Ramsey Electronics COM 3 User Manual

41. INTRODUCTION
This
chapter
outlines
typical
measurements.that
can
be
made
with
the
Com
3.
For
our
example
we
will
use
a.FM
transceiver
with
a
receive
frequency
of
469.150
MHz,
a
transmit
frequency
of
464.150
MHz,
with
a
CTS
tone
of
82.5
Hz.
.NOTE
The
COM
3
DOES
NOT
have
an
enter
key.
After
entering
in
the
desired
frequency
a
function
must
be
selected
to
complete
the
entry,
or
nothing
will
happen.
(ie
enter
in
464.150
then
touch
the
GENERATE
FM
key)
The
function
keys
are
(GENERATE-FM
,
MONITOR-FM
and,
MONITOR-AM).
If
you
change
the
frequency
within
a
mode,
you
must
touch
the
same
function
key
again
to
complete
the
function,
or
you
will
Selecta
different
operating
mode.
This
does
not
apply
to
the
frequency
storage
or
increment
modes.
Section 4
Typical Test Setups
4.2 FREQUENCY COUNTER OFF AIR
This
test
allows
you
to
count
the
frequency
of
8
transmitter
off
air,
this
is
especially
useful
for
identifying
the
frequency
of
unmarked
radios
that
come
in
for
repair.
1)
Connect
the
whip
antenna
to
the
Com
3's
RF
INPUT.
2)
Push
the
COUNT
RF
key,
then
key
the
transmitter,
the
display
will
indicate
the
transmitted
frequency
(in
MHz).
NOTE
You
may
have
to
bring
the
transmitter
within
a
few
-
inches
of
the
Com
3's
whip
antenna
in
order
to
achieve
a
stable
count.
This
is
due
to
the
fact
that
the
Com
3
is
less
sénsitive
as
a
frequency
counter
(typically 25 millivolts) in this mode.

Ramsey Electronics COM 3 Specifications

General

Brand	Ramsey Electronics
Model	COM 3
Category	Monitor
Language	English