Heath Heathkit SBM-104-2 Guide
F
MODIFICATION KIT
Evert
66
R.
Culpeppur
Newport
G*
News,
Ave.
Va
23608
SB-104 SINGLE SIDE BAND TRANSCEIVER
MODEL
SBM-104-2
The purpose of the Modification Kit is to update your
SB-104 Transceiver to reflect all the latest Heathkit
engineering improvements. When the changes are
completed, your Transceiver will be identical to the
-Heathkit SB-104A Transceiver.
-
b
*.*
-%*
~hehkeach part against th; follotving list. Any part
that is packed in an individual envelope with the part
on
number
.A
after you identify it until it is called for in a step. The
.
-
*
c
it should be placed back in the envelope
ers correspond to the numbers on the Parts
F
KEY
No.
-
HEATH
part
No.
QTY.
DESCRIPTION CIRCUIT
cs-
PARTS
"
3
Comp. No.
LIST
To order a replacement part, always include the
PART NUMBER. Use a Parts Order Form, or, if one is
not available, refer to "Replacement Parts" inside the
rear cover of your Transceiver Manual. For prices,
refer to the separate "Heath Parts Price List."
NOTE: The circuit component numbers refer to the
component numbers in the
.
Schematic.
-
SB-104A Manual and
2
A1
.1*!2
*,\
.
wing resistomhave a tolerance of
btherwise.
50h
\
is
10%
is
indicated by a fourth color
indicated by a fourth color band of gold.
4
100
(brown-black-brown)
a,
5
%
1 180
brown)
1
390
1
1000
1
3300
3 5600
1
6800 0,So/,
1
12 k0 (brown-red-orange)
1
22 k0 (red-red-orange)
(brown-gray-
(orange-wh~te-brown)
a
(brown-black-red)
0
(orange-orange-red)
SL
(green-blue-red)
(blue-gray-red)
BENTON HARBOR, MICHIGAN
...
10%
unless
R343,
W,
R619, R621
R13
RS14
R684
R321
R612, R677,
R679
R322
R329
R625
HEATH
COMPANY
..-
49022
/dl
Page
2
KEY
HEATH QTY. DESCRIPTION CIRCUIT'
No. Part No.
-
I
-
22
n
(red-red-black) R22
n
(yellow-videt-black) R23, R1237
47
n
(brown-black-brown) R1253
100
n
(brown-green-brown) R21, R1206
150
470 (yellow-videt-brown) R1203
n,
5% (videtgreen- R254
750
brown)
1200 (brown-red-red) R1201
n
(orangeorange-red) R1231
3300
15 kn (browngreen-orange) R407, R507
22 kn (red-red-orange) R1251,
33 kn (orangeorange R209
orange)
kn (brown-black-yellow) R568
100
180 kn (brown-gray-yellow) R566, R567
330 kn (orangeorange R564
yellow)
MR.
(browngreengreen) R207
1.5
.. ,.
Comp. No.
R1254
R1252
KEY
HEATH QTY. DESCRIPTION
No. Part No.
-
Mlca
(cont'd.)
81 20-106 1
B1 20-116 1
B1 20-128 2 470
-
390
so0
Ceramic
~w=---~.--a~
CIRCUIT
Cornp. No.
pF
PF
pF
I
I
Other Resistors
CAPACI'I'ORS
Mica
6110 n,I%, 118-watt
n,
1210
15
green-black)
470
violet-brown)
.15 n,
green-silver-gold)
.82
red-silver-gold)
220
brown)
2000
1% 118-watt
n,
I-watt (brown-
n.
1-watt (yellow-
5%,
2-watt (brown-
n,
5%
2-watt (gray-
a,
2-watt (red-red
fl
control
Page
3
KEY HEATH QTY. DESCRIPTION KEY HEATH QTY. DESCRIPTION CIRCUIT
No. Part No. Comp. No. INo. Part No.
