Heathkit HW 9 Manual

Page 1

HEATHKIT"
MANUAL

HEATH COMPANY - BENTON HARBOR, MICHIGAN

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STEP-BY-STEP ASSEMBLY

Refer to Pictorial 1~i [illustration Booklet, Page 2)
as you read the following notes and steps.

and solder the leads to the foil on the other side
unless a step specifically directs you otherwise.

NOTES: 1 1 C176: Hold a .0] uF (103) glass ceramic

1. Many circuit board drawings. such as the one
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 a specific series of steps.

2. Refer to the Taped Components Chart." Note
that it is divided into numbered sections that
match the sections on the circuit board.

3. Each series of steps has you installing parts
in a top-to-hottom. 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.

4. Check off each step as you perform it. You
may also wish to place a check mark near each
component on the Pictorial as you install it.

(

capacitor as shown and bend the leads straight
down to fit the hole spacing on the circuit
board.

) Start the leads into the holes at the capacitor's

location at the top of Section 1 of 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:

5. In general. solder instructions are given only
at the end of a series of similar steps. You COMPONENT COMPONENT
may solder more often. it you destre. OUTLINE NUMBER OUTSNE NUMBER
- cone
in the following steps. you will be given detailed on < E)
instructions on how to install and solder the first ag'l-Jzflllg" VERTICAL
part on the circuit board. Read and perform each MOUNTING

step carefully. Then use the same procedure when-
ever you install parts on a circuit board.

Note that the circuit board has fail on one side
and component outlines on the other. The side
with the component outlines is referred to as
the "component side.

I 1

Position the circuit board as shown in the Pictorial
with the component side up. Always install compo-
nents on the component side of the circuit board.

I

)

Press the capacitor against the circuit board.
Then bend the leads outward slightly to hold
it in place.

@ maxfi s\

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[ ) C187: 510 pF ceramic.
( ] C185151D pF ceramic.
( ) C183: 510 pF ceramic.

[ ) Solder the leads to the toil and cut off the ex-
cess lead lengths,

Install capacitors in Section 4 of the circuit board
aslollows.

( ] C106: 300 pF mica.
( ) C111:180 [31" mice.

[ ] Skip C115.

[ ) (31191160 pF mica.

[ ] Skip C124.

( l C128: 90 pF mica.

[ ) SkipC183 and C137.

[ ) Solder the leads to the toil and cut off the ex.
cess lead lengths.

tnstall capacitors in Section 5 of the circuit board
as follows:

( ) C149:115 pF mica.
( ] Skip C154. 0153. and C163.
[ ) 0175:4712]: ceramic.

l ) Solder the leads to the foil and cut off the ex-
cess lead lengths.

Install capacitors in Section 6 of the circuit board
astollows:

l ] C152:100pF[iOOK]ceramic.

[ ] C156:47cheramjc.

l ) C161124 pF ceramic.

1 1 Skip C165.

[ ] C223: 680 pF ceramic.

( ] C221: 220 pF ceramic.

l ) C222: 270 pF ceramic.

[ ) C225: 75 pF ceramic.

( ] C215: .001 uF (1000 pF] ceramic.
l ) C213: 33 pF ceramic.

[ ) Solder the leads to the foil and cut oil the ex-
cess lead lengths.

Install capacitors in Section 7 of the circuit board
aslollows:

( ) C163: 10 cheramic.
( ) C167: 5 pl ceramic.
[ ) C172:10cheramic.
( ) C171:5 pF ceramic.
[ ] C169: 6 pF ceramic.
( ] C173: 5 pF ceramic.
[ ] C205: 75 pF mica.

( ) C211: 10 cheramic.
( ] C206: 100 pF mica.

( ] C207: 50 pF mica.

( ] C206: 50 pF mica.

( ] Solder the leads to the foil and cut off the ex-
cess lead lengths.

