Sine Systems RFC-1/B Instruction Book

"OFF" Relay t NO < ---------
12 VDC (+) <---------
Note . This circuit "powers up" with the latched output "ON."
Note; This circuit "powers up ” with the latched output “ OFF. 1
Parts List ;
RY1 ; DPDT relay; 1OA contacts, 12VDC coil (Radio Shack 275-218)
DI : 1N4005 (RadioShack 276-1004)
Power Source: 12 VDC wall pluy supply (Radio Shack 273-1652)
♦ Omit DI if an AC rela y is used.
If a transmitter requires a maintained contact to operate the filaments, for example, the left of
the above circuits is recommended. The only disadvantage of an electrically latched relay in
this application is that if the power were to fail momentarily when the filaments were off, they
would be turned on. For filament supplies, this would not normally be a problem. For plate
voltage supplies, a mechanically or electrically latched relay would likely be necessary.
Failsafe Operation
For applications that require it, Sine Systems offers the model AFS-1 Dual Channel Audio
Failsafe unit. This device bridges one or two audio sources (a program line, for example) and
will open a relay contact when audio is absent from both inputs for 4 minutes. This can be
used as an alternate means to turn a broadcast transmitter off in the event of a telephone line
failure.
Other possible means of alternate means to turn off a broadcast transmitter are the squelch
relay in an STL receiver, the use of the "dedicated control port" described later in this section,
and, in applications where an AM station is rebroadcasting an FM station, the "Stereo Pilot"
LED in an FM receiver.
Initial Programming
The initial (programmed at the factory) user-programmable settings are contained in the
“ Software" instruction book.
Battery Back-up
The RFC-1 allows up to 80 time/date functions to be programmed by the user. These
functions are stored in non-volatile memory and remain intact if power is interrupted to the
RFC-1, even for extended periods of time. However, the clock/calendar itself does require
continuous power. It is a simple matter to reset the clock/calendar after a power outage but
if it were not discovered in time, one or more programmed events could be missed. For non-
critical applications, this problem can be lessened by programming the RFC-1 to
automatically make a call and report power failures upon power restoration. The operator
receiving the call can then reset the clock and calendar. For more critical applications, an
uninterruptable power supply is the best solution. This has the secondary advantage of
3.00.2
Installation
page 5.7

Sine Systems RFC-1/B Specifications

General

Brand	Sine Systems
Model	RFC-1/B
Category	Remote Control
Language	English