STEAM POWERED RADIO.COM
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instruction
ma ual
AMR-1
RECEIVER
-
,
STEAM POWERED RADIO.COM
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MCMartin.
MCMarti~
AMR-1
RECEIVER
INSTRUCTION
MANUAL
page
I
TECHNICAL
SPECIFICATIONS
1
11
GENERAL
DESCRIPTION
1
Ill
INSTALLATION
1
IV
CIRCUIT
DESCRIPTION
1
V
TROUBLE
SHOOTING
PROCEDURE
2
VI
PARTS
LIST
3
VII
SCHEMA
TIC
DIAGRAM
4
WARRANTY
STEAM POWERED RADIO.COM
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MC
Martin.
TECHNICAL
SPECIFICATIONS
FREQUENCY
RANGE ..
.........
.
ANTENNA
INPUT
..
. ...
..
540 -1620 kHz,
fixed
tuned to
specific
frequency
. .
..
. . 75 ohms nominal unbalanced
(BNC
type
connector
)
SErJSITIVITY......
. .
30
microvolts
for
20
dB
SIN
ratio
SENSITIVITY
FOR
CARRIER
FAIL
OPERATION
. . .
..
.
AGC .
............
.
AUDIO
FREQUENCY
RESPONSE .
...
. . . .
HARMONIC
DISTORTION .....
.
NOISE
LEVEL. ...
.
at 30% modulation
.
.........
100
microvolts
minimum
...............
. .
...
......
60
dB
.....
±1.0 dB, 50-5000 Hz;
±3 dB,
5-10 kHz
....
less
than 3%
at
90% modulation
.
....
.45
dB
or greater below 100%
modulation
with
10
mV
input
SELECTIVITY.....
.
.........
±10
kHz , at 6
dB
points
AUDIO
OUPUTS...
600 ohms balanced
at
O dBm and
600 ohms unbalanced
at 1.0V
rms
POWER
REQUIREMENTS... . .....
.
115
Vac ,
50/60
Hz, 6 watts
DIMENSIONS . . . . . . .
..............
1¾" (4.45 cm) H x
19"
(48.3 cm) W x
5" (12.7 cm) D
FINISH
. . . . . . . . . . . .
............
McMartin beige
with
wood grain
trim
II
GENERAL
DESCRIPTION
The
McMartin Model AMR-1 is a low
cost
, high perfor-
mance,
single
channel AM broadcast
receiver
for
use· as
a
reliable
off-air
source
for
house
monitoring
systems.
It
is
also
intended as a companion AM
receiver
unit
for
use
with
the McMartin Model EBS-2 EBS Decoder.
The
AMR-1
contains a monolithic
silicon
integrated
cir
-
cuit
from
which
the
RF
amplifier, IF
amplifier,
mixer,
oscillator,
and AGC
detector
are
constructed.
It
operates
on
the
superheterodyne
principle
with
a 455
kHz
IF
frequency A cascade
IF
amplifier
with
controlled
output
impedance and
negligible
Miller-effect,
eliminates
regeneration and
selectivity
skewing
. A
discrete
diode
2/76
detector
and
audio
amplifier
are
also
provided from
which
both 600
ohm
balanced output
at
a O dBm
level
, as we
ll
as
unbalanced audio
at
a no
minal
1.0
volt
level
are
brought out to
rear
chassis
screw t
erminals
. The
latter
serves
as
audio drive
for
the EBS
-2
monitor. The AMR -1
circuitry
also
includes a carrier
off
relay
closure
to ac-
tivate
external
alarm devices in the event the control sy
s-
tem becomes inoperative.
The
AMR-1 is a co
mpletely
self-<:ontained, rac k mount
unit
occupying 1 3/4-
of
vertical
space.
An
illum
inated
front
panel power
switch
is
also
provided"
Ill
INSTALLATION
Upon
receipt
of the AMR-1, remove
it
from the
shipping
carton
and
inspect
it
carefully
for
any damage caus ed in
trans
it.
If
any damage is found,
notify
the
shipping
agency and
advise
McMartin
Industries
of such
action.
Remove the
top
cover
of the AMR~1 and
inspect all inter•
nal
circuitry
for
damage .
The
AMR~1 should be mounted in a temperature environ -
ment of less than
so<>c
.
Connect
the antenna to the antenna BNC connector lo-
cated on the rear
of
the
chassis.
NOTE: In
high
signal
strength areas
only
a short piece
of
wire
will
provide adequate input
signal
level.