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T/R CIRCUIT BOARD

PARTS LIST

Remove the parts from Pack #2. Then check each
part against the following list. Do not remcve com-
ponents that are supplied on a tape from the tape
until you use them in a step. Return any part that
is packed in an individual envelope, with Lhe part
number on it, back to the envelope after you identify
it until that part is called {or in a step. Do not throw
away any packing material until all of the parts are
accounted for.

To order a replacement part, always include the
PART NUMBER. Use the Parts Order Form lur-
nished with this kit. If 3 Parts Order Form is not
available. refer to Replacement Parts inside the
rear cover of this Manual. For prices. refer to the
separate Heath Parts Price List."

TAPED COMPONENTS

NOTE: These parts are taped on a strip which was checked
before shipment. Since these parts are taped in the order
of assembly. you may not wish to check them against the
tollowing list.

HEATH OTV. DESCRQPTION CIRCUIT HEATH QTY. DESCRIPTION CIRCUIT
Part No. Comp. No. Fan No. Comp. No_
RESISTORS Resistors (Contd)
. e101 .12 7 100 nmmetk-bm) R301 , H341.
NOTE: The Iallowmg resistors are rated at Int-wart and have R345, R346.
a tolerance of 5% unless omenmse listed. A 5% tolerance R405fi406.
is indicated by e tourth oalor band at goldl H413
sum-12 I 160 n (bm~gry-bm) R444
5221.12 3 220 n (rad~red-Drn) mos, H311.
Rm
6-27942 1 2.7 n (mama-gold) Rug: _ _ R419
522042 2 zzmwm-w mums 3331.1: 1 3332533333 m
7°42 7 n (V°""l°"°) R339 Hat-12 3 530 n (blu-gry~brn) 9332 Fin 7.
663042 I sen (blu-gry-blk) 932. '

F0426

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Page 37

Refer to Pictorial 2-4 (illustration Booklet. Page 11}
for the following steps.

NOTE: Solder the leads of each of the following parts
to the toil and out off any excess lead lengths as
you install it.

Install parts in Section 1 of the circuit board as fol-
lows.

( ) Q405: MRF237 transistor (#417-912). Be sure
to match the lead spacing on the transistor
with the hole spacing on the circuit board
[when you have the transistor properly in-
stalled. its tab will be positioned as shown on
the Pictorial]. Mount this trensintor down
against the circuit board.

( 1 Q4oo: MRF237 transistor (#417-912]. Mount
this transistor down against the circuit board.

Install parts in Section 2 of the circuit board as fol:
lows:

{ ) Q404: 2N3866 transistor (#417-205]. Mount
this transistor down against the circuit board.

NOTE: Mount the following transistors 1/4" above
the circuit board.

( ] Q4103: MPSASS transistor (#417-365). Be sure
to match the flat on the transistor with the flat
part of the outline on the circuit board,

( 1 (1401: MPseszi transistor (#417472) and tie"
x 1/3 ferrite bead. Slide the ferrite head onto
the base lead (center lead] as shown below be-
fore you install this transistor.

BASE(B)
LEAD

FEHRITEN
BEAD '

[ ) Q402: MPSAGSZ] transistor [#4174723 and
1/8 x 1/8 ferrite beadi Slide the bead onto
the base lead (center lead] before you install
this transistor.

Install parts in Section 3 of the circuit board as fol~
lows:

( ) 0302:MPFlOStronsistor(#417-169].
[ ) Q4112:X29A829transistor[#417-201).

[ ) U402: 781m integrated circuit (#442-631). In-
stall this IC the same as you install transistors.

[ ] Q4ii:MP5A20Lransistor(#4i7-801).

( ) 0409: M11317] transistor (#417-819). Match
the metal side of the transistor with the double
line on the circuit board. Start the transistor
leads into their corresponding circuit board
holes and push the transistor down until the
wider part of the leads touch the circuit board.
Then solder the leads to the foil and cut off
any excess lead lengths.

DOUBLE
LINE

( ) Q407:XZQABZQtxansislor(#417-201].

