McMartin TR-66A Manual

www.SteamPoweredRadio.Com
1-fCMartin industries. inc.
• I
I
i
INSTALLATlCN AND SERVICE MANUAL
TR-66A
SCA TRANSISTORIZED
MULTIPLEX RECEIVER

www.SteamPoweredRadio.Com
TABLE OF CONTENTS
UNPACK ING . . . . . • . . . . . . • . . . . . • 1
WARRA.NT'l .••
SPECIFICATIONS •
SPECIAL FEATURES .
. . . .. 1
• • • 2
• • 4
GENERAL DESCRIPTION ...•.........• S
INSTALLATION PROCEDURE .......•..•.• 6
FIELD ADJUSTMENTS
TROUBLESHOOTING ..
• • • 7
TRANSISTOR AND DIODE COMPLEMENT.
SCHEMATICS
• 11
. .12
il !C E: ~n ~ EIEI• CJ x,uu
il'llk PIH; 1$ OJ f l~ ~.
=~~ =~ :..:.: Ul =U="= ~U~LA_ll-:-u t. _S -===
McMcinin i~1U<Fid, inc.
omaha.. ncnrusku

www.SteamPoweredRadio.Com
UNPACKING
Remove
the
receiver
from
the
carton
and
examine
it
for
signs
of
external
physical
damage.
Remove
the
top
cover
by
loosening
the
four
screws
at
the
sides.
Examine
transistors,
crystal
and
etc.,
to
see
that
they
are
properly
seated
in
their
sockets.
If
any damage
is
noticed,
ilIDllediately
notify
the
shipping
agency
and
advise
McMartin
Industries,
Inc.
of
such
action.
Contents
of
Carton:
l McMartin
Multiplex
Receiver
l
Instruction
Manual
l Cover Nut
(for
MN-MX
Switch)
WARRANTY'
McMARTIN
Broadcast
and Audio
Products
are
warranted
to
be
free
from
defects
in
workmanship
FOREVER.
At
our
discretion,
we
will
exchange
or
repair
any
defective
unit
or
components,
at
any
time,
without
charge.
Material
and components
are
guaranteed
for
a
period
of
ninety
days
from
the
date
of
original
purchase
.
Return
authorization
should
be
obtained
and
transportation
char~es
must
be
prepaid
on
equipment
returned
for
warranty
service.
This
warranty
does
not
extend
to
any•of
our
products
which
have
been
subjected
to
misuse,
neglect,
accidents,
incorrect
wiring
not
our
own,
improper
installation,
or
to
uni
ts
that
have
been
used
in
violation
of
the
instructions
furnished
by
us;
nor
to
units
that
have
been
altered
outside
our
factory.
- 1 -

www.SteamPoweredRadio.Com
'
i ..
Main Channel
Range
Sensitivity
Selectivity
Capture Ratio
RF Input Antenna
Distortion
Subchannel
Range
Sensitivity
Selectivity
De-emphasis
Cross Talk
Frequency response
Distortion
Hum and noise
General
Outputs
SPEC;[FICATIONS
88-108 mHz, crystal controlled ·
1
microvolt for 30 db of quieting, complete
limiting at 3 microvolts
Fixed 250 kHz at 3 db points, 553 kHz at 50 db
points
Better than 1.25 db
50-72 ohms (solderless coax connector)
Less than 0.5% at 1007. modulation (400 Hz)
41, 42, 65 or 67 kHz at+ 6 kHz deviation -
other frequencies special order. (Must specify
frequency when ordering.)
(20% Inj.)
(10'1.. Inj .)
5 microvolt/45 db quieting
5 microvolt/30 db quieting
~ 7.5 kHz at 3 db points
150 microsecond standard, 75 microsecond on
special request
Main to SCA
SCA to SCA
Stereo to SCA
-55 db
-55 db
-55 db
30-8,000 Hz~ 2 db at 150 microsecond de-emphasis
Less than 1.07. + 6 kHz Dev., 400 Hz.
G~•ater . than 60 db below full output
Main and sub-channel switched l.OV at 600 ohms
unbalanced (phone jack). Optional: Balanced
25 and 70.7 volt (terminal board) with LT-lOA
or LT-20 plug-in amp.
- 2-

