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GENERAL DESCRIPTION Tone Alarm
The Transistor Monitoradio is a double conversion su The Regency Tone Alarm is a system by which select
perheterodyne receiver designed for use in the narrow ed receivers on the same frequency may be alerted with
band FM channels of the Public Service Communications out disturbing any other receivers. The heart of the
bands. These channels cover the police, fire, private system is a very selective, highly stable, resonant reed
telephone, civil defense, forestry and other communi relay which produces an audible alarm when actuated.
cation services. The two groups of frequencies set a- Upon receipt of an alerting signal from the transmitter
side for this purpose are commonly called the "high" the resonant reed relay is actuated, the volume in
band which extends from 148 megacycles to 174 mega creases to maximum (regardless of volume control set
cycles and the "low" band which covers 30 megacycles ting), an external alarm socket is energized and the
to 50 megacycles. receiver is readied to receive the exclusive message
which follows. Various combinations or channels of
There are four models of the Transistor Monitoradio, dual tone signals may be used to alert different groups
two in the high band and two in the low band. Each band of receivers. When the transmission has been com
has a single channel model and a multiple channel model. pleted the Tone Alarm system may be reset to quiet
Built-in provisions are included in all models for the operation, ON CALL, until another alerting signal is
optional tone alarm described later in this manual. received.
Model No. Freq. (Me) No. of Channels TM OPTION KITS
TM-H1 148 to 174 1 These Kits have been created to fill the diversified
TM-H2 148 to 174 2 - 6 needs of our customers and to allow maximum utili
TM-L1 30 to 50 1 zation of the Transistor Monitoradio. The kits are des
TM-L2 30 to 50 2 -6 cribed as follows:
All of the models have narrow bandwidth, a high de KIT #1
gree of sensitivity, low power consumption, two way
power supply, high audio output and remote speaker The 12 VDC Power Cord - This power cord is an option
provisions. The small size and light weight allows a which allows the receiver to be operated from any 12
degree of portability which is not attainable in the tube VDC power source with a negative ground. There is
type radios. The Transistor Monitoradio uses 17 tran an inline fuse holder for protection of the source.
sistors and 7 diodes to insure the quality of perform
ance needed for the narrow band FM systems. KIT #2
Specifications The Emergency Battery - The Emergency Battery will
switch into the circuit automatically if the 117 VAC
Size----------------------- 11 "wide x 4-3/4 "high x 7-1/2 "deep power fails. This assures the user that his receiver
Weight-------------------5-1/2 pounds will always be ON CALL and ready to operate, even in
Power--------------------117 VAC - 10 watts maximum times of disaster. The battery is not intended to be
12 VDC - 4.5 watts maximum operated as a portable battery due to its limited capa
Sensitivity------------- 1^ volt or less (20db quieting) city. Its capacity is approximately 10 hours under
Selectivity------------- 60 db @ ± 40 KC; 3db @ ± 7 KC standby conditions and this should be ample time for
Audio Output---------- 1.5 watts the user to discover that the house power has failed.
RF Input Impedance-50 - 702 When the house power fails the pilot lamp will go out
but the receiver stays on. If it is necessary to use the
receiver for long periods of time after the power fail-
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