DRAKE ML-2 User manual

STANDARD
WARRANTY
R.
Le
DRAKE
COMPANY
warrants
each
new
radio
product
manufactured
by
it
to
be
free
from
defective
material
and
workmanship
and
agrees
to
remedy
any
such
defect
or
to
furnish
a
new
part
in
exchange
for
any
part
of
any
unit
of
its
manufacture
which
under
normal
installation,
use,
and
service
discloses
such
defect,
provided
the
unit
is
de-
livered
by
the
owner
to us
or
to
our
authorized
radio
dealer
or
wholesaler
from
whom
purchased,
intact,
for our
examination,
with
all
transportation
charges
prepaid
to
our
factory,
within
ninety
days
from
the
date
of
sale
to
original
purchaser
and
provided
that
such
examination
discloses
in
our
judgement
that
it
is
thus
defective.
Should
a
malfunction
be
suspected,
write
in
detail
to
our
Service
Department
for
suggestions
concerning
the
operation,
repair
or
return
of
your
unit
if
it
should
prove
necessarye
This
warranty
does
not
extend
to
any
of
our
radio
products
which
have
been
subjected
to
misuse,
neglect,
accident,
incorrect
wiring
not
our
own,
improper
installation,
or
to
use
in
violation
of
instructions
furnished
by
us,
nor
extend
to
units
which
have been
repaired
or
altered
outside
our
factory,
nor
in
cases
where
the
serial
number
thereof
has
been
removed,
defaced
or
changed,
nor
to
units
used
with
accessories
not
manufactured
or
recommended
by
us.
Any
part
of
a
unit
approved
for
remedy
or
exchange
hereunder
will
be
remedied
or
exchanged
by
the
authorized
radio
dealer
or
wholesaler
without
charge
to
the
owner.
This
warranty
is
in
lieu
of
all
other
warranties
expressed
or
implied
and
no
representative
or
person
is
authorized
to
assume
for
us
any
other
liability
in
connection
with
the
sale
of
our
radio
products.
The
Re
Le
DRAKE
COMPANY
reserves
the
right
to
make
any
improvements
to
its
products
which
it
may
deem
desirable
without
obligating
itself
to
install
such
improvements
in
its
previously
manufactured
products.
R.
Le
DRAKE
COMPANY
MIAMISBURG,
OHIO
45342
@

ML=2
CORRECTIONS
&
PART
CHANGES
In
some
ML=2's
the
following
parts
have
been
changed
as
noted
below,
In
each
case
these
parts
are
electrically
interchangeable,
2S8C 460
28C458
28C741
181555
Diode 2007 or 207 "
Diode SRIEM1
Diode SRIEM8
changed to
28C838
28C 945
280319
18953
RD-7A-M
Fe14A
F-14D
ML-2 TRANSMIT. & RECEIVE CRYSTALS
Crystals
for
your
ML-2
are
available
from
the
R. L.
Drake
Company
at
a
cost
of
$5.00
per
crystal.
Prior
authorization
must
be
obtained
from
the
R.
L.
Drake
Company
before
returning
crystals
for
any
reason.
Servial hte - 10 932
R, L, Drake Company
September 21, 1971
orca

ML-2
MARKER
LUXURY
TRANSCEIVER
PAGE
1.
GENERAL
DESCRIPTION
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FEATURES.....
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POWER REQUIREMENTS ...ssseeceeeoeees
SPEAKER AND HEADPHONE REQUIREMENTS . see
MICROPHONE REQUIREMENTS .+.sssssesesecsseceusesecs
w CONTROL FUNCTIONS ......... teeeee avec eeceee 5
FRONT PANEL CONTROLS ..ccscecccscccccecccesreereres
On-Off Switch ..
Volume......
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INTERNAL CONTROLS ....-ssecccecccccrcoccecesiovese
Deviation Controls ......eeeeeeee
Transmitter Frequency Adjustment ...
Receiver Frequency Adjustment ....
S-Meter Sensitivity Adjustment ........ .
Relative RF Output Meter Adjustment ......
NNNNNN
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> CRYSTAL ORDERING INFORMATION.....-.e0002 7
5. TROUBLE SHOOTING. cccccsvccccersccevcscecseceee B
6.
SCHEMATIC
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Fold
Out

1.1
1.2
1.2
vl
GENERAL
FEATURES
DESCRIPTION
The
ML-2
is
a
2
meter
VHF
-
FM
Transceiver
with
a
capacity
for
12
channels
and
will
operate
from
either
120
VAC
50
-
60
Hz
or
13.5
VDC.
SPECIFICATIONS.
GENERAL
Frequency Coverage:
Number of Channels:
144 - 148 MHz
Completely transistorized with a 6360 PA tube.
12 channels,
3 supplied.
Channel 1 Channel 2 Channel 3
Receive: 146.94 MHz Sreteceas= 146.76 MHz
Transmit: 146.34 MHz ARS SSeS 146.34 MHz
Simplex: —if| ---------- 146.94 MHz =| ----------
Modulation: Frequency Modulation
Transmitter Control:
Power Drain:
Push-to-talk
A.C, | D.C.
“Receive:
6
watts
0.5
amps
Transmit:
50
watts
4.0
amps
Power
Source:
A.C.
120
Volts,
50
-
60
Hz.
D.C. 13.5 Volts, + 10%
Dimensions;
Weight:
Accessories Supplied:
7-7/8"
W
x
2-3/4"
H
x
10-1/4"
D
8-1/4 pounds.
-Antenna;
Dynamic Microphone,
Antenna Connector Plug,
AC/DC Power Cord,
Speaker Plug,
Mobile Mounting Bracket.
Page lL.