www.SteamPoweredRadio.Com
Front
Panel
Controls
Rear
Chassis
Under
Chassis
Power
Supply
Dimensions
and
finish
Shipping
weight
Pilot
Light
Lamp
SPECIFICATIONS
(continued)
Main/sub-selector
switch,
volume
control,
power
ON-OFF
AC
convenience
outlet
(unswitched)
Antenna
connector
Antenna
B+
switch
Fuse
holder
Mike preamp
input
(4
pin
Jones
plug)
Adjustable
automatic
main
channel
muting
105-120V
AC
50/60
Hz
fused
at
0.5
amp;
normally
5
watts,
with
LT-lOA -
15
watts,
with
LT-20 -
22
watts.
11"
wide
x 4
1/2"
high
x 8
3/4"
overall
depth,
gray
cover
and
brushed
chassis
7
lbs.
Neon
assembly
-3-

www.SteamPoweredRadio.Com
SPECIAL
FEATURES
*
The
elimination
of
tunable
IF
transformers.
The
IF
transformers
have
been
replac~
by a
single
10.7
mHz
solid
state
filter.
The
bandwidth
remains
constant
at
all
signal
levels
and
is
phase
linear
over
220 kHz.
*
All
transistors
operate
at
less
than
501.
of
their
rated
dissipation
for
increased
long
life
through
cool
operation.
* The
sub-carrier
uses
a
phase
linear
bandpass
filter
with
steep
sided
skirts
for
rejection
of
stereo
and
second
sub-carrier.
*
Noise
rejection
is
excellent
due
to
the
elimination
of
time
constants
in
the
limiters.
*
A
pulse
counting
detector
is
used
eliminating
drift
and
the
necessity
for
tuning.
Near
perfect
linearity
is
also
obtained.
*
Convenient
test
points
for
easy
aligmnent
of
the
RF
section.
*
Integrated
circuitry
is
used
in
both
the
main
channel
and
sub-channel
limiter
amplifiers.
*
RF
shielding
meets
FCC
requirements.
*
Unit
is
supplied
with
an
RF
solderless
connector,
both
male
and
female
for
72
ohm
coax.
*
There
is
a
front
panel
switch
for
MN
(main)
and
MX
(sub-channel).
This
switch
simplifies
servicing
and
enables
a
customer
to
switch
to
the
main
channel
for
special
announcements,
such
as
historical
events
or
local
distress
notices.
A
cover
nut
is
supplied
with
all
units
and
can
replace
the
knob
if
it
is
desired
that
the
customer
be
prevented
from
using
the
switch.
*
1"'10
plug-in
amplifiers
are
available:
LT-lOA,
5-watt
amplifier;
LT-20,
12-watt
amplifier.
A
socket
is
provided
for
these
plug-in
amplifiers
and
all
wiring
is
·
rincorporated
1n
the
receiver.
The
25
and
70.7
volt
outputs
are
available
on a
terminal
strip
on
the
rear
of
the
chassis.
* A
plug-in
mike preamp
is
also
available
for
connecting
a mike
to
either
the
tuner
or
tuner-amplifier
combination.
This
preamp
employs
solid
state
switching
to
mute
music
when a
push-to-talk
mike
is
used.
- 4 -

