Interference from digital set top box

M

Mac

Guest
Hi All,

As some of you may know I had a high noise level which appeared intermittant
at first then solid.
Of recent times it has been a solid S9 on 80mx and S8 on 40mx day and
night.I guess the intermittant
part was the 11kv power lines out the front so one would think that will
continue from time to time.
In the finish, I tracked the solid interference down to a standard
definition set top digital TV box which was
in idle mode 24/7. Even when I disconnected the TV aerial leads (in/out) it
didn't change. I tried winding
the power lead on a ferrite bar and eventually the TV coax but no effect.
The plug pack is not a switching supply
either. It just plain seems the plastic cased unit radiates broadband
interference and doesn't need an aerial either.

The brand is a "KROSS" Model "DSK530STB" and I would be interested if the
same problem is noted with other
brands or models.

My noise level has dropped to S4-5 80mx (daytime) and S2-3 40mx. Big
difference to my ears.

Would be a shame if one of my neighbours bought one!!!!

73 de Peter

----------------------------------------------------------------------------------
Mid North Coast Amateur Radio Group Inc.
Coffs Harbour And District Amateur Radio Club Inc.
CW Operator's QRP Club Inc. No. #563
Wireless Institute Of Australia.
International Fox Tango Club.
----------------------------------------------------------------------------------
 
On Thu, 30 Aug 2007 15:12:44 +1000, "Mac" <vk2evb@hotmail.com> wrote:

Hi All,

As some of you may know I had a high noise level which appeared intermittant
at first then solid.
Of recent times it has been a solid S9 on 80mx and S8 on 40mx day and
night.I guess the intermittant
part was the 11kv power lines out the front so one would think that will
continue from time to time.
In the finish, I tracked the solid interference down to a standard
definition set top digital TV box which was
in idle mode 24/7. Even when I disconnected the TV aerial leads (in/out) it
didn't change. I tried winding
the power lead on a ferrite bar and eventually the TV coax but no effect.
The plug pack is not a switching supply
either. It just plain seems the plastic cased unit radiates broadband
interference and doesn't need an aerial either.

The brand is a "KROSS" Model "DSK530STB" and I would be interested if the
same problem is noted with other
brands or models.

My noise level has dropped to S4-5 80mx (daytime) and S2-3 40mx. Big
difference to my ears.

Would be a shame if one of my neighbours bought one!!!!

73 de Peter

----------------------------------------------------------------------------------
Mid North Coast Amateur Radio Group Inc.
Coffs Harbour And District Amateur Radio Club Inc.
CW Operator's QRP Club Inc. No. #563
Wireless Institute Of Australia.
International Fox Tango Club.
----------------------------------------------------------------------------------
Click to expand...
Does it have a C Tick? Maybe it would not have it through the approval
if it was actually tested.
 
It costs too much to have C tick compliance, that would eat into the profits
on their 10 containers of the spugie emitting ebay rubbish.
Build a faraday cage for it.

Rob


Does it have a C Tick? Maybe it would not have it through the approval
if it was actually tested.
Click to expand...
 
Ah, it's the law.....

it also reduces the lawsuits if it has a potential fire danger...


On Fri, 31 Aug 2007 17:08:55 +1000, <R1rob> wrote:

It costs too much to have C tick compliance, that would eat into the profits
on their 10 containers of the spugie emitting ebay rubbish.
Build a faraday cage for it.

Rob



Does it have a C Tick? Maybe it would not have it through the approval
if it was actually tested.
Click to expand...
 
Hello chaps,

This Kross STB was purchased from Woolworth Supermarket, Park Avenue Coffs
Harbour an is supposed to be
complient with Australian regulations.

Cya Mac

"sb" <other-news@usa.net> wrote in message
news:puafd311n4b9dcg0fns87n5l8r45ivet4f@4ax.com...
On Thu, 30 Aug 2007 15:12:44 +1000, "Mac" <vk2evb@hotmail.com> wrote:

Hi All,

As some of you may know I had a high noise level which appeared
intermittant
at first then solid.
Of recent times it has been a solid S9 on 80mx and S8 on 40mx day and
night.I guess the intermittant
part was the 11kv power lines out the front so one would think that will
continue from time to time.
In the finish, I tracked the solid interference down to a standard
definition set top digital TV box which was
in idle mode 24/7. Even when I disconnected the TV aerial leads (in/out)
it
didn't change. I tried winding
the power lead on a ferrite bar and eventually the TV coax but no effect.
The plug pack is not a switching supply
either. It just plain seems the plastic cased unit radiates broadband
interference and doesn't need an aerial either.

The brand is a "KROSS" Model "DSK530STB" and I would be interested if the
same problem is noted with other
brands or models.

My noise level has dropped to S4-5 80mx (daytime) and S2-3 40mx. Big
difference to my ears.

Would be a shame if one of my neighbours bought one!!!!

73 de Peter

----------------------------------------------------------------------------------
Mid North Coast Amateur Radio Group Inc.
Coffs Harbour And District Amateur Radio Club Inc.
CW Operator's QRP Club Inc. No. #563
Wireless Institute Of Australia.
International Fox Tango Club.
----------------------------------------------------------------------------------


Does it have a C Tick? Maybe it would not have it through the approval
if it was actually tested.
Click to expand...
 
"Mac" <vk2evb@hotmail.com> wrote in message
news:46d8dd18$1_9@news.peopletelecom.com.au...
This Kross STB was purchased from Woolworth Supermarket, Park Avenue Coffs
Harbour an is supposed to be
complient with Australian regulations.
Click to expand...
And the key word is "supposed", until some one complains very loudly indeed,
the authorities do not check that actual shipments comply with any
regulations.
Until companies are comprehensively fined, it is usually cheaper for them to
ignore such regulations.

