TP-Link RX-7-248 - Manual (Page 26)

The trim control changes the negative feedback volume, so that the gain of the head amp can
also be changed. THIS FUNCTIONS TO YIELD THE BEST COMBINATION OF MAXIMUM
HEADROOM AND MINIMUM NOISE CHARACTERISTICS. The level indications
(—60dBm, —40dBm and —20dBm) of the input level switch are nominal levels when the trim
control is set at the "0" position.
Input level in conjunction with the Input Level switch and Trim control can be calculated
as follows.
*Input Level Switch & Trim Control
In accordance with the input signal level, the combination of the Input Level Switch and Trim
Control on each input module helps establish the input fader at an easy-operation position.
When the Peak level indicator (the red LED) remains on or flashes occasionally, fully attenuate
the trim control. If it still continues to flash, change the input level switch setting from "—60dB
to —40dB" or "—40dB to —20dB", and readjust the trim control.
(Fig. 17)
(Fig. 18)
Example 1
Input Level switch
Trim control
Example 2
Input Level switch
Trim Control
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