[ ) Q408: MIE171 transistor [#4t7~819). Be sure
to match the metal side of the transistor with
the double line on the circuit board.

install parts in Section 4 of the circuit board as fol-
lows:

( ) Q1401:WFlosu-ensistorMaU-EQ).
( ] Q303:MP5A20transistorM417-801).

install part in Section 5 of the circuit board as fol-
lows:

[ ] U303: MCHOBG integrated circuit [#442-96).
Be sure to match the tab on this lC with the
tab shown on the circuit board outline. Then
start the leads into their corresponding circuit
board holes. Position the IC 1/4" above the cir-
cuit board before you solder the leads to the
foil.

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[ ) T403: 6.5 p. toroid coil [#40-2113]. Be sure
the twisted pair of leads go into tlle hole that
is inside the outline on Lhe circuit board
(labeled 3.4], and the single leads go into holes
1 and 2 as shown.

SiNGLE
LEAD I TWISTED
PAIR
_ l
- '2...
l ) Skipmls.

t ) L413: .71 .111 call [#40-2073].
[ ) Skip L411.

( 1 L403: .9 pH coil [#40-2072).
( ) Skip L417. L415. and L414.

[ ) 111121.71 ill-l coil (#40-2073).
( ) Skip L409.

l ) L407:.9uHcoil(#40-2072).

Install parts in Section 2 of the circuit board as fol-
lows:

( ) L433: 3 pH toroid coil (#40-2112],
[ ) L435: 1.3 pH toroid coil [#40-2113),
[ ] L434:1.8 pH toroid coil (#40-2113].
( ) L432: 3 H toruid coil [#40-2112).

[ ] L431: 3 pH toroid coil [#40-21 12).

( ) Install two 5/16" x 5/16" ferrite beads on a
1-1/2" large bare wire at FBAFB. Use pliers to
bend the wire to lit the circuit board holes.

I ) Skip L406.

[ J L404: 3 pH coil [#404070).

[ ) M0213 uH coil [#404069].

I ) Skip LAOS.

[ ) L403: 3 pH coil [#40-2070).

( ) Skip T401.

[ ) L401:13 pH coil (#404069).

Install parts in Section 3 of the circuit board as fol-
lows:

I ) U401: Double-balanced mixer [#150-72). Be

sure pin 1 (marked with a blue dot] goes into
hole 1 in the circuit board as shown on the

Pictorial.
il-q_q_ul

BLU PlN t

I

( ] T301:10.7MI-Iztranslormer[#52-193).

Install parts in Section 4 of the circuit board as fol-
lows:

( ) FL301: 3.830 MHZ crystal filter (#404-640).
NOTE: Disregard any In and Out printing that
may be on your filter. The filter can be in-
stalled either way in the circuit board.

{ ) T302:10.7 MHztranslorrrler[#52-193).

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[ ) Refer to Detail 2~9D and similarly mount a l )
band switch shield to rotary switch 1iW402 as
shown. Be sure to mount the shield on the cotv
rect side of the switch as shown.

[ ) Refer to Detail 2-95 (Illustration Boodet. Page
17) and rotate the center portions of switches
SW404. SW403. SW402. and SW40] so the
notch is positioned as shown. Then slide the
7" shaft through the centers of these switches
as shown.

[ l Push the band switch shields down tight
against the circuit board. Make sure the
shields and switches are perpendicular to the
circuit board, Then solder the two tabs on each
shield to the foil.

4-40 NUT

44 LOCKWASHER
63

Detail 2-9D

Refer again to Detail 2-9E and use the follow.
ing procedure to install the PA shield on the
circuitboard:

1. Position the PA shield as shown in the
Pictorial [note the location of the small
hole in the shield). Then make sure the
tabs on the top of this shield enter the
slots in the band switch shields. Also
make sure the tab on the bottom oi the
shield enters its corresponding circuit
board hole.

2. Push the shield down tight against the
circuit board and solder the bottom tab
to the foil. NOTE: Be careful not to pinch
any wires between the shield and the cir-
cuit board.

3. Solder the top tabs on the PA shield to
the notches in the band switch shields.

BAND SWITCH
SHIELD

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Refer to Pictorial 4-1 (illustration Booklet. Page 33]
for the location of the following test points.

