Re: 'The antenna cable must be earthed.'

Wire from LNB entering a building must first drop down to be earthed
before it enters the building. It must be earthed to the same
electrode used by AC electric. This because lightning transients
(surges) occur typically once every eight years and because that damage
is so easily eliminated by earthing that coax cable.

That would be one incoming path to damage electronics. Any wire
inside any cable (overhead or underground) can carry a destructive
transient into a building. Therefore simple and so inexpensive
protection means each wire is earthed (less than 3 meters) either by
hardwire connection (ie that satellite dish coax cable) or via a 'whole
house' protector.

Many jurisdictions also require the dish be earthed.

Effective protection is that simple. So well proven that electronics
damage is directly traceable to human failure. Earthing provides surge
protection which is why a manufacturer wold demand it. Earthing is so
well understood and so common for decades that many don't even bother
to detail what is required.

Alan Pemberton wrote:
Just spotted in a satellite receiver user guide that 'the antenna cable
must be earthed'. It's unclear whether this refers to the IF cable from
the LNB or the through-connected terrestrial feeder to the telly, or
both, but it's a condition unlikely to be met in the average domestic
installation isn't it?

.

Relevant Pages

  • Re: http://h71000.www7.hp.com/?
    ... overwhelmed protection already inside appliances, ... It's my understanding,, that lightening doesn't travel inside a wire, it rides on the outside. ... it would be through a low-pass filter with the cutoff well ... It's been 31 years since I studied electronics, ...
    (comp.os.vms)
  • Re: Lightning protection AND putting a receptacle on UPS
    ... To define hot spots and protection, ... That is your first layer of protection. ... inside electronics may be thought of as the third layer. ... ground wire being too long and not separated from other wires. ...
    (alt.home.repair)
  • Re: REMOVING ENAMEL COATING
    ... product displays and stocks at NON-ham electronics stores. ... wire has ALWAYS been the same to this day. ... Amateurs who are in the know use solder ... this "Southgate Radio" you keep mentioning doesn't ...
    (rec.radio.amateur.homebrew)
  • Re: Power supplies keep crapping out on me
    ... Few components in an Apple II power supply are custom.Inspection ... Damage from lightning is an electrical path from cloud to earth. ... electronics, through thermocouple, and to earth ground via fermenter. ... protection unless you have installed a 'whole house' protector AND have ...
    (comp.sys.apple2)
  • Re: Brown out protection.
    ... Brownouts do not cause electronics damage. ... they saw the brownout but failed to see a reason for that brownout - ... disconnect from a surge fast enough. ... Those who recommend a UPS for surge protection often do ...
    (sci.electronics.basics)