Monday, 7 April 2014

Terrestrial TV - Stage 2

Being in the Gorge itself is a bit of a problem, as there's no line of sight to the transmitter on the Wrekin, which is the local main broadcast point for digital TV and radio. However we're not alone in this situation, so there is a re-broadcast mast in the Gorge, which we do have sight of from the house. It is likely to have a reduced service, maybe only the core 3 TV MUXes rather than the full set of 6 that the Wrekin broadcasts. But we should get a good signal, being only 500 metres from the mast.

First thing to do was put up a pole to mount the antennae on. I used a pair of T and K brackets to get a 20cm standoff from the workshop wall, and mounted a 180cm pole of 3.75cm diameter and 16 gauge alloy. At the top I've put a Wolsey HG5 T-group (wideband) Yagi antenna for TV. I've also put up a Triax FM omni antenna, and a Triax DAB dipole antenna. The three antenna feeds are combined in a masthead triplexer, and then connected to the terrestrial input of the multiswitch.

Each output of the multiswitch is now carrying FM at 87Mhz to 108Mhz, DAB at 217Mhz to 240Mhz, terrestrial TV at 474MHz to 786MHz, and satellite IF at 950Mhz to 2150Mhz. So by using screened quad-outlets in the house I'll have FM and DAB on one socket, TV on another, and 2 satellite feeds (for twin-tuner recorders).

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