I have come across a problem today splitting a TV Aerial, I have split many
TV Ariels in the past without a problem until today. I took the fitting
from the back of the TV and put it into a 2 way Y splitter and then added
another Aerial to the splitter also but then I had no signal at all so I
thought maybe the splitter is duff so I simply joined the wires instead as I
have done many times previously with no problems and still no signal at all
which has intrigued me somewhat. The only way I can get the TV to work is
by fitting the Aerial directly into the back of the TV, if I try joining the
wires or using a splitter I get no signal at all. I have also tried one of
those in line joiner pieces and no signal there still. Why havent I got a
signal if I simply join the wires as I have with my own tv's in the loft
where I have 4 tv's working without a problem?
All I can say is you are very lucky to have enough signal to join 4 seperate
Tvs to one aerial feed and have them working without some sort of matching
device or an amplifier. When you put a signal into a Y splitter you loose
50% of it in voltage terms, even more in terms of power. If you just join 2
aerial feed wires together without some sort of matching device you loose
50% in terms of voltage and you can loose much more by reflected signals,
depending on the lengths of the cables.
Is the TV signal you are trying to use for digital TV? Is the location of
your poor signal the same as your home location? I don't understand your
total lack of signal when you connect splitters or aerial unless you are
viewing digital TV. I suggest you try a multiway amplifier as close to the
aerial as possible.
The signal to the main tv is for digital and I'm trying to get a signal for
the analogue one but when I split the wire from the aerial I'm not getting a
signal at all not even on the analogue one. If I split the wire of the main
tv and don't connect the other tv to it at all and simply put an in line
connector as if to join 2 halves of the cable together I still can't get a
signal, I have to have the connector directly on the end of the cable with
no breaks for a decent picture.
I would have thought that a masthead amp with coax fed power supply would
isolate the dc side from the downlead to the TV so there should be no
interaction though I suppose the PSU could have a fault and be putting its
dc onto the downlead.
I would like to know what you mean by no signal, do you get a faint noisy
picture on analogue and a blue screen on digital, or are you measuring the
signal strength? Does the loft you talk about use the same aerial as the
one you are trying to fix?
Are you sure that when you join the coax that there isn't the odd strand of
wire shorting the connection. Similarly are you sure your splitter and
connections to your last coax plug are OK?
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