1.2.2
1.2.3
RECEIVER
Receiver Circuit:
ist 1.F. Frequency:
2nd I.F. Frequency:
Antenna Input Impedance:
Sensitivity:
Spurious Sensitivity:
Audio Output:
TRANSMITTER
RF Output Power:
Frequency Deviation:
Frequency Stability:
Spurious Radiation:
Completely transistorized crystal controlled
double conversion superheterodyne .
10.7 MHz
455 kHz
50 to 75 ohms
0.5 microvolt or less for 20 dB quieting.
1 microvolt or less (30 dB S + N/N ratio
at 10 kHz deviation with 1 kHz modulation.
Greater than - 60 dB
0.5 watt at 10% or less distortion
10 watts conservative
Adjustable to 15 kHz maximum.
Factory set to $ kHz
+ .001% or less.
Greater than - 80 dB below carrier.
Page 2.
0

2. INSTALLATION
2.4
UNPACKING
@
Carefully
remove
the
Marker
Luxury
Transceiver
from
its
carton
and
examine
it
closely
for
signs
of
shipping
damage.
Should
any
be
apparent,
notify
the
delivering
carrier
immediately
stating
the
full
extent
of
the
damage.
Fill
Out
and mail
the
enclosed
registration
card
so
your
warranty
will
be
effec-
tive.
Save
the
packing
material.
You
may
need
it
later
for
reshipment
or
storage.
Inspect the packing material closely before putting it away to be sure you
have not overlooked the accessories packed with the unit.
2.2 LOCATION _
In general, the location of the Marker Luxury is not critical. However,
care
should
be
taken
to
insure
that
space
is
provided
around
the
unit
to
allow
adequate
air
circulation.
Extremely
hot
locations,
such
as
near
radiators
or
heating
units,
should
be
avoided.
DO
NOT
cover
the
top
of
the
unit
with
books,
papers
or
pieces
of
equipment
or
overheating
may
result.
2.3
ANTENNA
REQUIREMENTS
The
Marker
Luxury
Transceiver
is
designed
for
use
with
antennas
resonant
~
on the
operating
frequency
and
having
an
impedance
of
50
ohms.
The
e@
antenna
we
supply
must
be
adjusted
to
the
operating
frequency.
Tools
and
a
chart
are
supplied
for
this
adjustment.
The
antenna
can
be
adjusted
most
accurately
with
a
Drake
WV-4
Wattmeter
in
the
transmission
line.
With
the
WV-4
Wattmeter
in
the
line,
adjust
the
length
of
the
antenna
for
minimum
reverse
power
reading.
2.4
VERTICAL
ANTENNAS
Vertical
antennas
without
their
ground
planes should
not
be
used
with
the
ML-2.
Omission
of
the
ground
plane
causes
excessive
RF
ground
current
on
the
ML~2
case
resulting
in
RF
feedback
and
reports
of
hum
on
the
ML-2
transmitted
signal.
2.5
POWER
REQUIREMENTS
The
Marker
Luxury
Transceiver
is
factory
wired
for
use
with
120
volts
50
-
60
Hz
and
13.5
volts
DC.
For
use
on
120
volts,
insert
the
power
connector
with
the
line
cord
attached,
into
the
power
plug
on
the
rear
of
the
transceiver.
For
use
with
13.5
volts
DC,
insert
the
power
connector
with
the
red
and
black
wires
attached,
into the
power
plug
on
the
rear
of
the
transceiver.
The
red
wire
is
the
positive
lead
and
the
black
wire
negative.
The
fuse
in
the
positive
lead
has
a
value
of
6
amperes.
The
120
volt
fuse
has
a
value
of
2
amperes.
Page 3.

2.6
2.7
SPEAKER AND HEADPHONE REQUIREMENTS
The
Marker
Luxury
Transceiver
has
a
built-in
speaker.
An
external
8
ohm
headphone.
or
speaker
may
be
plugged
into
the
miniature
phone
jack
on
the
rear
of
the
transceiver
chassis
next
to
the
R.F.
output
connector.
Plugging
an
external
speaker
or
headphone
into
this
jack
turns
off
the
built-in
speaker.
MICROPHONE REQUIREMENTS
A 500 ohm dynamic microphone with a push-to-talk switch is supplied with
the Marker Luxury Transceiver. A carbon microphone may be used with the
transceiver and connection to the microphone plug is shown in the
schematic.
Page 4.