Ramsey Electronics COM 3 User Manual

(6) COUNT RF: enables the Com 3's RF
frequency counter. The display wil show the
frequency being measured. Display indicates in
MHz.
(7) COUNT AF: enables the Com 3's audio
frequency counter, the display indicates in KHz.
(8) MONITOR FM: enables the monitor FM
mode, the display indicates the frequency
selected for monitoring.
(9) MONITOR AM: enables the monitor
AM mode, the display indicates the frequency
selected for monitoring.
(10) EM: enables the FM modulation mode.
Only operates inthe GENERATE RF mode.
(11) AM: enables the AM modulation mode.
Only operates inthe GENERATE RF mode.
(12) CTS: enables the CTS mode Generates
all standard EIA CTS tones from 50 Hz to 300 Hz
(see table 3.1) Only operates in the GENERATE
RF mode. |
(13) i KHz: enables the internal 1 KHz tone
source. Only operates in the GENERATE RF
mode.
(14) EXTERNAL: allows an external
modulation source to be connected to the Com 3's
external input. Signal can be looped through using
the IN and OUT jacks (numbers 15 and 16
respectively). Only operates in the GENERATE
RF mode. -
(15) ከህ: jack is for the input of an external |
modulation source. Approximately 1v p-p required
for 3 KHz deviation.
(16) | QUT: jack allows the external source to be
looped through the Com 3. Also will source CTS
and 1 KHz if so selected.
(17) MODULATION KNOB: controls the
percent modulation in AM mode,and the deviation
in FM mode. In the FM mode,the bargraph will
indicate the amount of FM deviation.
(18 BAR GRAPH DISPLAY: a 20 segment
LED bar graph display which shows deviation in
one mode and frequency error inthe other mode.
(19) FREQUENCY: sets the bargraph into
frequency error mode, touching the key again
changes the frequency range. 2 LED's light up,
one on each side of the range selected. l
(20) DEVIATION: sets the bargraph into
deviation mode, touching the key again will
change the deviation range. 2 LED's light up, one
on each side of the range selected.
(21) LEVEL UP: increases the output level in
1 dB. steps.
(22 LEVEL DOWN: reduces the output level
in 1 dB. steps.
(23) ATTENUATOR DISPLAY: indicates the
attenuator range selected.
(24) MICROVOLTS: control knob varies the -
output within the range selected.
(25) MONITOR AF OUT: jack allows deviation
to be rnonitored by using an oscilloscope.
(26) RF OUT: output jack thru which the
generate RF signal is available, and also the input
for a transmitter,
(27) RF IN: input jack for the Com 3's RF
frequency counter and Frequency / Deviation
receive monitor.
WARNING : Do not connect a transmitter to this
jack or serious damage will result!
(28)
Q-9:
used
for
numeric
data
entry
into
the
Com3.
(29) [፲1.., ihe Com 3 in 500 HZ-
increments up or down. Useful for checking a
receiver's discriminator zeroing.

Ramsey Electronics COM 3 Specifications

General

Brand	Ramsey Electronics
Model	COM 3
Category	Monitor
Language	English