www.SteamPoweredRadio.Com
GENERAL DESCRIPTION
The TR-66A multiplex receiver is desi g ned for continuous duty r_ eception
of commercial FM/SCA multiplex programming.
The TR-ooA is built on a modular construction basis utilizing five glass
epoxy printed circuit boards .. These consist of an RF amplifier, IF amplifier
and demodulator, subchannel demodulator, dual gate squelch and audio
amplifier, and power su pply.
The RF amplifier board uses two silicon field effect transistors (FET's)
in a cascade configuration for excellent AGC with minimum cross-modulation
The local oscillator is crystal controlled .• k~silicon bipolar transistor
is used for a mixer which is suitable for driving the low impedance solid
state 10.7 mHz filter. A 10.7 mHz IF trap is used in the mixer input to
improve the conversion gain.
The main channel IF board consists of two high gain, wide band integrated
circuits (IC's), an AGC and squelch circuit, pulse counting demodulator
and an audio amplifier.
The subchannel demodulator uses 1 integrated circuit (IC) for an amplifier
and limiter, a pulse counting detector, a squelch voltage amplifier and a
one stage audio amplifier. ·
The
dual gate squelch board and audio amplifier consists of a main and
subchannel gate which requires both main and subchannel squelch voltage for
operation. Positive squelch will occur in case of main channel failure.
The audio amplifier has an unbalanced low impedance output.
Two plug-in audio modules are available to transform the TR-66A into a
tuner-amplifier combination. A mike preamp is also available for the
TR-66A.
The power
supply board has a regulated 13V output for operating the receiver
and the optional plug-in mike preamp, and an unregulated 36V output to operate
either of the two optional plug-in power amplifiers.
Straight line design with test points make the TR-66A a very easy unit to
- align. There are no tuned circuits past the RF section. With no LC tuned
circuits in the IF, the problem ot drift need not be considered.
The main channel is crystal controlled to receive an FM frequency between
88 and 108 rnHz. An extremely well regulated power supply, utilizing
electronic control, assures circuit stability. The subcarrier is fixed
at+ 6 kHz deviation and may be ordered on 41, 42, 65 or 67 kHz. Other
subcarrier frequencies are available upon special request. The frequency
must be specified when ordering.
-5-

www.SteamPoweredRadio.Com
INSTALLATION PROCEDURE
Inspection
Upon receipt of your TR-66A remove it from the packing material and
inspect carefully for any damage caused in transit due to rough handling
or vibration. If damage is found, notify the shipping agency and advise
McMartin Industries, Inc. of such action.
Receiver Location
Sufficient space should be allowed for proper circulation of air to aid
in the cooling of the unit. Keyhole slots are provided in all bottom
plates to facilitate mounting the receiver on a wall. This is important
in order to increase air circulation and also to prevent use of the
recaiver as a "shelf" for paper, books, etc. It will also eliminate the
possibility of your customer moving the receiver and shorting or breaking
connecting wires. The receiver should be located as near to the entrance
of the antenna coaxial cable as possible.
Antenna
A properly selected and installed antenna is one of the most important
factors for satisfactory multiplex reception. Good directional char-
ac . teristics are very important in the reduction of "multipath" (cross talk)
reception and only proper antenna installation can eliminate this. This
condition is most c011111on in large metropolitan areas and mountainous
country. High gain antennas normally have the best directional pattern
and although signal strengcb may be high at a given location, it may still
be necessary to use this type to eliminate multipath. The antenna should
be o~iented for a combination of best signal and lowest multipath.
For all installations we recormnend the use of either a McMartin outside
(A-·72-SF) 3 or S element, 72 ohm, cut-to-frequency directional antenna or
indoor (A-72PA) transistor, fixed-frequency antenna. For proper location
and orientation of the antenna ., we recommend using the McMartin TX-200
Field Strength Meter.
Antenna Connection
An RF coaxial receptacle is provided on the rear of the chassis for the
re.commended outside antenna. A solderless connector plug is furnished with
the receiver for connection to the cable. The coaxial lead-in eliminates
receiving ignition and other man-made noises by the antenna line.
The reconwne~ded input impedance is 72 ohms, however, a 50 ohm impedance
may be used with little mismatch. Additional antenna connector plugs
may be obtained from McMartin Industries by ordering part #173009.
- 6 -