NOTE: Willi the BAND switch

in any position other

than the one indicated to the step, the resistance
should measure approximately 1000 0 higher than

shown. It you do not have the

accessory hands (30-.

17-. 12-. or 10~mater5) installed. omit the tests

marked with an asterisk.

mixer filter (L101 -- L117)

BAND TEST POINT OH'MMETER READING POSSIBLE CAUSE
( l 80 R107 350 to 700 A. Q-volt line [U402).
( J 40 R109 350 to 700 B. Bandsw-itch wiring.
( ] 30 R1 11 350 to 700 C. Short in corresponding
[ ] 20 R113 350 to 700 D. P101 wiring.
( ) 17* R115 35010700
I ) 15 R117 35010700
[ ) 12" R119 350 to 700
( ) 10' R121 350m 700

make the following tests.
TEST POINT

Point E (wire socket).

Unplug P101.

Point E (wire socket).

12 V pin [plug P101).

Return the BAND switch to 80 before you

OHMMETER READING POSSIBLE CAUSE
300 to 700 A, 9-Voll line.
E. Main tuning capacitor C1.
C. P101 wiring.
300 to 700 A. VFO CiJ'Cuit, L118.
Q102-Q106.
300 to 600 A. 12~volt line.

B. BFO circuit. Q1021
C. Mixer output. Q1011

D. HFO output, Q111.

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(

Page 79

VFO ALIGNMENT

] Refer to Pictorial 5-2 [Illustration Booklet.
Page 34) and use the blade of the shorter align-
ment tool to turn the trimmer of main tuning
capacitor (C1) clockwise until it is just snug.
Then turn the trimmer counterclockwise one
full turn.

l Position all wires in the area of the VFO circuit
away from coil L116 and the VFO tuning
capacitor.

] Connect your frequency counter to test point
TP102.

NOTE: The coil that you will adjust in the next step
has been preset close to its correct setting at the tac-
toryr When you adjust this coil, be sure the slug re-
mains in the lower half of the Coil.

l

} Set Lhe Transceiver TUNING DIAL at the 250
mark and adjust L118 for a reading of 5.7493
M'Hz.

) Turn the dial to the zero mark and adjust the
trimmer of tuning capacitor {C1} for a reading
of 5.9993 M'Hz.

] Repeat the previous two steps until your fre-
quency counter indimtes exactly 5.7493 MHz
with the dial at 250. and 5.9993 MHz at zero.
Then disconnect your frequency counter.

TRANSMTT RETURN ADJUSTMENT

l

1

Sat your V'I'VM or DVM to a 15 volt range and
connect its positive (+] test lead to the lead
of 33 k0 resistor R127 nearest TRANSMIT RE-
TURN control R131.

Make sure the CW LEVEL control [on the front
panel) is fully counterclockwise. and the RJT
Control is in the detent at the center of rotation.
Then note the voltage indication on your
meter.

Key the transmitter by shorting the KEY input
on the rear panel. or by holding down a regular
key connected to the KEY input.

Adjust TRANSMIT RETURN control R131
until the transmit voltage equals the voltage
you observed in the receive mode. Then dis-
connect your meter.

This completes the VFO alignment and Transmit Re-
turn adjustment, Proceed to "BFO Alignment."

BFO ALIGNMENT

Refer to Pictorial 5-3 [Illustration Booklet. Page 35]
for the location of the test point and adjustment used
in Lhe BFO alignment.

) Connect your frequency counter to TP104 on
the upper right~hand side ofthe BFO shield.

) insert your alignment tool through the L135
access hole in the top of Lhe BFO shield and
into the core of L135.

(

l

Key the transmitter and adjust L135 for a fre-
quency counter indication of 8.8307 MHz,

Unkey the transmitter and the frequency indi-
cation should be about 8.8314 MHz. Discon»
nect the frequency counter from TP104 and
remove the alignment tool.

