Lectrician
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Na - the signal is still passed, but there is a tiny loss. The isolated outlets litterally simply protect the amp from short circuit type faults.
Amps have built in protection to shut down on a fault on an output. In flats etc, it would be a pain if everyone lost TV because someone was trying to use a dodgy fly lead to connect the TV.
In saying this, many amps these days have 'isolated outputs', where only the output thats faulty shuts down. However, there are still many that will shut down completely, or simply be unable to work with a shorted output.
Go for non-isolated. That is what all domestic installs use.
An amp with four outputs will be far superior to an amp with a splitter in the loft, unless the splitter is powered. Ask if the masthead amp has a single or four outputs.
The masthead amps, and many loft amps fitted by aerial guys, run on 12v DC which is derived from one of the coax downleads (outputs). This is usually from the main TV location, and the powersupply that sends this 12v up the coax is placed in line with the coax at this point. This is far easier for aerial guys, as they do not need to mess with lecky in the loft. It can however be a pain when you move house - most people take the powers supply with them, thinking it is the booster. Then the next folk in the house have no TV reception! In away, I wish the aerial guys would fix the power supply to the wall or skirting atleast!
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