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Monitors section ( by selecting Auto-PFL ). The PFL only operates when the fader is fully down,
unless jumper J11 is not fitted when the PFL will operate with the fader either up or down. PFL is
active when the Yellow LED is illuminated in the button.
The PFL button on the telco channel also switches the programme output and the
talkback bus to the cleanfeed output, so that the presenter can talk to the caller.
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The Hold button is used as the Remote Divert for the telephone hybrid unit. It also
controls the cleanfeed audio output in conjunction with the output A select button ( but not B ). When
both the output A and the Hold button are On, audio is enabled at the cleanfeed output. If either the
Hold button or output A are not selected, the cleanfeed output is muted.
In operation, this means that the presenter can talk in PFL mode with the caller by
pressing the Hold button. The presenter can then put the caller to air by pressing the A output button.
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The 100mm long throw ALPS VCA fader provides a unity gain ( 0dB ) when fully
open. The scale shows the attenuation. The fader open signal is produced by a voltage detecting op-
amp and is disabled when the fader is in the fully down position. The fader open signal can be used
for the fader start/timer functions. The channel input is routed to the outputs whenever the fader is
open and the output switch is selected.
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A white pad is provided at the bottom of the module on to which you can write the
function of the channel, for example, “Presenter’s Mic”.