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INSTALLATION AND OPERATION

This section of the Manual first describes the con»
necttons on the rear panel of your Transceiver and
then describes the operation of the front panel conA
trols, If you install and operate your unit as dew
scribed, you Will achieve the greatest satisfaction
from your Transceiver.

REAR PANEL CONNECTIONS

Heathkiti

Refer to Pictorial 7-1 [illustration Booklet. Page 36)
for the locations of the following rear panel connec-
tions.

GROUND

This binding post is provided so you can ground
your Transceiver. Use #18 (or heavier) wire and con-
nect it securely to a grounded water pipe or other
earth ground. if you use a water pipe. he sure there
are no plastic pipes or connectors between the
Transceiver and the earth.

ANTENNA

This Transceiver will provide satisfactory results
with almost any dipole or inverted vee antenna that
has a 50- to 75-ohrn impedance and a low VSWR.
Such antennas are easy to construct from lightweight
hookup wire. and they are inexpensive. However,
antennas of the beam or quad type will provide a
significant improvement in performance. An effi-
cient antenna will produce more reliable and enjoy-
able contacts.

METER ZERO

This control is accessible through a hole in the rear
panel and allows you to set the S-meter pointer to
zero when no signal is being received.

MUTE DELAY

This control is accessible through a hole in the rear
panel and allows you to set the delay between the
time you release the CW key and the receiver un-
mutes.

SIDETONE LEVEL

This control is accessible through a hole in the rear
panel and allows you to set the side tone to the de-
sired level,

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Page B7

Comprehensive reference material about antennas
and transmission lines is presented in the ARRL An-
tenna Handbook and similar publications, available
at most electronic hobby stores or public libraries.

Once you have selected and installed your antenna.
connect its lead-in to the coaxial jack on the rear
panel.

DC POWER

Your Transceiver is designed to operate from a 12.6-
volt DC source such as the Heathkit Model PSA-Q
Accessory Power Supply. an automobile battery, or
other stable source that will supply 12.6 volts at 1
ampere. it you have the Model PSA-E) Power Supply
its output connector will plug directly into Lhe DC
POWER connector on the rear panel of your Trans-
ceiver.

For connection to a car battery or other 12.6-volt
source. refer to Detail 71A and perform the follow-
ing steps,

( ] Locate the 2-pin plug shell and two female
connector pins that were supplied with your
Transceiver kit, 'l'hen cut the ears from the
connector shell as shown.

[ ) Prepare a red wire and a black wire (preferably
16 gauge), long enough to reach from the
Transceiver to your power source. Remove
1/4" of insulation from one end of each wire
and install a female connector pin on the end
of each as shown in the Detail.

[ ) Position the 2-pin plug shell with its point as
Shown: then insert the pin on the end of the
black wire into the hole at the pointed end,
The pin is properly seated when it snaps into
the shell.

[ ] Similarly. insert the pin of the red wire into
the other hole.

( ] Twist the wires to form a 2'conductor cable.
Then remove sufficient insulation from the
end of each wire to attach whatever battery
connectors you will use. or to connect the
wires directly to your source terminals.

0 7 V, )A t (INCHKSX '2 3
l"tmt""." .l t.. i . L t
r l t i l r t I

l
O " 'tCUj) 3 : s o r 5

TO POSITJVE

\ (-l
\ BATTERY
TERMINAL

TO NEGATtvE (-)
annenv TERMtNAL
RED

BEND OVER
AND SOLDER

Detail 7-1A

( ) Connect the black wire to the negative (-t
source and the red wire to the positive (+)
source.

CAUTION: Before you connect your power source
to the Transceiver. recheck the connections to be
sure the negative [7 ] source connects to the pointed
end of the connector and the positive (+] source
to the flat end. Reversed polarity will damage the
Transistors in your Transceiver.

( ) Plug the connector into the DC POWER con»
nector on the rear of your Transceiver.

NOTE: lf you use your Transceiver in a boat or car.
keep the power supply leads as short as possible
to help reduce ignition noises. You may need to in-
stall a hash filter" if the interference is severe. The
ARRL Handbook contains valuable information on
noise filtering.