Other Capacitors
83
27-47 9
.I
pF
Mylar*
pF
vertical electrolytic
5
pF
tantalum
22
47
pF
tantalum
10
pF
electolytic
pF
electrolytic
500
1000
pF
electrolytic
3.2-18
pF
trimmer
(blue dot)
pF
5-25
15-60
trimmer (red dot)
pF
trimmer
COIL-INDUCTORS CHOKE
pH
C1 40-1713 2 .82
C2 40-1865 1
C2 40-1869 2 1.31
C2
40-1872 1 2.3
C2 40-1877 1 13.25
C3
45-82 1 350
peaking coil
.44
pH
(white and green
dots) toroid
pH
(green dot) toroid
pH
(green dot) toroid
pH
dots) toroid
pH
choke
(.white and yellow
cRculT
-
MISCELLANEOUS
85-1 930-1 1 VFOlfilter circuit board
181 -2203 1 Assembled receiver front
El 206-1265 1 ALClfiRer board shield
E2 258-95 1 Spring clip
343-15
344-52
344-58
344-96 1' Blue stranded wire
E3 350-12 1 Cement (tube)
E4 391-34 1 Blue and white
E5 431-49 1 1 1-lug terminal strip
E6 475-10 3 Small ferrite bead
E7 475-12
490- 185 6 Soder W~ck"
595-1992 1 SB-104A Assembly Manual
595-1994 1 SB-104A Operation Manual
**Registered Trademark -Solder Removal Co.
end circuit board (G)
6"
Shielded cable
8"
Red wire
4' Gray wire
label
4 Large ferrite bead
SBM-104-2 Modification
Manual (see Page 1 for
Part Number.)
Solder
Comp. No.
DIODES -TRANSISTORS
IN458 diode
IN191 diode
1 N4149 diode
GD510 diode
1 N3017 Zener
MPS6520 transistor
2N5089 transistor
2N5770 transistor
40673 transistor
*DuPont Registered Trademark
ARE STAMPED
ON
MOST DIODES.
Page
4
p S L = . - - * = . - 5 + 9 J
MODIFICATION PROCEDURE
This modification kit contains all of the current mod-
ifications for your SB-104 transceiver.
To make a modification, check each component in the
following step-by-step assembly with the component
installed in your kit. If the component in your kit is
different from the one in this Manual, remove it from
your kit and install the new one at the location shown.
If
the component shown in the Manual is the same as
the one installed in your kit, disregard it and proceed
to the next step. Be careful when you remove a com-
ponent from a circuit board, or damage to the circuit
foil will occur.
When you make a chassis connection, the indicated
number of wires at the connection are shown in the
solder instructions. For example, when you connect a
wire to a solder lug where two wires are already
connected, the solder instructions will read
may be necessary to remove any excess solder from a
connection to make room for the new wire or component lead. Make sure you apply enough heat to the
connection so that solder flows to each wire or component lead.
Do not make any connections, or install any components or circuit boards, until you are instructed to do
so in a step.
When assembly or disassembly is required in a step,
refer to your
proper procedure.
SB-104A Assembly Manual for the
(S-3). It
Perform the following steps to remove the VFO from your unit:
1. Remove the main tuning
2.
Remove the front jackson
drive from the VFO.
3.
Remove the four
hardware aside.
6-32 x 318"
VFO OSCILLATOR CIRCUIT BOARD
esistor installed at R1206, leave it
BANDED END
Detail
1-1A
i
1
1
of the diode in circuit board
E
if a transistor was previ-
hole
INSULATION
PICTORIAL
around both
1-1
Page
6
(
( )
Position the VFO BUFFER cir-
I
cuit board as shown.
(/)
R1231: 3300 (orange-orange-
red).
NOTE: When you install ceramic
capacitors, do not push the insulated
portion of the leads into the circuit
board holes. This could make it dif-
ficult to solder the leads to the foil.
VFO BUFFER CIRCUIT BOARD
I
I
@%
b=*==-*=*-aii
:
47 0 (yellow-violet-
)
C1233: 400 pF mica.
)
Solder the leads to the foil and
cut off the excess lead lengths.
PICTORIAL
1-2
(
/r
()/J
Remove the two wire sockets from the foil side
of the oscillator circuit board (#85-1205). Clean
the solder from both of these holes.
(4
Remove the 5/16'' bare wires from the foil side of
the buffer circuit board (#85-1206). Clean the
solder from both of these holes.
(/r
Position the oscillator and buffer circuit boards
as shown.
NOTE: In the following step, you will prepare a wire.
