whats that noise? - update

Hi All

I wrote a couple of weeks ago about a problem of a hummy buzzy noise
that seemed to vary as picture on the tv changed - using a Grundig set
top box whihch records to flash memory plugged into the scart socket on
the back of an LG monitor/tv

Well................

I discovered that the volume control on the Grundig was turned right
down and that the volume on the tv was consequently turned right up,
thus ammplifying any buzzy/hummy noise.

Now I have adjusted the volumes, the tv is watchable and no noise! I
haven't actually cured the noise but have cured its effects. I think I
still need to follow up some more of the suggested cures to try and
eliminate it altogether.

regards




Dudley

"Dudley Simons" wrote in message
...
Hi All

I wrote a couple of weeks ago about a problem of a hummy buzzy noise that
seemed to vary as picture on the tv changed - using a Grundig set top box
whihch records to flash memory plugged into the scart socket on the back
of an LG monitor/tv

Well................

I discovered that the volume control on the Grundig was turned right down
and that the volume on the tv was consequently turned right up, thus
ammplifying any buzzy/hummy noise.

Now I have adjusted the volumes, the tv is watchable and no noise! I
haven't actually cured the noise but have cured its effects. I think I
still need to follow up some more of the suggested cures to try and
eliminate it altogether.



I have also have a Grundig USB3 connected to a (little used) (22" Bush
Internet CRT television which exhibits a similar problem, if I stand close
to it I can hear a buzz which is being modulated by the picture content,
however as there's been little in the way of information, or as far as I am
aware, no OTA upgrades since the thing was launched, I won't be holding my
breath that (along with occasional lockups and not seeing a memory device
until being temporarily deprived of power) it is something that is likely
going to be fixed anytime soon.

Yes, well, I think given the prices of the Grundig etc, there will be bound
to be some hash floating about, but it could just as easily be coming from
the tv of cours.
Brian

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"Dudley Simons" wrote in message
...
Hi All

I wrote a couple of weeks ago about a problem of a hummy buzzy noise that
seemed to vary as picture on the tv changed - using a Grundig set top box
whihch records to flash memory plugged into the scart socket on the back
of an LG monitor/tv

Well................

I discovered that the volume control on the Grundig was turned right down
and that the volume on the tv was consequently turned right up, thus
ammplifying any buzzy/hummy noise.

Now I have adjusted the volumes, the tv is watchable and no noise! I
haven't actually cured the noise but have cured its effects. I think I
still need to follow up some more of the suggested cures to try and
eliminate it altogether.

regards




Dudley

In message , Brian Gaff
wrote
Yes, well, I think given the prices of the Grundig etc, there will be bound
to be some hash floating about, but it could just as easily be coming from
the tv of cours.

Grundig is just a brand to badge cheap electronics sourced by Harvard.
The name is in the same league as Alba, Goodmans and Bush, although two
of the brands are now owed by Argos.

--
Alan
news2009 {at} admac {dot} myzen {dot} co {dot} uk

Alan wrote:
In message , Brian Gaff
wrote
Yes, well, I think given the prices of the Grundig etc, there will be
bound
to be some hash floating about, but it could just as easily be coming
from
the tv of cours.

Grundig is just a brand to badge cheap electronics sourced by Harvard.
The name is in the same league as Alba, Goodmans and Bush, although two
of the brands are now owed by Argos.

That said, if you turn the sound down to next to nothing on an expensive
STB and turn the volume up to maximum on the TV, connected up through
the SCART, you can expect to hear some buzz/noise, I would think...

In message , John
Legon writes
Alan wrote:
In message , Brian Gaff
wrote
Yes, well, I think given the prices of the Grundig etc, there will
be bound
to be some hash floating about, but it could just as easily be
coming from
the tv of cours.
Grundig is just a brand to badge cheap electronics sourced by
Harvard. The name is in the same league as Alba, Goodmans and Bush,
although two of the brands are now owed by Argos.

That said, if you turn the sound down to next to nothing on an
expensive STB and turn the volume up to maximum on the TV, connected up
through the SCART, you can expect to hear some buzz/noise, I would
think...

On the few set-top boxes I've experienced, the 'correct' setting for
their volume control is maximum. That is when the TV volume is the same
as when it is receiving signals directly from an aerial.
--
Ian

Ian Jackson wrote:
In message , John
Legon writes
That said, if you turn the sound down to next to nothing on an
expensive STB and turn the volume up to maximum on the TV, connected
up through the SCART, you can expect to hear some buzz/noise, I would
think...

On the few set-top boxes I've experienced, the 'correct' setting for
their volume control is maximum. That is when the TV volume is the same
as when it is receiving signals directly from an aerial.

Curiously, looking at the specs for a couple of my STBs - which were
bought as the same model but actually have different electronics - one
specifies a SCART audio output of 0.5 V rms into 1 k ohm, and the other
has 2.0 V rms into 10 k ohm.

Although the effective output voltage will depend on the load impedance,
this does raise a question as to what the standard is supposed to be.

In article , John Legon
wrote:
Curiously, looking at the specs for a couple of my STBs - which were
bought as the same model but actually have different electronics - one
specifies a SCART audio output of 0.5 V rms into 1 k ohm, and the other
has 2.0 V rms into 10 k ohm.

Although the effective output voltage will depend on the load impedance,
this does raise a question as to what the standard is supposed to be.

That would depend on where the specified voltage was in relation to "zero
level" for the programme feed. In broadcasting, zero level is 775mV RMS,
but this is 8dB below peak, which is a couple of Volts or so, and in
designing amplifiers you'd have to allow a bit of headroom above that,
which allows quite a range of numbers depending on exactly what you choose
to specify.

Rod.
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