MrT.
 
On Sun, 2 Sep 2007 18:40:29 +1000, "Mr.T" <MrT@home> wrote:

"Mac" <vk2evb@hotmail.com> wrote in message
news:46d8dd18$1_9@news.peopletelecom.com.au...
This Kross STB was purchased from Woolworth Supermarket, Park Avenue Coffs
Harbour an is supposed to be
complient with Australian regulations.

And the key word is "supposed", until some one complains very loudly indeed,
the authorities do not check that actual shipments comply with any
regulations.
Until companies are comprehensively fined, it is usually cheaper for them to
ignore such regulations.

MrT.
Click to expand...
That would explain the same C tick registration numbers on different
products....
 
"sb" <other-news@usa.net> wrote in message
news:np1ld3drfhshgns43t6ljfumpeocghplci@4ax.com...
On Sun, 2 Sep 2007 18:40:29 +1000, "Mr.T" <MrT@home> wrote:


"Mac" <vk2evb@hotmail.com> wrote in message
news:46d8dd18$1_9@news.peopletelecom.com.au...
This Kross STB was purchased from Woolworth Supermarket, Park Avenue
Coffs
Harbour an is supposed to be
complient with Australian regulations.

And the key word is "supposed", until some one complains very loudly
indeed,
the authorities do not check that actual shipments comply with any
regulations.
Until companies are comprehensively fined, it is usually cheaper for them
to
ignore such regulations.

MrT.


That would explain the same C tick registration numbers on different
products....
Click to expand...
It depends on who holds the registration - many devices are identical but
simply "badge-engineered" for different suppliers.

The required response is clear:

1. contact the supplier and make noises about interference, suspected
non-compliance etc,

2. contact the ACMA area office, lodge a formal complaint (make noises
about suspect non-compliance or suspect labelling) - either pay your $60 or
get your neighbours to also complain.

Keith G Malcolm
VK1ZKM
3 September 2007
 
A C-tick number (correctly known as Supplier Code Number) relates to the
Australian supplier (i.e. importer or distributor), not the product.

This means you see:

1. the same product from different suppliers but with different supplier
code numbers,

OR

2. different products all from the same supplier with the same supplier
code.

sb wrote:
That would explain the same C tick registration numbers on different
products....
Click to expand...
 
"Mac" <vk2evb@hotmail.com> wrote in message
news:46d651c9_4@news.peopletelecom.com.au...
Hi All,

As some of you may know I had a high noise level which appeared
intermittant at first then solid.

The plug pack is not a switching supply
either. It just plain seems the plastic cased unit radiates broadband
interference and doesn't need an aerial either.

The brand is a "KROSS" Model "DSK530STB" and I would be interested if the
same problem is noted with other
brands or models.
Click to expand...
Hey Mac, are you sure the plug pack is not a switchmode PSU? The broadband
radiation you describe would seem to be more likely to eminate from a faulty
switchmode. I had a Kross STB, but I gave it to my Mum when the Thompson
unit she had suffered a failed PSU, which radiated in a similar way that you
described. She couldn't pick up any AM radio due to the interference.
Unplugging the Thompson fixed it.

I recall that the PSU on the Kross was very lightweight, so I assumed it to
be a switchmode. I didn't crack it open to find out though :)

I eventually hooked up a conventional 12v DC regulated transformer wall wart
to the Thompson, and it now works, although it does need to be unplugged
every now and then when it locks up.

The Kross is still going OK. I recall that it used to squeel and break up
when a certain light switch was turned on or off. I reduced the affect by
winding the power lead onto a ferrite core.


WR
 
Oh Bugger!!! it was a switch mode plug pack supply and thats where all the
hash came from. Used a linear supply and all clear.

Cya Peter


"Mac" <vk2evb@hotmail.com> wrote in message
news:46d651c9_4@news.peopletelecom.com.au...
Hi All,

As some of you may know I had a high noise level which appeared
intermittant at first then solid.
Of recent times it has been a solid S9 on 80mx and S8 on 40mx day and
night.I guess the intermittant
part was the 11kv power lines out the front so one would think that will
continue from time to time.
In the finish, I tracked the solid interference down to a standard
definition set top digital TV box which was
in idle mode 24/7. Even when I disconnected the TV aerial leads (in/out)
it didn't change. I tried winding
the power lead on a ferrite bar and eventually the TV coax but no effect.
The plug pack is not a switching supply
either. It just plain seems the plastic cased unit radiates broadband
interference and doesn't need an aerial either.

The brand is a "KROSS" Model "DSK530STB" and I would be interested if the
same problem is noted with other
brands or models.

My noise level has dropped to S4-5 80mx (daytime) and S2-3 40mx. Big
difference to my ears.

Would be a shame if one of my neighbours bought one!!!!

73 de Peter

----------------------------------------------------------------------------------
Mid North Coast Amateur Radio Group Inc.
Coffs Harbour And District Amateur Radio Club Inc.
CW Operator's QRP Club Inc. No. #563
Wireless Institute Of Australia.
International Fox Tango Club.
----------------------------------------------------------------------------------
Click to expand...
 
Mac wrote:
Oh Bugger!!! it was a switch mode plug pack supply and thats where all the
hash came from. Used a linear supply and all clear.

Cya Peter


I got caught out too with a switch mode from Jaycar, noise o plenty!
Click to expand...
 
"Mac" <vk2evb@hotmail.com> wrote in message
news:46e28941_8@news.peopletelecom.com.au...
Oh Bugger!!! it was a switch mode plug pack supply and thats where all
the hash came from. Used a linear supply and all clear.

Cya Peter
Click to expand...
Thought so.
 
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