How Old Is Your TV Cabling?
When I started my apprenticeship back in 1980 the cable we used to install TV outlets was a brown, air filled coax which had little in the way of shielding. Shielding is like a wrapping of wires which are around the main centre conductor. This was cutting edge cable for those times when the signals were in the VHF band.
Fast Forward to 2016…. Today in our area of the North Coast of N.S.W and South East Queensland the TV signals are UHF which is higher up the frequency scale.
What this means is that the old cable loses a huge amount of signal (also known as attenuation )when used for UHF. In terms of a hose carrying water….it leaks like a siv. Not only does it leak like a siv, it can also let in signals from other sources like your power cables or 2-Way radio or mobile phone transmission.
This translates into interference which you may experience in the form of pixilation on your TV screen.
I say ‘may’ because it is not a definite thing.
When I am called to fix TV reception issues I like to start from the top. Meaning I want there to be the best signal coming in from the antenna so i can then work out logically where the problem may be in your TV Antenna System.
Most of the time by replacing key parts I can solve the problem but sometimes I solve most of them and then the last thing is to rewire the system which basically upgrades most all parts to ‘digital ready’ which is always a better thing to do to reduce possible problems now and in the future.