User Interface Options
3–6
Copyright © 2002 Harmonic Inc.
3.3
Front Panel RF Adjustment
NOTE:
Harmonic recommends that you use the front panel RF Adjustment
control only if the interface options described in Section 3.1 and
Section 3.2 are not available.
The PWRLink II transmitter front panel includes an RF adjustment control,
labeled
RF Adj
, as shown in Figure 1-1 on page 1-2. The RF adjustment
potentiometer provides screwdriver-adjustable control of the input signal
RF pad.
The RF pad adjustment potentiometer provides the following options:
•
Each clockwise turning step of the RF adjustment switch increases the
RF attenuation by 0.1 dB.
•
Each counterclockwise step of the switch decreases the RF attenuation
by 0.1 dB.
•
Each full turn has 10 steps, equal to 1.0 dB.
Note that the RF adjustment switch works by communicating with the
microprocessor, which in turn adjusts the pad value.
3.4
Front Panel LED Indicators
The PWRLink II transmitter front panel includes two LEDs, as shown in
Figure 1-1 on page 1-2.
•
The
Status
LED illuminates red if an alarm condition exists within the
transmitter, and for a short period during power up. The
Status
LED
illuminates green if no alarm condition exists and the transmitter is
operating normally.
One type of alarm condition is the
RF signal low
alarm. The
Status
LED
indicates an alarm (red) whenever the RF composite power level at the
input of the transmitter falls below 28 dBmV. If the level rises above the
28 dBmV threshold, the
Status
LED illuminates green.
•
The
Select
LED illuminates yellow when the transmitter module is selected
via the front panel controls of the HLP 4200WD.