www.SteamPoweredRadio.Com
FIELD
ADJUSTMENTS
A
considerable
aroount
of
time
has
been
spent
aligning
your
receiver
to
your
exact
center
frequency.
Normally,
the
only
field
alignment
that
should
be
necessary
is
to
peak
the
antenna
coil
to
match
the
receiver
to
your
antenna.
The
following
procedure
can
be
used
if
a
frequency
change
is
required
or
for
touch
up
alignment
under
field
conditions.
It
should
be
noted
that
it
is
very
easy
to
peak
the
RF
section
to
an
adjacent
station
so
extreme
care
should
be
taken
in
the
RF
alignment.
Local
Oscillator
and
RF
Alignment.
1.
Reroove
only
the
receiver
top
co
v
er.
CAUTION:
Do
not
remove
the
bottom
plate
in
high
RF
signal
areas.
2.
Connect
a
volt
ohmmeter
(20k
ohm/volt
VOM)
,
or
preferably
a
VTVM
to
test
point
11
AH
(TP-A)
and
ground.
(-3.0
VDC
scale).
3.
Turn
the
oscillator
sl
ug
counterclockwise
(out)
as
far
as
it
will
go.
4.
Insert
the
proper
crystal
into
the
crystal
socket.
Crystal
frequency=
Operate
Freque
ncy
-10o7
mHz
2
S.
Slowly
turn
the
oscillator
slug
clockwise
(in)
until
the
ne~ative
voltage
rises
abr~pt
ly
,
in
di
cating
oscillation.
Continue
clockwise
until
the
voltage
drops
1/10
to
2/10
of
a
volt
below
the
peak
to
insure
positive
starting.
T
his
voltage
should
be
at
lea
st
one
volt
de
~ith
a 20 k
chm/volt
VOM.
6.
~E
::
h
the
meter
on
TP-A,,
tun~
the
do
ubler
coil
fo
r a
sharp
d
ip.
Min
imum
meter
reading
with
a
rap
id
voltage
r
i=~
when
the
core
is
turned
right
or
left
indicat
es
proper
tuni~
g.
7.
Connect
an
antenna
to
the
TR-~
6~.
8.
Connect
a
VTVM
to
TP-C
or
TP-
B
1
-3
.,
0
VDC
scale)
(
see
::ote
) .
9.
Tune
the
mixer
coil
for
maximum
negative
voltage
readin
g.
If
two
peaks
are
noted
,
tune
tc
the
peak
producing
the
highest
voltage.
10.
With
a
VTVM
connected
to
TP-C
or
TP-B,
tune
the
RF
coi_
for
maximum
negative
voltage.
'
-7
-

www.SteamPoweredRadio.Com
FIELD
ADJUS'IMENTS
(Continued)
11.
With
a
VTVM
connected
to
TP-C
or
TP-B,
tune
the
doubler
coil
for
maximum
negative
voltage.
12.
With
the
VTVM
connected
to
TP-C
or
TP-B,
tune
the
antenna
coil
for
maximum
negative
voltage.
13.
Repeat
steps
8,
9,
10,
11,
and
12,
until
no
further
improvement
can
be
made.
NOTE:
Since
there
are
no
tuned
circuits
in
the
rest
of
the
'ra-66A
you
may
listen
for
quality
on
both
the
main
channel
and
the
SCA
multiplex
channel.
Test
point
"C"
should
be
used
in
areas
where
there
is
more
than
SO
microvolts
of
signal
available.
In
strong
signal
areas
the
signal
must
be
attenuated
during
alignment
to
minimize
the
AGC
action
of
the
front
end,
especially
in
a
metropolitan
area
with
a
strong
adjacent
or
alternate
channel.
If
the
TR-66A
is
installed
in
a
fringe
area,
and
no
voltage
is
present
at
test
point
"C",
test
point
"B"
should
be
used
for
alignment.
(In
very
weak
signal
areas
the
voltage
may
be
positive
and
the
receiver
should
be
tuned
for
minimum
positive
or
a
negative
going
voltage)
.
For
steps
5,
6,
8,
9,
10,
11,
and
12,
it
is
PREFERABLE
to
USE
a
VTVM.
This
completes
the
oscillator
and
RF
align~ent.
*
On
units
with
screw
driver
adjusted
oscillator
slug
-
steps
3
and
5
should
be
as
follows:
3.
Turn
the
oscillator
slug
clockwise
(in)
as
far
as
it
will
go
.
5.
Slowly
turn
the
oscillator
slug
counterclockwise
(out)
until
the
negative
voltage
rises
abruptly,
indicating
oscillation.
Continue
counterclockwise
until
the
voltage
drops
l/10
to
2/10
of
a
volt
below
the
·
p,eak.
~
This
voltage
should
be
at
least
-1.5
volts
DC
with
a
20
K
VO~.
De-Emphasis
The
TR-66A
subchannel
has
a
standard
de-emphasis
of
150
microseconds.
To
change
this
de-emphasis
to
75
microseconds,
change
capacitor
C-12 on
the
subchannel
demodulator
board
from
.001
mfd
to
.00075 mfd.
-8-

