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8 Channel – Transmitter
Mode of Operation
The transmitter SHT-77 is able to transmit coded signals to a matched receiver via radio transmission.
The operation corresponding to these signals depends on the receiver and its wiring.
It should be noted that for applications that could put human life at risk, by using radio
connection there is always present a potential hazard due to extraneous disturbances.
It is forbidden to modify or change component parts of the product!
1 Description of Operation
The transmitter SHT-77 allows the user to transmit up to 8 different Signals to matched Series SH-7C
receivers. This could be 8 Signals to only one receiver (e.g. SHR-7 K4) or a number of receivers at
different locations.
SHT-77 has 7 Buttons, the eight´ Function is realised by simultaneously pressing key 3 and 6. This
special function is assigned for applications, not to be triggered by mistake or misuse.
A green flashing LED acts as a transmission indicator for each signal. In case the Battery reaches low
capacity, the yellow LED, marked with a battery-sign, flashes also. In addition the "Low-Batt."-status is
transmit to the receiver, where a separate Alarm or signal could be realised.
Operation of SHT-77 is permitted free of charge and without declaration in the area of the European
Community and Switzerland.
2 Range of operation
The system is designed for large operating range up to over 100 meters and even obstructing walls or
steel reinforced constructions can be penetrated.
The range may be reduced for the following reasons:
•
Buildings, vegetation or any other objects will substantially reduce the operating range.
•
The distance between the antenna and the human body or other conducting objects (e.g. Earth)
may influence the working range.
•
"Background electrical noise" could be relatively high so that the signal-to-noise-ratio decreases
and therewith the range.
Also other devices, with similar operating frequency, located within the neighbourhood may
disturb the receiver.
•
Operating the receiver next to inadequately shielded electronic boards or other devices (e.g.
PC's) that produce electromagnetic radiation, can substantially reduce the range of operation and
could result in an apparent intermittent operation.
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Operating Instructions (GB)
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