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This manual is divided into two sections. The first is a description of the system hardware. The
second covers the recommended operating and maintenance procedure.
1.0
HARDWARE DESCRIPTION.
The model RFLS-MK3HSXT Fixed Channel High Speed UHF Transmitter with
sequential acoustic trigger is a low power six channel, safety locking, hand-held remote
control transmitter which can transmit commands over any of six different digital
channels. The transmitter's channel setting is fixed in software and cannot be changed.
A label displaying the channel setting is affixed to the top of the transmitter next to the
antenna. Transmitters fixed to separate digital channel numbers can transmit
simultaneously without interfering with each other. This permits up to six different
receivers or groups of receivers to be controlled by separate transmitters
simultaneously. The transmitter will only actuate receivers whose digital channel
switches are set to select the same channel as the transmitter. Thus, multiple
transmitters may be used to actuate different selected receivers even though all operate
on the same frequency. Transmitters fixed to the same digital channel number will
interfere with each other and result in failure-to-fire when actuated simultaneously.
When used with RFLS-96HSRC, RFLS-496HSRC, or RFLS-912HSRC receivers, a
range of ½ mile can be achieved. All inscriptions on the transmitter panel are
luminescent to facilitate use of the transmitter in a dark environment. The panel will
continue to glow for two to three hours after being exposed to a bright light source. The
transmitter's two commands are digitally encoded and amplitude modulated on a single
carrier frequency of 418 MHz (or optionally 433.96 MHz). This frequency is controlled by
a SAW (surface acoustic wave) device for exceptional stability. No alignment or tuning
procedures are ever required to maintain optimum performance. The command signal is
transmitted by amplitude modulating the carrier to indicate to the receiver which of the
transmit buttons is depressed or whether an acoustic event has been detected.
In acoustic trigger mode (digital switch positions 0 – B), the "A command" signal (semi-
automatic fire) is transmitted for 250 msec when an acoustic impulse exceeding the
selected threshold is detected by the rear panel microphone while the "Fire A / Enable B"
button is depressed, and it is transmitted continuously while the "B" button and "A"
button are depressed simultaneously, permitting the "B" button to serve as an acoustic
event simulator.
In normal command mode (digital switch positions C – F), the modulated RF output
occurs continuously while either of the two transmit buttons is depressed. Resulting
receiver output is continuous while the "A command" signal (semi-automatic fire) is being
transmitted, and the receiver fires outputs in rapid-fire mode at a rate selected by the
transmitter's FIRE RATE SELECTION SWITCH while the "B command" signal is being
transmitted.
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