To prepare a wire, cut it to the indicated length and
remove
(
4
-
(J)
114" of insulation from each end.
Prepare a 5" red wire.
Connect one end of the 5" red wire to the oscil-
lator circuit board hole +11. Solder the wire to
the foil.
Refer to your SB-lO4A Assembly Manual, Page
1-29, and reassemble the VFO. Do not install the
VFO shield at this time.
Refer to Pictorial 1-4 for the following steps.
(
i/j
Cut a 314" red wire and remove all of the insulation.
(4
Install the 314" bare wire between the INPUT
hole on the buffer circuit board and the OUTPUT hole on the oscillator circuit board. Solder
both
of these connections to the foil and remove
the excess wire lengths from the component
side of the circuit boards. Route the 5" red wire
J
as
(
)
Refer to your SB-104A Assembly Manual, Page
1-30, and install the VFO shield as shown.
Refer to your SB-104A Assembly Manual and
(4'
reinstall the VFO in your unit.
Connect the other end
buffer circuit board hole
the foil. dio/Reg Circuit Board."
Refer to Detail 1-3A and press the top edges of
ceramic capacitors C1202, C1203, C1204, and
C1216 together.
Remove the cap from the tube of cement
(#350-12) and, using a suitable small pointed
tool, punch a hole in the end of the tube nozzle.
CAUTION: This cement is very soft and sticky;
handle it with care.
Squeeze a sufficient amount of cement on t
top edges of the two groups of disc capacitors to
cement the capacitors together. Take care not to
move these capacitors during the following
steps as it will require several hours for the
cement to set.
of
the 5"yed wire to the
E.
Solder the wire to modifications. Proceed to the "Transmitter Au-
This completes the "VFO Oscillator Circuit Board"
5"
RED WIRE
@
-
PICTORIAL
1-4
Page
8
TRANSMITTER AUDIO /REG CIRCUIT BOARD
ing tantalum electrolytic capacitor,
be sure to position the plus
marked or dot
(+)
plus
(0)
marked
marked hole.
lead
(+)
in the
ircuit board-in the
PICTORIAL
2-1
LG
b=*==-=*=*'%j
)
Remove the transmitter
(
cuit board (C) from the unit and
position it as shown. Then per-
form the following steps.
[
d~ormthe leads of a 390
watt (orange-white-brown) re-
sistor as shown. Then cut each
lead of a 39 pF capacitor to 112"
and wrap the capacitor leads
around the resistor leads. Solder
the leads together as shown.
/CUT\
(4
R314: C373: 390 a139 pF
resistor-capacitor assembly.
/
[A
4303: 2N5089 transistor
IF
n.
cir-
114-
TRANSMITTER IF CIRCUIT BOARD
Page
9
/
(
/j
R329: 12 kn. 114-watt (brown-
red-orange).
(/J
C322: Remove and discard.
C369: 390 pF mica.
R321: 3300 (orange-orangered).
(
R322: 6800 n, 5%. 114-watt
(blue-gray-red).
(
i'
4302: 2N5089 transistor
(#417-244).
BFLAT
/
I
1
(/)
C361: 15 pF mica.
/
t
(
Jcye: 15 p~ mica.
FLAT
older the leads to the foil and
cut off the excess lead lengths.
TOP EDGE
0
F
SPRING
Page
11
Refer to Pictorial
3-3
for the following step.
lder the spring clip to the shield in the area
wn.
(This clip will ground the shield di-
rectly to the compartment shield when the cir-
cuit board is installed.)
PICTORIAL
3-3
Page
12
giiJ-dj
Refer to Pictorial
ing steps.
the 470 pF mica capacitor, and
the 6 pF ceramic capacitor.
the 15-60 pF trimmer capacitor.
(dut a 112" length of brown wire
and removeall of the insulation.
(Mblder
wireat the indicated location on
the 15-60 pF trimmer capacitor.
SOLDER
34A
for the follow-
CUT
OFF
one end of the 112" bare
BARE
W lRE
I
I
PICTORIAL
3-4A
dl1nja.re3 .xo)pede3 ~aurur!q
.z/r
aql urxoj
se aqm axeq
11n:,tr1:,
atrvoa
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