On 10/05/2021 02:15, williamwright wrote:
On 07/05/2021 18:15, ARW wrote:



Now how will the tv faceplate (or a socket) fit on an exterior wall in
the bedrooms?


I wonder how far from a straight line the wall will deviate across the
width of a wallplate?


Taking the tower as a circle with a diameter of 10m then a 146mm double
socket would have a maximum gap of 0.53mm - well within the IP4x.


--
Robin
reply-to address is (intended to be) valid

On 10/05/2021 02:10, williamwright wrote:
On 06/05/2021 21:10, NY wrote:
I remember we had a set of about 10 attenuators daisy-chained together
between the aerial lead from the wall socket and the one to the TV.

Because there's always some signal pick-up at the TV set itself, strong
attenuation could result in pre- or post-echo in the analogue days. If
the aerial was local to the TV set the result would be signal
cancellation in an unpredictable manner, and that is what happens with
DTT. If the aerial is remote, such as with a distribution system, you'd
see 'ghosts'. However, massive signal levels should appear at outlets on
a system. That's unless the tenant has climbed into the loft and
bypassed a high value tap-off unit!

Incidentally a lot of aerial installers short out braid to inner with
one or two strands rather than use an attenuator. Why? Because they're
stupid.

Bill

Before the most recent frequency changes I was changing my old group
C/D loft-mounted aerial for a log-periodic job and noticed that even
with no aerial at all I could still get a clean picture and sound
on the main HD channels (from Midhurst) with just the builders coax
running up from the lounge and lying loose in the loft.

On 10/05/2021 12:25, Robin wrote:
On 10/05/2021 02:15, williamwright wrote:
On 07/05/2021 18:15, ARW wrote:



Now how will the tv faceplate (or a socket) fit on an exterior wall
in the bedrooms?


I wonder how far from a straight line the wall will deviate across the
width of a wallplate?


Taking the tower as a circle with a diameter of 10m then a 146mm double
socket would have a maximum gap of 0.53mm - well within the IP4x.


Thank you.

Bill

On 10/05/2021 12:35, Andrew wrote:


Before the most recent frequency changes I was changing my old group
C/D loft-mounted aerial for a log-periodic job and noticed that even
with no aerial at all I could still get a clean picture and sound
on the main HD channels (from Midhurst) with just the builders coax
running up from the lounge and lying loose in the loft.

Yes, builder's coax receives signal and interference quite well!

Bill

On 10/05/2021 12:25, Robin wrote:
On 10/05/2021 02:15, williamwright wrote:
On 07/05/2021 18:15, ARW wrote:



Now how will the tv faceplate (or a socket) fit on an exterior wall
in the bedrooms?


I wonder how far from a straight line the wall will deviate across the
width of a wallplate?


Taking the tower as a circle with a diameter of 10m then a 146mm double
socket would have a maximum gap of 0.53mm - well within the IP4x.





So actually that's a smaller gap than on a Taylor Wimpey new build flat
wall:-)

Thanks for the calculations. Much appreciated.

I am on slow time this week with no access to a mobile phone or computer
in the day time.



--
Adam