Dirty Digital [sic.]
 

tony sayer wrote:

Phil scribeth thus
"tony sayer"

I know several recentish studios supervised by my 'mate' that have had
whole building EMC screens installed.

They really -necessary- these days?...


** When were the laws of physics repealed - Tony ?

Well to my knowledge they haven't as yet;)..

Good. You'll have heard of this thing called 'electro-magnetic induction' in that
case.


Graham

Dirty Digital [sic.]
 

tony sayer wrote:

As for two way vehicle radios, yes we've all heard that coming through.
It always means there is a problem like a bad joint somewhere that is
rectifying.

More likely a semi conductor junction that hasn't been by passed at
those frequencies...

You puts caps around every b-e or c-b junction ?

How about ICs ?

Graham

Dirty Digital [sic.]
 

Eeyore wrote:

tony sayer wrote:

Eeyore scribeth thus
You're looking in the wrong places in the spectrum btw. Amateurs !
Where would you suggest then?..

The AUDIO frequency band maybe ? Talk about missing the bleeding obvious.

In my little description of making tests did I once mention a receiver ?

Graham


You find the EMI in the audio band is the big problem? That has to be a
first for me. What are the big sources, do you find? And what is the
pickup mechanism - I mean as a fraction of a wavelength, everything in a
studio is tiny, hardly an antenna.

d

Dirty Digital [sic.]
 

tony sayer wrote:

How did you keep train noise and vibration out?...

It's amazing how effective mass is. Not sure if it was sprung in that instance.

Graham

Dirty Digital [sic.]
 

Eeyore wrote:

Don Pearce wrote:

Eeyore wrote:
Phil Allison wrote:
"tony sayer"
I know several recentish studios supervised by my 'mate' that have had
whole building EMC screens installed.
They really -necessary- these days?...
** When were the laws of physics repealed - Tony ?

GSM phones are the number one culprits for breaking into audio equipment of
all kinds. You can ban them from the studio itself, but how do you keep all
of them at a safe distance all of the time ?

Then there are VHF and UHF two way radios that travel around in commercial
and private vehicles - even the briefest injection of the signal from one
means having to redo something.

EMC screening is just as important as ever for a serious recording facility.
Continuous welded 2mm mild steel typically does the job.

That is magnetic screening - totally different thing to EMC screening.

The M in EMC IS "magnetic".

Graham


Er - no. The EM in EMC is electromagnetic. That is totally different to
magnetic.

d

Dirty Digital [sic.]
 

"Dave Plowman (News)" wrote:

Eeyore wrote:
Close miking rarely captures the real sound of the instrument.

Define the real sound and why a mic with a clipping level of 145 dB
can't do it.

Nothing to do with clipping - it's just that the true sound of say a sax
doesn't come from the bell. Pianos not from the strings either. Strings
not from the actual strings. Etc, etc.

So where exactly ?

Graham

Dirty Digital [sic.]
 

Eeyore wrote:

Don Pearce wrote:

The equipment you use in your studio should have all the screening it
needs built into it. A Faraday cage for electric guitar is all the extra
that should ever be needed.

Try installing a studio near a railway track. You know how they do signalling ?

Graham


Remember what I was saying earlier about structure-borne LF noise?
Install a studio near a railway track and you will very quickly find out
why you don't do that, and it has nothing to do with signalling.

Oh, and they do signalling through wires, not radio.

d

Dirty Digital [sic.]
 

Eeyore wrote:

tony sayer wrote:

Phil scribeth thus
"tony sayer"

I know several recentish studios supervised by my 'mate' that have had
whole building EMC screens installed.
They really -necessary- these days?...

** When were the laws of physics repealed - Tony ?
Well to my knowledge they haven't as yet;)..

Good. You'll have heard of this thing called 'electro-magnetic induction' in that
case.


Graham


Can you please go and rad up on this subject, because you are muddled.
There is no "electromagnetic" induction. Induction is a purely magnetic
phenomenon.

d

Dirty Digital [sic.]
 

Don Pearce wrote:

Eeyore wrote:
tony sayer wrote:
Eeyore scribeth thus

You're looking in the wrong places in the spectrum btw. Amateurs !
Where would you suggest then?..

The AUDIO frequency band maybe ? Talk about missing the bleeding obvious.

In my little description of making tests did I once mention a receiver ?

You find the EMI in the audio band is the big problem? That has to be a
first for me. What are the big sources, do you find? And what is the
pickup mechanism - I mean as a fraction of a wavelength, everything in a
studio is tiny, hardly an antenna.

Describe the construction of a dynamic microphone. Or a tape head.

Graham

Dirty Digital [sic.]
 

Eeyore wrote:

Don Pearce wrote:

Eeyore wrote:
tony sayer wrote:
Eeyore scribeth thus

You're looking in the wrong places in the spectrum btw. Amateurs !
Where would you suggest then?..
The AUDIO frequency band maybe ? Talk about missing the bleeding obvious.

In my little description of making tests did I once mention a receiver ?
You find the EMI in the audio band is the big problem? That has to be a
first for me. What are the big sources, do you find? And what is the
pickup mechanism - I mean as a fraction of a wavelength, everything in a
studio is tiny, hardly an antenna.

Describe the construction of a dynamic microphone. Or a tape head.

Graham


You answer mine first.

d