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Ramsey Electronics COM 3 User Manual

Ramsey Electronics COM 3
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5).
Touch
the
DEVIATION
key,
and
two
red
lights
will
light,
one
on
each
side
of
the
(1.5KHz)
bargraph
display.
Turn
on
the
transmitter,
mute
the
microphone
so
no
voice
or
background
noise
is
transmitted.
The
bargraph
display
should
be
indicating
+1
KHz.
of
CTS
tone
deviation.
NOTE
Typical
CTS
tones
have
a
deviation
of
0.6
KHz,
therefore,
we
should
adjust
the
deviation
for
a
reading
of
0.6
KHz.deviation.
Four
LEDs
on
each
side
of
the
center
LED
should
be
lit,
indicating
that
0.6
KHz
of
CTS
deviation
is
seen.
44.4
TRANSMITTER
DEVEATION
MEASUREMENT
.
1)
Connect
the
whip
antenna
to
the
RF
INPUT
jack.
2)
Enter
in
464.15,
then
touch
the
MONITOR
FM
key.
3)
Connect
the
tranceiver
to
be
tested
to
an
antenna
or
dummy
load.
(DO
NOT
under
any
circumstances
connect
a
transmitter
to
the
RF
INPUT
of
the
Com3,
serious
damage
will
result.)
4)
Touch
the
DEVIATION
key,
and
two
red
lights
will
light,
one
on
each
side
of
the
(£1.5KHz)
bargraph
display.
Key
the
transmitter,
mute
the
microphone
so
no
voice
or
background
noise
is
transmitted.
Four
LEDs
on
each
side
of
the
center
LED
should
be
lit,
indicating
that
0.6KHz.
of
CTS
tone
deviation
is
seen.
5)
|
Touch
the
DEVIATION
key,
and
two
red
lights
will
light,
one
on
each
side
of
the
(+7.0KHz)
bargraph
display.
Voice
test
the
transmitter,
all
ten
LEDs
on
each
side
of
the
center
LED
should
light
up
with
voice,
indicating
(+7.0
KHz)
of
deviation.
NOTE
`
it
is
important
to
adjust
the
CTS
tone
deviation
first,
before
adjusting
the
voice
deviation.Since
the
CTS
tone
will
be
added
to
the
voice
and
will
increase
it's
overall
deviation.
6)
Perform
the
voice
test
again
and
adust
the
transmitter
for
(+5.0
KHz)
deviation.
Six
LEDs
on
each
side
of
the
center
should
light
indicating
a
total
deviation
of
(+5.0
KHz)
including
CTS
tones.
4.5
20
dB
QUIETING
MEASUREMENT
This
test
allows
you
to
measure
the
sensitivity
of
a
receiver.
|
i
1)
Connect
an
AC
voltmeter
to
the
speaker
terminals
of
the
transceiver.
2)
Open
the
transceiver's
squelch
and
adjust
the
volume
control
for
a
nominal
reading
on
the
AC
voltmeter
(for
this
example;
1
volt).
3)
Connect
a
cable
between
the
tranceiver's
antenna
input
and
the
Com
3's
RF
OUTPUT.
4)
Enter
in
469.15,
then
touch
the
GENERATE
RF,the
FM,
and
1
KHz
keys.
The
red
light
should
be
"on"
next
to
the
GENERATE
RF
and
FM
keys,
and
"off"
nextto
the
1
KHz
key.
5)
Select
the
X1
range
on
the
attenuator
by
touching
the
LEVEL
UP
or
LEVEL
DOWN
keys
until
the
red
light
next
to
the
X1
is
lit.
(
the
output
range
is
now
0.1
to
1.0
pV).
6)
Increase
the
output
level
until
the
AC
voltmeter
reading
drops
20
dB,
or
to
0.1
volts.
The
setting
of
the
MICROVOLTS
knob
will
be
the
20
dB
quieting
measurement.
NOTE
If
the
receiver
is
not
sensitive,
you
may
have
to
change
the
attenuation
scale
to
the
next
higher
range.
Touch
the
X10
key
and
repeat
step
(6)
until
0.1
volts
is
read
on
the
AC
voltmeter
(
the
output
range
is
now
1.0
to
10.0
pv).Keep
going
up
until
20
dB
of
quieting
is
achieved.

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Ramsey Electronics COM 3 Specifications

General IconGeneral
BrandRamsey Electronics
ModelCOM 3
CategoryMonitor
LanguageEnglish

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