KAAR ENGINEERING CORP.,
Palo Alto,
U.S.A.
41
ti
CONALERT II
OPERATING MANUAL
Model Designations
Cabinet Style:
117R905
Relay Rack Style:
117R906
Mfd. by Kaar Engineering Corporation
2995 Middlefield Road, Palo Alto, California, U.S.A.
TABLE OF CONTENTS
Paragraph
Page
INTRODUCTION
1
1.
DESCRIPTION OF THE CONELRAD SYSTEMS
3
2.
THE CONALERT FUNCTION
3
3.
INSTALLATION
4
a.
General
4
E.
Antenna
4
Z.
Earth Ground
6
a. External Speaker
6
e.
External Alarm
6
T.
External Reset
6
4.
OPERATING INSTRUCTIONS
6
a.
General
6
E.
Initial Installation
6
Z. To Monitor a Key Station
6
U. How CONELRAD Alarms are Indicated
7
e.
To Restore Monitoring Conditions
7
T.
Identification of True CONELRAD Alarms
7
g.
Tests for Alarm Function
8
5.
INITIAL CHANNEL TUNEUP
8
a.
General
8
b.
Tuning Procedure
10
c.
Channel RF Gain Control Adjustment
1 0
a.
Modification for Crystal Control
10
ILLUSTRATIONS
Figure
Page
1
Front View, CONALERT II
2
2
CONALERT II, Channel Tuning Controls
9
APPENDIX: TECHNICAL DATA
Technical data for use by electronic technicians is appended to the
back of the book. This consists of a schematic diagram of the Conalert
II,
a parts list, and other data which may be required for maintenance.
purposes.
INTRODUCTION
The CONALERT II is a sensitive instrument which is designed for a specific
purpose, that of monitoring radio broadcasting and automatically responding
to CONELRAD air raid defense procedures. The CONELRAD procedures are
described briefly in this booklet, together with a description of how the CON -
ALERT responds to them. Ii addition, all data which may be recpuired for
installation and operation of the unit are described in sufficient detail so that
proper operation may, in most cases, be obtained without the help of skilled
radio technicians.
Since the CONALERT performs a role which may be vital to the safety of
many lives, every design factor which makes for the utmost reliability has
been incorporated into the unit. The result is an instrument which performs
its monitoring function more reliably than any human operator who might be
assigned to the task; it even sounds its warning if a failure occurs within it-
self, or when a failure occurs at the broadcast station which it monitors.
It
cannot, of course, think for itself in the fashion of a human operator, hence
it cannot differentiate between a true CONALERT alarm and certain technical
faults which sometimes occur at the monitored station. In such cases, it sounds
the alarm as though a true CONELRAD alarm has taken place, and the human
operator must determine if the alarm is "real" or "false". This booklet ac-
cordingly includes a thorough description of what might be expected in these
matters.
1
CONELRAD ALARM Warning Indicator
Glows red to indicate Conelrad Alert.
Speaker also comes on. as well as external
alarm circuits.
Tone signal and announce-
ment will authenticate alarm.
If nothing is
heard, switch CHANNEL switch to another
station observe instructions for MONITOR
switch.
POWER indicator
(green). must glow
at all times while
monitoring.
SCHEDULE
Lists operating
hours of key
broadcast
stations
EXTERNAI. ALARM
switch: External alarm
ircuits will not operate
if this switch is OFF.
VOLUME control
Adjust for comfortable level if using
aural monitoring,
louder if using si-
lent monitoring.
CHANNEL switch
Select A. B. or C
positions according
to schedule.
After
Conelrad Alert starts.
ih7i7 positions will be
silent, turn to the Conel-
rad positions (640 kc or
1240 kc) to hear Civil
Defense broadcasts.
MONITOR switch
Pus ap to listen.
Push
down to reinstate monitor-
ing function -- Red CONEL-
RAD ALARM indication will
cease if key station is back
on the air.
Central or SI-
LENT position is for
silent monitoring only after
setting VOLUME high and
listening to make sure that
a Conelrad Alert is not in
progress.
Figure 1
- Front View, CONALERT II
2
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