Digger wrote:bunyip wrote:you can also amplify a tv signal providing it is retransmitted on the same frequency.
To reduce the risk of interfernce you can change the transmitting antennas polarity, can drop by up to about 30 dbuv, change receiveer as well so their is no swamping.
In the last 12 months we had a mobile tower installed just 400 metres from the house and after a while we started experiencing massive break up of free to air TV signals.
It occurred to me after a while that the events were at about the same time so I called a TV antenna bloke in and apparently my 20 year old mast head amp was amplifying across those same frequencies and causing the interference. A new narrower range amp fixed the problem. I though at that distance it might have been front end overload but not so fortunately.
We certainly love having mobiles that work at home now....Grin~
(Many thanks to our local member Darren Chester)
An electrical store in the western district was having problems with reception, he had about 10 TV's in the shop and they simply were not working.
Pulled out the spectrum analyser and nearly melted it, he had a mast head amp which was putting out anout 60db but on the south side of a 12 way splitter he lost about 20 db so he stuck in an inline amp, that worked and boosted the signal pre splitter to about 160db.
We turned it down to about 90db and let the splitter do the rset, I was surprised that the front end overload didn,t destroy the sets.
Bigger is not always better.
I was going to offer drop taps but hated to think how he could bugger that up.