Customer has asked me to run an extension to their TV Aerial cable. Not
digital, just the normal aerial on the roof.
Cable run will be 15 metres. Is that going to work, or will they need
some sort of signal booster?
Dave - The Medway Handyman www.medwayhandyman.co.uk
Digital *is* normal these days, not that it makes much difference to the
aerial, other than letting you get away with more.
If it works OK now without a booster, chances are good it'll work with
the extension, probably worth a quick check of various channels
beforehand (see if the TV has a strength/quality display) so you don't
get any "it was ok before you touched it" comeback (you presumably don't
have the equipment to measure signal strengths).
Use decent cable (make sure it's copper with braid and foil screen) join
with F plugs+barrel if you can (toolsatan doesn't sell the latter, but
On Friday, 27 June 2014 08:42:46 UTC+1, Andy Burns wrote:
I *presume* TMH means "normal aerial co-ax, not ethernet cable for a computer
(/me sits back and waits for the version of the Yorkshiremen sketch where
people talk about using thin and thick co-ax for computer networks.)
On Friday, June 27, 2014 7:41:32 PM UTC+1, The Medway Handyman wrote:
If the signal is strong, then a passive splitter might work - especially if the signal has already been amplified by a loft or masthead amp.
If not then you'll need a 2-output amp with the existing TV and the extension on separate outputs. Such are available at Argos (and can be taken back if not satisfactory, but in terms of cost per hour it may be better to buy something better to start with)
On 27/06/14 19:56, firstname.lastname@example.org wrote:
I've just daisy chained - mind you I have a dist amp feeding it.
sometimes the reflections are not in any band you care about. Worth a
try with a bit of cable before going mad trying to be too prissy about
(in-ep-toc’-ra-cy) – a system of government where the least capable to
May I suggest this site for a bit of background:
http://www.aerialsandtv.com/ I found it very informative and some of it
quite amusing. So much so I've bought two aerials from them in the past
couple years despite being in Surrey.
Use a a proper 12V distribution amplifier.
Check the signal strength first at their TV using the relevant menu
option.If it's a modern Freeview TV there will be an option.
If the signal strength shows as 80% or better then OK but if any of the
MUX's (channels) are low or droping out, fix that first.
Chances are that the old aerial is 40+ years old and pointing at the
wrong transmitter and that the aerial lead is similarly cream crackered.
15m of almost any decent UHF TV coax will have a loss of (say) 3dB.
If the customer used get a reasonable analogue picture, presumably they
are having absolutely no problems with your new-fangled digital.
Digital usually gives you perfect pictures with a signal quality quite a
lot worse than you'd be happy with for analogue. In particular, it
typically works down to a much lower signal level (at least 15dB lower),
so even with the additional 3dB loss, it'll probably be fine. However,
before doing anything permanent, you could always simply try adding a
15m lump of coax to the end of the existing coax.
If the customer is likely to want to have the option of using a
TV at either end of the extension, it would be more professional to
connect the extension permanently to the existing coax via a proper
2-way splitter. This will lose you another 4dB, making a total of 7dB at
the far end of the extension. But again, you'll probably get away with
it (and again it's easy to try out before doing the installation). If
the signal does seem to be too low, you could try a low-gain 2-output
amplifier instead of the splitter.
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