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Which plugs Wire my house X-Ray Remote 304114 wall plate FAQs BLOG Contact Us		Inside a typical Sky Digibox Rear Connections Measuring LNB Voltage Rear connections on a typical Sky+HD Digibox. Connect TV aerial cable to "Aerial In". Its Freeview signals (digital) will be combined with the selected Sky programme (analogue) which come out of both RF Out sockets. More connections. The LNB cables should be connected to the "Dish Input" sockets, using 'F' plugs. How to measure the LNB voltage   Cut a piece of copper wire from a length of coaxial cable. Make a point at one end and push it a short way (4 mm) into the threaded tuner connector. Or simply use a pin! (Use pliers - if you use your thumb you'll inject yourself!) Set your multimeter to the 20 volt DC range (or higher). Connect + probe (red) of multimeter to this copper wire. Connect - probe (black) of multimeter to the threaded portion or to the outer part of the adjacent aerial socket. The meter should indicate approximately 13 volts (V) and 18 volts (H) when a vertically- or horizontally-polarised channel is selected, respectively. Please note that voltages may read slightly high because this is a "no load" test. You can use a 75 Ohm 5 Watt resistor as a load (or connect an LNB). For the purpose of voltage measurement, the LNB does not need to be connected with coaxial cable. See "How to Use a Multimeter" and Where to buy a multimeter? See "A Beginner's Guide to Receiver Repair" See Capacitor failure