -PRONG CAPACITOR
MOUNTING WAFER
PARTS PICTORIAL

11c
IMMO Immose
6-32 x 1/2" SCREW 6-32 x 5/8" SCREW 3-48 x 1/4" SCREW #10 x 3/8" 6-32 x 1/4" SCREW
SHEET METAL SCREW
6-32 x 3/8" SCREW 3-48 x 1/2" SCREW
06-32 NUT
PILOT LIGHT SPEEDNUT
CONTROL LOCKWASHER
#6 SOLDER LUG
#261-1
RUBBER FEET
OCONTROL NUT
OMMINN
3-48 x 3/8" SCREW
#6 SPEEDNUT
00
CONTROL WASHER 9/16" FLAT WASHER
0#3 LOCKWASHER
#6 SPADE TERMINAL
30
#73-1
3/8" GROMMET
#434-42
PHONO SOCKET
0(ca o
#431-40
4 -LUG TERMINAL STRIP #431-1
1 -LUG TERMINAL STRIP
0q 0 0O.:
#431-10
#431-5 3 -LUG TERMINAL STRIP
4 -LUG TERMINAL STRIP
O3-48 NUT
6-32 KNURLED THUMBNUT
0#6 LOCKNASHER
#73-4
5/16" GROMMET
#438-4 PHONO PLUG
07
%ea,
#431-38
3 -LUG TERMINAL STRIP
#431-14
2 -LUG TERMINAL STRIP
PARTS PICTORIAL

Page 12
STEP-BY-STEP ASSEMBLY
MECHANICAL ASSEMBLY
Refer to Pictorial 1for the following steps.
(Referring to Detail 1A, mount a 9 -pin wafer
tube socket at Vl. Secure 3 -lug terminal
strips Q and R to each mounting screw.
Use the 3-48 x 3/8" screws, #3 lockwash-
ers, and 3-48 nuts. Be sure to orient the
blank spaces of the tube sockets according
to the arrows in Pictorial 1.
() Mount the 7 -pin wafer socket V2. Use 3-48
x 1/4" screws, #3 lockwashers and 3-48 nuts.
() Similarly mount the 9 -pin ceramic tube
sockets at V3, V4, and V5. Make sure the
blank spaces are as shown in Pictorial 1.
() Mount the crystal socket at location M.
Use the 3-48 x 1/2" screw with a #3 lock-
washer under the screw head. Secure with
a 3-48 nut. Do not overtighten the mounting
screw or you may crack the socket.
) Install a 3/8" rubber grommet at locations
H and J.
() Similarly install a 5/16" rubber grommet
in hole U.
() Locate the octal power plug (#438-22) and
the retaining ring (#435-1). Referring to De-
tail 1B, mount the octal plug at C. Position
the key on the power plug so that it is point-
ing toward the bottom edge of the flange. Se-
cure the plug with the retaining ring.
() Mount the 250 KEZ control B. Referring to
Detail 1C, secure the control by twisting
each mounting tab approximately 1/4 turn
with long -nose pliers.
PLACE THE CONNECTOR INTO
THE CHASSIS HOLE AS SPECIFIED
IN THE STEP. PULL THE OVERLAPPING ENDS
OF TEE RING APART AND PLACE
THEM INTO THE GROOVE OF THE
CONNECTOR.
Alt3 LOCKWASHER
(11) 3-48X* SCREW
Detail lA
Detail 1C
PRESS DOWN WITH SCREWDRIVER
IN THE TWO LOCATIONS SHOWN
TO ASSURE PROPER SEATING IN
THE FRONT HALF (OF THE CON-
NECTOR).
Detail 1B
NOT MORE
THAN 90'
PRESS BACK OF RING DOWN INTO
GROOVE AND THEN ALL THE WAY
AROUND, TO BE SURE IT IS SEAT-
ED PROPERLY.

17 a
1
MOD/ OUT. TRANS. 1
-#51-94 imi+,..
1
_ _ ,
p34 5 S
POWER TRANS.
ow 54 - 87
en
Pictorial 1

1 2b
POWER TRANS.
otg 54 - 87
e3
Pictorial 1

Page 13
Detail 1D
6-32XSV
SCREW
MODULATION
AUDIO OUTPUT
TRANSFORMER
(#51-94)
() Referring to Detail 1D, mount fuse holder A.
Use the hardware that is furnished with the
fuse holder. Bend lug 2 of the fuse holder up
slightly so that a wire can be connected to it
later. Install one of the 1-1/2 ampere fuses
in the fuse holder.
Cut the power transformer leads (#54-87) to the
following lengths. Strip 1/4" of insulation from
the end of each wire (unless directed otherwise)
and tin the wire. ("Tin" means to melt a small
amount of solder on the bare end of the wire.)
Color Length
() Either black 5-3/4"
() Other black 5-3/4"*
() Either green 4-1/2"*
() Other green 3-1/4"
The red wires are of the proper length
and need not be cut.
*Remove 5/8" of insulation.
Similarly, prepare the combination modulation -
audio transformer (#51-94) leads to the following
lengths:
Color Length
() Brown 3-1/2"
() Red 4-3/4"
() Blue 3-3/4"
() Black 3-1/2"
()Yellow 3-1/2"
6-32X V4
SCREW
YELLOW
RED
BLUE
BROWN
*6 LOCKWASHER
6-32 NUT
*6 LOCKWASHER
(4L
Detail lE
6-32 NUT
Referring to Detail 1E, mount the combina-
tion modulation- audio (#51-94) transformer
and 3 -lug terminal strip N. Orient the trans-
former so that the red, blue andbrown leads
are next to grommet H. Place a 6-32 x 3/8"
screw through the transformer mounting
foot, then through the chassis. Slip a #6 lock -
washer and 3 -lug terminal strip N over the
screw. Secure the screw with another #6
lockwasher and 6-32 nut.
Now, secure the other mounting foot with a
6-32 x 1/4" screw, #6 lockwasher and 6-32
nut.
() Similarly, mount the power transformer
(#54-87), 4 -lug terminal strip K and 1 -lug
terminal strip L. Orient the power trans-
former so that the red and green wires are
located close to grommet J. Use 6-32 x
3/8" BHMS. See Pictorial 1 and the fold -out
Figure 8 (Page 32).