Zeck d.a.i.sy DS 800 UHF Manuel D'utilisation page 26

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2.6 „RF" indicator LED (11)
This LED signalizes that the receiver is detecting an r.f. carrier
signal. This carrier signal is radiated by the transmitter, no
matter if an audio signal is applied or not. If this LED is lit
although the transmitter is turned off, the receiver is picking
up r.f. stray signals, which are mostly produced by digital
devices, such as keyboards or effect units. In this case, the
receiver has to be re-positioned away from the interfering devices
until the „RF" LED remains dark when the transmitter is turned off.
2.7 Channel selector switch (23)
This rotary switch is used to select one of the 16 available UHF
channels for the transmission between transmitter and receiver.
The 16 channels are numbered from '0' to 'F'. The actual
frequencies for each selected channel are listed in the
'Technical specifications' chapter.
The transmitter is equipped with the same type of switch (8). A
wireless transmission is only possible when both transmitter and
receiver are working with identical carrier frequencies. This is provided when
both both channel selector switches (23) and (8) are set to the same position.
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