Where
low
signal
field
strengths
are involved a
more
elaborate
antenna
will
be
required.
If
the 600
ohm
balanced output
termination
is
to
be em-
ployed
for
house
monitoring
purposes, the connection
should be made
using a twisted,
shielded
pair.
If
the
EBS-2,
Emergency
Broadcast
Decoder, is to
be
used, the unbalanced
audio
output
terminations
must
be
connected to the appropriate
locations
on the rear chassis
of
the EBS-2.
Connect
the power cord
to
a 117 Vac source and turn the
power
switch on.
The
AMR-1 should now
be
operational.
IV
CIRCUIT
DESCRIPTION
The
AMR-1 is a complement
of
four subsystems; an
RF
receiver
section, a diode
detector,
an
audio
amplifier,
and the
carrier
fai l
relay
circuit
.
The
RF
receiver
contains a CA3123E
integrated
circuit
and a
discrete
IF
amplifier.
The
antenna
input
is coupled through
capacitor
C1
to the
input
tank
composed of the primary of
T1
and
C2 which
is
tuned to the input
frequency.
The secondary of
T1
is
connected
to
the
RF
amplifier
portion of IC-1
at
pin
12.
The
output
of the
RF
amplifier
feeds the
RF
amplifier
tuning
section,
composed of L1, C3, and CS.
This
pro-
vides
additional
input
selectivity.
1
STEAM POWERED RADIO.COM
MCMartin.
2
T_he
amplified
RF
is
then fed
to
pin 1
of
IC-1
which
is
the
mixer
input. The
parallel
tuned
circuit
(L2,
C7,
and
CS)
establishes
internal
oscillator
frequency,
which
when
mixed
with
the input
signal
frequency, produces a 455
kHz
IF
frequency
at
the mixer output (pin 14 of
IC1
). C7
and
CS
insure
stable
operation
of
the
oscillator
within
ambient temperature
variations.
T2 provides
selectivity
prior
to
IF
amplification.
The
IF
amplifier
input appears
on
pin 7 of
IC-1.
The output (pin
6)
is
capacitive
coupled
to
pin 5, the AGC
drive
input,
and
also
connected
to
the tap of
T3.
T3 provides
addi-
tional
post
IF
selectivity
and through C18
drives
the
base
of
01.
01 is a common
emitter
gain
stage
which
in-
creases the
IF
signal
to a level
sufficient
to
drive
the
diode
detector.
02
is an
emitter
fol
lower
which
prevents
loading
of
01 by the
detector.
Diode
D1
serves as the AM
detector.
It
is
followed
by a low pass
filter
and an
audio
amplifier
stage
04.
05
is
connected as
an
emitter
follow-
er.
The
emitter
of
05
is
capacitive
coupled to the unbal.-
anced 600
ohm
output and
also
to the primary of
T5.
The
secondary
of
T5
is connected to the balanced 600
ohm
o-
utput.
termination.
D2 generates a negative
de
voltage
at
the base of
03
proportional
to
the
carrier
level.
03
will
be
biased in the •ott•
condition
as long as
carrier
is
present.
When
the
carrier
is
removed,
03
wil I be
switched
"on•,
energizing the c•
oil
of
carrier
fail
relay,
K1.
The
discrete
circuits
in the AMR-1 are powered from a
-+22
volt
de source, produced
by a full
wave
rectifier
and
an RC
filter.
IC-1 operates from a
+13
volt
de
supply,
regulated by
Z1,
and derived from the, +22
volt
de
supply.
V
TROUBLE
SHOOTING PROCEDURE
The AMR-1 has been aligned
at
the factory
to
conform
to
the published
specifications.All
tuned
circuits
have been
adjusted to provide maximum band-width and high
select-
ivity.
A perfect
field
alignment cannot
be
accomplished
without
proper
test
equipment, therefore,
if
this
is
de-
sired
it
is
recommended that the
unit
be
returned to the
factory.
However, the
AMR-1
can
be
aligned in the
field,
to
pro-
vide
satisfactory
operation,
with
the
following
proced-
ures:
Connect a volt-ohmeter to
test
point
"N'
located
on
the printed
circuit
board and
adjust
the meter
for
an
"on-scale"
positive
voltage reading.
Adjust
L2 for a
minimum
positive
voltage
at
test
point
"A".
If a dip
cannot
be
noticed
on
the meter when the
slug
of
L2 is
tuned, the
field
strength
at
the antenna input
may
be
too low. Tune
T1
and
L1,
in that order,
for
the same
condition
at
test
point
"A"
.Alternately,
tune T2 and
T3 for the minimum voltage
at
test
point
"A".
