Dish earth?

Hi

I have fitted a satellite dish for Freesat which is working fine.
I did notice that there is provision for an earth connection to
the dish but looking at local Sky fitted dishes they don't seem
to bother to earth them.

Should I bother to earth mine?

Trevor

Trevor wrote:
Hi

I have fitted a satellite dish for Freesat which is working fine.
I did notice that there is provision for an earth connection to
the dish but looking at local Sky fitted dishes they don't seem
to bother to earth them.

Should I bother to earth mine?

Trevor

I've never seen one that is earthed.

"Adrian" wrote in message
om...
Trevor wrote:
Hi

I have fitted a satellite dish for Freesat which is working fine.
I did notice that there is provision for an earth connection to
the dish but looking at local Sky fitted dishes they don't seem
to bother to earth them.

Should I bother to earth mine?

Trevor

I've never seen one that is earthed.

I'm probably showing my ignorance here (having just returned form a very
convivial hour or two in the local hostelry), but if the dish is earthed
surely all the (minute) RF that it collects from the satellite will be
diverted to earth rather than reflected to the LNB - thus effectively
defeating the entire point of a reflective collector?

Cheers

Chas

"Chas Gill" wrote in message
...

"Adrian" wrote in message
om...
Trevor wrote:
Hi

I have fitted a satellite dish for Freesat which is working fine.
I did notice that there is provision for an earth connection to
the dish but looking at local Sky fitted dishes they don't seem
to bother to earth them.

Should I bother to earth mine?

Trevor

I've never seen one that is earthed.

I'm probably showing my ignorance here (having just returned form a very
convivial hour or two in the local hostelry), but if the dish is earthed
surely all the (minute) RF that it collects from the satellite will be
diverted to earth rather than reflected to the LNB - thus effectively
defeating the entire point of a reflective collector?

No no.
They don't even need to be electrically conductive.
http://www.satellitesuperstore.com/clearmenu.htm

--
Graham.

%Profound_observation%

"Graham." wrote in message
...


"Chas Gill" wrote in message
...

"Adrian" wrote in message
om...
Trevor wrote:
Hi

I have fitted a satellite dish for Freesat which is working fine.
I did notice that there is provision for an earth connection to
the dish but looking at local Sky fitted dishes they don't seem
to bother to earth them.

Should I bother to earth mine?

Trevor

I've never seen one that is earthed.

I'm probably showing my ignorance here (having just returned form a very
convivial hour or two in the local hostelry), but if the dish is earthed
surely all the (minute) RF that it collects from the satellite will be
diverted to earth rather than reflected to the LNB - thus effectively
defeating the entire point of a reflective collector?

No no.
They don't even need to be electrically conductive.
http://www.satellitesuperstore.com/clearmenu.htm

--
Graham.

%Profound_observation%


Oh yes they do - conduction is part of the reflection process - transparent
does not mean non-conductive.

Trevor wrote:
Hi

I have fitted a satellite dish for Freesat which is working fine. I did
notice that there is provision for an earth connection to the dish but
looking at local Sky fitted dishes they don't seem to bother to earth them.

Should I bother to earth mine?

Trevor



are we talking like lightening rod here?

andrew

Earthing is required when multi output LNBs feed different properties.
Adjacent properties may be on different mains phases and if the insulation
breaks down on a STB in one house it could find it's way through to the
other houses connected to it.



"Trevor" wrote in message
...
Hi

I have fitted a satellite dish for Freesat which is working fine. I did
notice that there is provision for an earth connection to the dish but
looking at local Sky fitted dishes they don't seem to bother to earth
them.

Should I bother to earth mine?

Trevor

"amp is" wrote in message
...
Earthing is required when multi output LNBs feed different properties.
Adjacent properties may be on different mains phases and if the insulation
breaks down on a STB in one house it could find it's way through to the
other houses connected to it.


Isn't that requirement for the cable outer (and consequently the LNB?
When do the dish and bracketry require earthing?

--
Graham.

%Profound_observation%

"amp is" wrote in message
...
Earthing is required when multi output LNBs feed different properties.
Adjacent properties may be on different mains phases and if the insulation
breaks down on a STB in one house it could find it's way through to the
other houses connected to it.



Well it is more exciting than that because often boxes are isolated and the
chassis (and cable shield) drift up to about 120V AC. Not a lot of current,
but a worrying tingle when you are forty foot up and not following the
"working at heights directive" 100% (or even if you are I suspect).


"Trevor" wrote in message
...
Hi

I have fitted a satellite dish for Freesat which is working fine. I did
notice that there is provision for an earth connection to the dish but
looking at local Sky fitted dishes they don't seem to bother to earth
them.

Should I bother to earth mine?

Trevor

Trevor wrote:
Hi

I have fitted a satellite dish for Freesat which is working fine.
I did notice that there is provision for an earth connection to
the dish but looking at local Sky fitted dishes they don't seem
to bother to earth them.

Should I bother to earth mine?

Trevor

I've never seen one that is earthed.

I'm probably showing my ignorance here (having just returned form a very
convivial hour or two in the local hostelry), but if the dish is earthed
surely all the (minute) RF that it collects from the satellite will be
diverted to earth rather than reflected to the LNB - thus effectively
defeating the entire point of a reflective collector?

No no.
They don't even need to be electrically conductive.
http://www.satellitesuperstore.com/clearmenu.htm

--
Graham.

%Profound_observation%


Oh yes they do - conduction is part of the reflection process -
transparent does not mean non-conductive.

I am sure you are right in the sense that a material may be conductive on
the molecular level and be a total insulator for practical purpose of
passing any current.


--
Graham.

%Profound_observation%