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1.2.5 Transmitter
During off state, the transmitter is completely switched off, and as the
remote receiver does not contain a local oscillator, as would normally
be the case, when using a heterodyne receiver, everything is totally
quiet and nothing can be found by e.g. spectrum analyzers or scanners.
For minimum current consumption, analogue frequency modulation with
an audio bandwidth of (100 - 5000) Hz (unscrambled mode) has been
chosen.
1.2.6 Remote Control Receiver
The remote-receiver is realized by a very small and sensitive hybrid IC,
intended for unlicensed low-power remote control. The carrier
frequency is OOK (on off keyed) modulated and the system provides up
to 4096 different address codes. The Spectronic X-IDER remote-control
transmitter is used to send the different codes for setting up the TX.
The Address Code of the Remote Control is factory set, according to
customer specifications, or as specified for standard frequencies by
Spectronic.