Repeat
the tuning of
L2,
T1,
and
L1
for
the same
test
condi-
tion.
The
AMR-1 should now
be
tuned
to
respond
to
the input
signal
frequency.
NOTE:
This
tuning procedure
will
result
in maximum
selectivity,
therefore, the 6
dB
bandwidth
speci-
fication
cannot
be
guaranteed
if
this
tuning pro-
cedure is used. Greater audio bandwidth can
be
obtained by
slightly
detuning
T1
and
L1.
In the event
of
malfunction,
check
the
following
symp-
toms and procedures:
A.
Carrier
fail
relay
will
not operate
1.
Check power
supply
voltage
2.
Short the
collector
of
03
to
ground and determine
if
relay
is
functional
3.
Check
03
and D2
4.
Check ~.,tenna input
RF
level.
It
should
be
a min-
imum of 100
microvolts.
B.
No
audio
output
1. Connect
VOM
to
test
point
"A"
and remove
an-
tenna. The voltage reading
on
the meter should
rise.
This
indicates
that
IC-1 is
working
properly.
a. Trace the
signal
through
01, 02,
D1,
04,
and
05
unti I trouble
is
located.
3.
Check power
supply
4.
Perform a I ignment procedure
C.
Audio
output
distorted
1 •
Check
power
supply
voltage
2.
Insure
that
antenna input
is
not overloaded, by
re-
due ing antenna length.
3.
Perform a I ignment procedure
D.
Noise in
audio
output
1 • Cheek a
11
grounds
2.
Antenna input
signal
level
Is
probably too
low,
In-
crease antenna
length.
E
.All
other problems should
be
referred
to
the
factory
by
contacting
the McMartin's Customer Service
Manager.
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STEAM POWERED RADIO.COM
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MCMartin.
8/74
VI
PARTS
LIST
The
majority
of
the
components used In the AMR-1 are of standard values and tolerances and are gener-
ally
available
from local
electronics
parts
distributors.
The
following
list
includes
those items
of
crit-
ical
value
and
tolerance
or components manufactured by McMartin
Industries.
SYMBOL
T4
SW-1
F1
SYMBOL
T1,2,3
T5
L1, 2
K1
IC-1
01,3,4
02,5
D1, 2
D3,4
21
ca
GENERAL
PARTS
P/N
900037
480029
280033
PRINTED
CIRCUIT
BOARD
P/N
940014
910029
930098
470029
230048
201056
201049
220006
210008
220007
DESCRIPTION
Power transformer
Power
switch
assembly
1
/16
amp fuse
DESCRIPTION
Transformer
Output transformer
Inductor
Carrier
fai I relay
CA3123E
2N3569
SE4002
IN87 diode
IN4006
{l lode
13
voltzener
Selected in production
3
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13000/25VI470/
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12K
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270
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STEAM POWERED RADIO.COM
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MC
Martin.
WARRANTY
McMartin products are warranted to
be
free from
defects
in materia Is
and workmanship
for
a period
of
one year
after
shipping
date,
when
subjected
to normal usage and
service.
All
warranties
are void
if
(a) equipment has been
altered
or repaired by others
without
McMar-
tin's
specific
prior
authorization;
or (b) equipment
is
operated
under environmenta I
conditions
or
circumstances
other than those
specifically
described
in
McMartin
literature
or
instruction
man-
uals.
Upon
notification
within
the
applicable
warranty period, McMartin
agrees
without
charge, to
repair,
replace,
or
supply
replacement
parts
for
any properly
maintained
equipment or parts
that
are
de-
fective
as
to
design,
materials,
or workmanship and
that
are
re-
turned
in
accordance
with
McMartin's
instructions
to the Buyer.
At
McMartin's
sole
discretion,
the Buyer may
be
re:iuested
to
re-
turn the
defective
part
or equipment
to
McMartin,
FOB
Omaha,
Nebraska.
Parts
or equipment may
be
returned
only
with
McMar-
tin's
prior
authorization
and must
be
identified
by a return
auth-
orization
number issued
by
McMartin's
Customer Service
Depart-
ment.
Al
I merchandise so returned must be
sent
transportation
prepaid,
at
Buyer's
risk.
Full
details
of
the
failure
or
malfunction
should
be
included
so as to
expedite
repair
or replacement.
Re-
pair
parts or repaired
or
replaced equipment
wi
II
be
returned to
the
Buyer,
FOB
factory.
STEAM POWERED RADIO.COM
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