www.SteamPoweredRadio.Com
(continued)
Speaker
and
Output
Connections
1.
The
25
and
70. 7 vo1t
speaker
terminations
are
available
on
the
rear
of
the
chassis
through
the
use
of
either
of
the
plug-in
amplifiers
(LT-lOA, 5
watts;
LT-20,
12
watts).
To
change
the
plug-in
amplifier
to
8
ohm
output,
make
the
following
circuit
changes
on
the
octal
socket
on
the
m-66A
chassis:
a.
Remove
the
wire
from
Pin
No. 6
and
connect
to
Pin
No.
2.
b.
Place
a jumper from
Pin
No. 3
to
Pin
No.
4.
c.
Eight
ohms
is
now
present
across
the
70.7V
terminals.
2.
600
ohms
(unbalanced
output)
at
1.0
volt
is
available
through
the
phono
jack
on
the
rear
of
the
chassis.
a.
In
order
to
obtain
the
best
noise
figure
possible,
it
is
recommended
that
when
using
the
TR-66A
with
an
external
amplifier,
the
volume
control
on
the
TR-66A
be
set
at
maximum
and
all
adjustment
of
volume be made
with
the
amplifier.
Main
Channel
Automatic
Muting
1.
The
bottom
plate
must
be
removed
for
adjus
.
ting
the
main
channel
mute.
z.
The.
tuner
is
shipped
from
the
factory
with
the
mute
adjusted
for
approximately
5
microvolts.
3.
The main
channel
mute
control
is
located
on
the
mute
and
audio
printed
circuit
board
under
the
chassis
(blue
control).
4.
The main
channel
mute
should
be
adjusted
with
the
main
channel
off
the
air,
or
the
antenna
disconnected
from
the
receiver.
5.
Adjust
the
mute
control
·
toward
the
rear
of
the
chassis
until
the
noise
disappears,
then
1/8
of
a
turn
farther
to
insure
proper
muting.
B+
Switch
(Rear
Chassis)
There
is
a
B+
switch
above
the
antenna
terminal
to
provide
power
(+12VDC)
to
the
antenna
terminal.
Tnis
power
is
used
when
connecting
a McMartin
indoor
transistorized
antenna
(A-72-PA)
to
the
TR-66A. The
internal
.
connections
are
all
made. Simply
remove:
the
lock
plate
from·
the
B+
switch
and
turn
the
switch
on.
Reverse
the
lock
plate
and
install
it
back
on
the
tuner.
-9-

www.SteamPoweredRadio.Com
FIELD
ADJUSTMENTS
(continued)
CAUTION:
THE
RECEIVER
MUST
NOT
BE
CONNECTED
TO
AN
OUTSIDE
ANTENNA
IF
THE
ANTENNA
B+
SWITCH
IS
IN
THE
"ON" POSITION,
AS
THIS
WILL
SHORT
CIRCUIT
B+
DAMAGING
THE
POWER
SUPPLY
AND
WII.L
MAKE
THE
RECEIVER
COMPLETELY
INOPERATIVE.
THE
SWITCH
MUST
ALSO
BE
IN
THE
"OFF" POSITION
WHEN
CONNECTING
THE
1R-66A
TO
A
SIGNAL
GENER.ATOR
OR
ANY
TEST
EQUIPMENT
•
.
f(

