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Posted by atec on 01/31/07 00:21
Alan wrote:
> In article <epmd35$eke$1@news-01.bur.connect.com.au> "Clubsprint" <spamspamspamspam@nospam.com> writes:
>> G'day all
>> Went and bought a Conia set top box over the christams break and it's
>> exposed a problem with my
>> AV setup that I need some help with. I also bought and installed a new
>> antenna (Hills 400).
>> TV is an 80cm Sony WEGA and DVD/HD recorder is a Pioneer.
>> These get power from a monster cable powerpack (next to useless)
>> The problem I have is when watching TV I get diagonal interference lines
>> across the screen.
>> With the Ant. direct to TV no problem. Insert the Pioneer and slight problem
>> on some stations.
>> Plug the Conia set top box into the power and the problem goes ballistic and
>> TV is unwatchable
>> on analoge. Gets worse when the Conia is in the RF path. Digital from the
>> Conia works
>> perfect (about 45% signal) but if I want to record the digital and watch TV
>> is a huge issue..
>> I returned the Conia box to the shop but worked perfect when we plugged it
>> in there.
>> With or without the monster cable powerpack the result is the same.
>> I noticed some voltage in the leads (tingled my fingers) so I think I may
>> have an earth problem
>> in the house or the AV setup. The TV has an earth pin on it's power lead,
>> nothing else has.
>> Can anyone please give me some clues as to how to go about
>> diagnosing/solving the problem?
>> Regards
>> Mark
>
>
> The diagonal lines are most likely interference from the set top
> box's switching power supply.
>
> The monster is basically useless, as it is passing the switching
> noise from the STB through, though a lot is probably coming from
> the STB line cord.
>
> Alan
I wonder if both devices are connected from the same powerpoint , if so
then moving one to another point may cure it if isolation between the
phase elements in the supplies is a problem .
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