Digital Clamp Meter
If I’ve got 30 meters of 75Ω coaxial cable connected to an aerial, what impedance would my meter read when?
The reason I ask this is because I couldn’t pick up all the digital channels on my freeview box, the cables between TV and freeview box were all good, as were the connections. Next step was to have a look at the aerial wall socket.
On removal of the aerial socket, I noticed that the copper core was as it should be, but the clamp securing the screen to the socket had come away. With both ends terminated correctly and my freeview box re-tuned, I found that there were only 12 channels available to me, whereas before there were at least 40.
When I measured the impedance between conductor and screen I found that I had 770Ω. I disconnected the screen from the aerial socket, re-connected my freeview box and re-tuned. The channels available went up to 70. I should be able to receive somewhere in the region of 90.
I live in a block of six flats so running in new coaxial cable is not an option…be grateful of any advice…
Ta very much
http://www.satcure.co.uk/tech/freeview_problems.htm
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