www.SteamPoweredRadio.Com
TROUBLESHOOTING
The
first
step
in
troubleshooting
is
to
check
the
B+
voltages
to
the
RF
board,
10.7
mHz
IF
board,
sub-channel
demodulator
board,
the
dual
gate
squelch
and
audio
amplifier
board.
The
B+
.
voltage
to
these
boards
should
be
13
volts+
1
volt.
If
not,
check
for
a
B+
short
in
the
wiring
or
check
the
regulator
board
for
proper
voltage.
NOTE:
The
antenna
B+
switch
must
be
in
the
OFF
position
if
it
is
used
with
an
external
antenna
or
generator,as
this
will
short-circuit
the
B+
if
this
switch
is
in
the
ON
position.
Failure
of
Main
Channel
Output
1.
Check
the
audio
output
of
the
main
channel
board
for
an
audio
signal.
If
audio
is
not
present
at
the
main
channel
output
of
the
main
channel
board,
check
the
audio
at
the
multiplex
output.
If
no
audio
is
present,
check
the
following:
a.
Connect
an
oscilloscope
to
the
emitter
of
Q-4.
If
no
signal
is
present,
connect
the
scope
to
the
base
of
Q-4.
If
the
signal
is
present,
Q-4
is
defective.
b.
If
no
signal
is
present
at
the
base
of
Q-4,
connect
an
oscilloscope
to
the
collector
of
Q-3.
If
a
signal
is
present
at
this
point,
check
capacitor
C-28
for
an
open
or
short-circuit
condition.
c.
If
no
signal
is
present
at
the
collector
of
Q-3,
conn-
ect
an
oscilloscope
to
the
base
of
Q-3.
If
a
signal
is
present
at
the
base
of
Q-3,
Q-3
is
defective.
NOTE:
If
no
audio
is
present
at
the
base
of
Q-3,
it
is
recommended
that
the
unit
be
sent
back
for
repair
as
the
circuitry
preceding
this
requires
specialized
test
equipment
for
servicing.
Failure
of
Sub-Channel
Audic,,i
l.
Check
the
voltage
at
the
mute
terminal
on
the
sub-channel
demodulator
board.
This
voltage
should
be
at
least_±.6
VDC.
This
positive
voltage
is
necessary
to
urunute
the
audio
section
of
the
~~ceiver.
a.
If
no
voltage
is
present,
check
diode
D-1
and
D-2
on
the
sub-channel
demodulator
board.
b.
A
67
kHz
carrier
signal
must
be
present
on
the
collector
of
Q-1.
c.
If
a 67
kHz
carrier
is
not
present
at
the
collector
of
Q-1,
check
the
input
of
the
sub-channel
board
for
a
67
kHz
carrier.
-10 -

www.SteamPoweredRadio.Com
TROUBLESHOOTING
(continued)
d.
If
no 67
kHz
carrier
is
present
at
this
point,
the
problem
is
in
the
67
kHz
band
pass
filter
or in
the
main
channel
board.
2.
If
it
is
determined
that
the
mute
voltage
is
correct
and
there
is
still
no
audio
output,
check
the
following:
a.
Connect
an
oscilloscope
to
the
audio
output
terminal
of
the
sub-channel
demodulator
board
and
if
audio
is
present
at
this
terminal,
the
sub-channel
demodulator
board
is
working
correctly
and
the
trouble
is
following
this
demodulator
board.
b.
If
no
audio
is
present
at
the
audio
output
terminal,
then
connect
an
oscilloscope
to
Pin
No. 5
of
IC (CA-3011).
A
square
wave
of
approximately
4
volts
peak-to-peak
should
appear
at
this
point.
If
not,
check
the
IC
(CA-3011).
c.
If
a
square
wave
is
present
at
terminal
No.
5
of
IC,
then
connect
the
scope
to
the
base
terminal
of
Q-2.
A
sawtooth
signal
should
be
present
at
this
point.
If
not,
check
C-11
and
C-12
for
a
short-circuit.
d.
If
an
audio
signal
is
present
at
the
base
of
Q-3,
connect
the
oscilloscope
to
the
collector
of
Q-3.
This
should
be a
high
amplified
audio
signal
with
some
residual
RF.
If
not,
check
Q-3.
e.
If
an
.
audio
signal
is
present
at
the
collector
of
Q-3
but
does
not
a.ppea~_
at
the
·
audio
output
terminal,
check
capacitors
C-14, C-15,
C-16
for
an
open
or
short-
circuit.
Also
check
the
400
millihenry
filter
for
continuity.
3.
If
it
has
been
determined
that
the
audio
output
is
present
at
the
audio
output
terminal
of
the
sub-channel
demodulator
board,
check
to
see
if
the
audio
is
present
at
the
audio
input
terminal
of
the
audio
amplifier
board.
If
not,
check
continuity
through
the
function
switch
to
this
terminal.
-11 -