SPEAKER

For loudspeaker listening. connect a 4. to 8-oltm
speaker to the SPEAKER socket on the rear panel.

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Mixer Filter Problems

No Signal ouxpur 31 INJIOUT.

Shoned cable in INJ/OUT.

2. 0101 .

3, D1011hroughDH7,
No signal. one band. 1. Improper alignmanl.

2 Dalecllve final.

3. Solder bridge on wit

4. Blade In datecfiva band.

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AUDIO CIRCUITS

After being filtered at the output of product detector
U303. the audio signal is coupled to the inverting
input (pin 6) of operational amplifier U304B. This
stage makes up a lovaass filter with an approximate
cutoff frequency of 1 kHz at the 6 d8 point. The
amplified audio signal at pin 7 of U304B is coupled
through C347 to Selectivity switch SW3. and then
through R352 and 033910 the input (pin 2 of U304A]
of the audio-active filter.

In addition to U304A. U3D4C makes up the audio-
active filter. These operational amplifier sections are
cascaded and allow a certain amount of audio fre-
quencies to pass through. The bandwidth for this
filter is 300 Hz (between the BdB points) at a center
frequency of 700 Hz. This filter provides sharp selec~
tivity and permits excellent rejection of unwanted.
adjacent audio signals in the receive mode. The out-
put of the audio-active filter is coupled through
C346 to Selectivity switch SW3. The setting of this
switch determines which signal is applied to AF
Gain control R3.

The audio signal from the wiper arm of AF Gain
control R3 is coupled through R369 to the input [pin
8) of audio power amplifier U306. A signal is
coupled from the output (pin 8) of sidetone osoil-
lator U304D to this input. In the transmit mode,
Q3011 mutes this input by connecting it to ground.
The output signal from U306 is coupled through
C359 to speaker 13 or phone jack $2.

KEYING CIRCUIT

Q407 through Q409 provide timing and switching
of the receive and transmit functions in the Trans-
ceiver.

The keying circuit is made up of Q4DB (+T transmit
request] and Q409 [ + R receive request]. The outputs
of these transistors are activated when the CW key
is depressed Q41] and Q412 in the receiver mute
delay circuit are activated in the same manner.

When the key is depressed, the base of Q408 goes
low. This causes it to conduct, thus establishing a

+12 volt output for the "+T" request lines. At Lhe
same time (1407 conducts and turns off C2409. C574
through C577 provide the proper timing of these
lines as they are turned on and off.

RECEIVER MU'I'ING

Q41] and Q412 provide a variable delay for the re-
ceiver muting circuit. The emitter of Q41] is con-
nected to ground when the key is being depressed.
This effectively puts the collector of Q4l1 at ground
potential, causing mute drive transistor Q4121 to con-
duct and provide +12 volts. The muting of the re-
ceive line ceases when the base voltage of Q412
reaches the + 8 Voltage. R445 and C578 provide an
adiustable time constant for the muting circuit.

SIDE TONE

When the key is depressed. pin 9 of sidetone oscil-
lator U304D goes high and the oscillator is activated.
The 700 Hz signal at the output [pin 8) of U304D
is coupled through C351 and applied across
Sidetone Level control R368. From the wiper of
R368. the sidetone is coupled to the input [pin 8]
of audio amplifier U306.

RELATIVE POWER

In the transmit mode. C568 couples a portion of the
RF voltage across voltage divider R428 and R429.
D408 rectifies the positive half cycle of the voltage
across R429. 0569 filters this positive voltage. which
is coupled to meter M1 through current-limiting re-
sistors R331 and R431.

S-ME'I'ER

In the receive mode. D305 conducts When the AGC
voltage across C317 exceeds a predetermined level.
A portion of this voltage is coupled through R314
to the gate of Q1302. The resulting. ramped voltage
at the source of Q302 is coupled to meter M1 through
current-limiting resistor R331. A regulated +9 volt
supply powers the meter circuit. Meter zero control
R333 allows you to set the meter to zero.