LNB remote power supply should not be (DC at RF IN) – Damaged PTC

If your instrument does not provide any more remote power supply to TV mast amplifier, check the following points.

a) Check if the switch “DC@RF IN”, available in most models, is set to ON: see examples figures 1 and 2.

  • NOTE: Must be set to OFF when used in CATV networks live;

b) Ensure that the YELLOW LED “DC@RF IN” on the front panel of the instrument lights on;
c) Activate in the measure MENU, the power supply voltage by selecting in the “DC@RF” the desired voltage value: 5/12/18 or 24 VDC (see example Figure 3);

Figure 1: DC@RF IN switch example Figure 1: DC@RF IN switch example Figure 3: Selection
of remote power supply DC@RF IN example

d) If the LED lights up, but after a few seconds that you connected the MAST-AMPLIFIER, the instrument does NOT provide any more voltage (the spectrum of the received signals decreases sharply or measures are interrupted), check:

  • If there is an overload or a short circuit in the installation;
  • While, if the instrument is more than 2 or 3 years old, due to many and long short circuits at RF input (DC@RF IN), may be deteriorated the protection (PTC).

In this case, the instrument must be sent to ROVER for repair (NOT covered by warranty).

Figure 4: PTC example (60 Volt, 650 mA, 0,31 Ohm)

IMPORTANT: For safety reasons, the power supply voltage (only in TV and CATV), SWITCH OFF automatically when changing function (eg HOME, SAT, PLAN) or when power is turned OFF.