www.SteamPoweredRadio.Com
SYMBOL
Q-1
Q-2
Q-3
Q-4
D-1
IC-1
IC-2
Q-1
Q-2
Q-3
Q-4
D-1
D-2
D-3
D-4
D-5
D-6
D-7
D-8
D-9
Q-1
Q-2
Q-3
IC-1
D-1
D-3
Feb. - 70
TRANSISTOR
AND
DIODE
COMPLEMENT
PART
NO.
DESCRIPTION
FUNCTION
201062
201062
201022
201035
220005
230004
230004
201036
201050
201049
201049
220004
220004
220005
220005
220004
220004
220005
220005
220005
201049
201049
201049
230001
220004
220004
RF
TUNER
BOARD
(PART
NO.
012011)
2N-5246
RF
Amplifier)
2N-5246
RF
Amplifier)Cascode
SE-4001
Local
Oscillator
40243
Mixer
IN-3604
Doubler
10.
7
mHz
AMPLIFIER
AND
DEMODULATION
BOARD
(PART
NO.
012013)
CA-2018A
CA-3011
40245
SE-4010
SE-4002/SE-4001
SE-4002/SE-4001
IN-51
IN-51
IN-3604
IN-3604
IN-51
IN-51
IN-3604
IN-3604
IN-3604
• ,c
'-
Wide Band
Amplifier
Wide Band Amplifi
er
and
Limiter
IF
Amplifier
Pulse
Amplifier
Wide Band Audio
Amplifier
Emitter
Follower
Output
AGC
Voltage
Doubling Diodes
AGC
Voltage
Doubling Diodes
IF
Limiter
IF
Limiter
Squelch
Voltage
Doubling Di od
es
Squelch
Voltage
Doubli
ng
Di
odes
IF
Limiter
IF
Limiter
Demodulator
Switch
SUBCHANNEL
DEMODULATOR
BOARD
(PART
NO.
012016)
SE-4002
SE-4002
SE-4002
CA-3011
IN-51
L'i-51
-12 -
Isolation
Amplifier
Demodulation
Switch
Audio
Amplifier
Wide Band
Ampl
i
fier
Li
miter
Mute
Voltage
Doub
li
ng Recti f i
er
Demodulator
Switch

www.SteamPoweredRadio.Com
TRANSISTOR
AND
DIODE
COMPLEMENT
(continued)
SYMBOL
PART
NO.
DESCRIPTION
FUNCTION
DUAL
GATE
MUTE
AND
AUDIO
AMPLIFIER
(PART
NO.
012015)
Q-1
201049 SE-4002 Main Channel Switch
Q-2
201049 SE-4002 Sub-Channel Switch
Q-3
201019 40232 Mute Switch
Q-4
201049 SE-4002
or
SE-4001 Audio
Amplifier
Q-5
201049 SE-4002
or
SE-4001 Audio
Amplifier
POWER
SUPPLY
(PART
NO.
012014)
Q-1
201046 40310
Regulator
D-1
210008
R8D8
Rectifier
D-2
210008
R8D8
Rectifier
D-3
210008
R8D8
Rectifier
D-4
210008
R8D8
Rectifier
D-5
220007
13V
Zener
Reference
Diode
-
13
-

www.SteamPoweredRadio.Com
MAIN
CH
MUTE"
C7 +
UII -
$u/l
rRANSISrORS
Rl6
47K
QI, Q2, Q4, Q$- 2N3392 OR S£-4002
Q3-40232
* S£L£Crco IN PROOl/CrtCN
ANT.
S0-1'5J\
IOMM
RF(
. CH~
1 20 V&C
~HI~
~,-
AHO
... [II
O "-<lN
SW-I
-
1 0.7
C RYSTM.
l'll.T£11
A C
, .,
0. 5AW
Pl@
1 0.7MHI
1, AMP.
UIIIITO
...
...,T£
POW!!!
SUHI.Y
RE
-8-1372
ca
$ul
64k'
AUDIOIN-4':1
,-------~MIC
8+
12V.
sue CH . SU B
Fl~Tt!i:: t-,A;-:'!,ir!----"'I._
...
« sue
...,y
82K
I V
+
38V
10 . 7V.
-=
OU&l G&T£
+ C$
/60ul
12$V.
~}·-~
6411. /001<
/,ICM'am,o~ . JM.
OMAHA , NEBR .
NON£
-8-1372
MUTE AHO I--+----, AUOIO
AUOIO-, GAI N
IOK
AUOIO OU TPIJT

