Ramsey Electronics COM 3 User Manual

(30) +OFFSET/-OFFSET: programmable offset
keys for repeater service, or channel stepping.
(31) CLR: clears the current entry in the display
(32) RCL: recalls a previously stored test setup.
(33) STO: stores the currenttest setup into one
of the Com3's ten memories ( 0 - 9).
3.3 INITIAL TURN ON
Connect the rear panel AC line cord to a
suitable power outlet and turn the power switch
on. The front panel display will light indicating
power on. When first turned on The Com 3
should always start out with these settings.
Display : 450.0000 MHz
Generate RF: on
FM: on
1 KHz: on CTS: off Ext.tone: off
Deviation: on, 1.5 Khz range selected
X10K: on
If these conditions do not exist refer to the
trouble shooting section.
Com 3's equipped with the standard OCXO will
generate _ 10001 precision signals — within10
minutes, Units equipped with the high stability
XO will produ .5ppm accur after 1
minutes. When using the Com 3 in cold
environments longer warm-up times may be
required.
DETAILED OPERATION OF THE COM 3
3.4 GENERATE RF
To generate an RF frequency, type in the
desired frequency then touch the GENERATE
RF
key.
NOTE:
the
display
always
reads
the
frequency in Mhz, therefore an entry of 10 would
generate 10 Mhz, an entry of 0.1 would
generate
100Khz.
For
frequencies
above
100
MHz,
it
is
not
necessary
to
enter
the
decimal
point.
3.5 RF OUTPUT LEVEL
The output level is controlled by a five step
attenuator and a variable attenuator. The ranges
available are; K
0.110 1.0ጩ/ ,1.0 to 10.0 nv ,10.0 to 100ፌሃ.
100 to1,000 ዚዜሃ,1,0001510,000 pv.
To select the desired range, touch the LEVEL UP
or LEVEL DOWN key to select the desired range.
An LED will light next to the range selected. The
output can be controlled within the range by the
control knob labeled MICROVOLTS.
3.6 FM MODULATION
To FM modulate the RF frequency selected, touch
the FM key. The deviation is adjustable by the
MODULATION: control knob. The indications on
the knob have no reference to the FM deviation,
they are used for AM. modulation. The deviation will
be displayed automatically on the LED bargraph.
3.7 AM MODULATION
To AM modulate the RF frequency selected, touch
the AM key. The percentage of modulation is
adjustable by the MODULATION control knob and
is variable from 10 to 100 percent.
3.6 CTS TONE GENERATION
The
Com3
will
generate
all
the
standard
CTS
tones
(see
table
3.1).
CTS
can
be
generated
in
either
the
AM
or
FM
modulation
modes,
and
in
conjunction
with
`
the
internal
1Khz
tone
source,
or
an
external
tone
source.
To
generate
a
CTS
tone
touch
the
CTS
key,
enter
the
desired
frequency,
then
press
the
CTS
key
again.
The
display
will
show
the
current
CTS
tone
being
generated.Power
up
default
tone
is
(100.0
Hz).
If
an
improper
tone
is
entered,
it
will
not
be
accepted.
To
return
the
display
to
the
generated
RF
display,
just
touch
the
GENERATE
RF
key,
to
display
the
CTS
tone
touch
the
CTS
key.
The
MODULATION
knob
will
control
the
deviation
of
the
CTS
tone
when
inthe
CTS
mode.

Ramsey Electronics COM 3 Specifications

General

Brand	Ramsey Electronics
Model	COM 3
Category	Monitor
Language	English