www.SteamPoweredRadio.Com
':"
':"
01,
02
a
O:S--MI
01.oiao:s-Sf:-~
':"
*
SELECTED
IN
Pfl00UCT10N.
Cl•
2-
0Z•
2"524'
0)•$[•4()01
04•40Z-U
o,--
MUTt:
..
&+
IZV.
..
4.71C
+
CIO
I
l60ut
-25~
119
1211
':"
"''
cu
l~
8-1373
"'2
12K
,,,,.....,.
.
.
.
.....
...
-..
OMANA,1C91.
Jlllll
.....................
---·
SCHOIAT'IC.P.<:._,,.,
·MA
H•CleMC•~l'tO
,
..

www.SteamPoweredRadio.Com
-:-
"'
.,
··~
,.
I
H:
~
_ca
~~
IO
.
<M
i··
...
Cl
RI
◄
1,t
,
,SO
~
Q
-=
-=
tt
..
'
1::.
-:-
AOC~
Ot
-
NOTES:
C
UHlUS
0l'HI!-
ll'[C,,~01
L
R[915TOfl9
l,Z"
tl01l
l:
rc[~lr&_~r~
~fvt
POURITY
SHOWN
.
• .
9011(
\lll.UCS
IIIIA'f
owr(f'
WITH
[ACH
UNIT.
HU,
9CHEMAT,CS
W'LL
I[
muto
tfH(N
MAJ0" CHAHO[I
OCC\M
.
9. •
SCUCTCO
IN
PftOOUCTION.
i"'°
,.
01
-=
.,
f"
]
iCl8
~!
J°'°'
1112
r~
-:-
01
JlO
Cl1
l .l.c,e
Cl5 I
t10,t
i
◄
1p/
I100.,
.
c•
-=
""
~
5'10
en
I
01
Cl9
0.
002
0011
I
-=
-:-
-=
Cit
....
""'
~MUT[
1101.T-
IOI
05
TftANS
l!TOftS
01
40t
◄ S
Ol
H
◄
OIO
05
H4001
04
Sl4002
OtOOU
01 01
o,
O
◄
81
01
OI
o,
m,i
""' ::m:
:mi:
11,.04
..,.o•
..
,.o,
H3V
••
"''
HO
,,.
.r~~z
lcz•
r·
°'
""'
'"'
12
~v
!OK
l>K
•
-=
TIME
OC
L
AY
CAPA
CITOR
~
02
,09
I
""
IOK
-=
-= -= -=
er
¾
R20
l
◄
V
!l
...
'<
..._
JL
Lr,
I~
..
•
-=
RZ3
ll
K
""
c
ze
<O
OK
'
64V
Cll
0.
0f
Rte
IOO
\.
♦
,lC:,O
1-
~v
~-
-
•t
-
o~~
cu
0011
""
~
ou
r
lrM•
rlf
,.
,-.~
.
r,,.
~.
OOW<A,Mt!IA
.
9- ~ -
MI
ii6ilf
0-1289

www.SteamPoweredRadio.Com
DWG
A-1584
r--------------,
I
I I
I I
I I
>----+-- •~----+----:;~+36 V.D.C.
18V.
+ C2
400
-40V.
-
-
RI
*
+· C3
11000
- 16V.
63V. _- I
I
I
I
QI I
40310
_ _.,...,..__, -----'!i..+13 V.D.C.
I W.
C4
400
I
+'
I
40V. -I
I
I
I
D5
13V .
ZENER
~ ~ ~ - I
L _____________ __J
*ADJUST TO DRAW 8 TO 10 M
a.
MC Martin _Industries. Inc .
OMAHA, NEBR.
TITLE
SCHEMATIC, POWER SUPPLY
TR-66A RECEIVER
owN BY J.M. Hansen
DATE
7-27-67
ENG K 7~- ~, - ... vi
SCALE
NONE
APP'O BY OWG
A-1584
I
i
j
I
l
i
I
I
I
I