Dirty Digital [sic.]
 

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 don't screen it, you fix it. You can regard the local
minicab company as a diagnostic aid.

Now less of a problem in practice with the demise of AM modulation
systems..

last one of they around here we said good riddance to around 1985 or
thereabouts
--
Tony Sayer

Dirty Digital [sic.]
 

In article , Eeyore rabbitsfriendsandrel
scribeth thus


tony sayer wrote:

I've been in some of the best studios in Detroit. One of them shared a
building with an auto body repair shop. Go figure.

LMFAO !

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

They really -necessary- these days?...

On YES ! Especially near railway tracks (due to track signalling) ! I wonder if
I
can find some sample files for you. I must have looked like Dr Who himself
wandering around the site with pickup coils, amplifiers and headphones and
nodding occasionally to my colleague.

Graham


What equipment was affected and how?..

How did you keep train noise and vibration out?...
--
Tony Sayer

Dirty Digital [sic.]
 

In article ,
Phil Allison wrote:
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 ?

It's a poorly designed piece of equipment that picks up a GSM phone unless
it is right on top of it. I'd say within 3 ft or so. Plenty is very much
better than this.

--
*Eschew obfuscation *

Dave Plowman London SW
To e-mail, change noise into sound.

Dirty Digital [sic.]
 

In article ,
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.

--
*When the going gets tough, use duct tape

Dave Plowman London SW
To e-mail, change noise into sound.

Dirty Digital [sic.]
 

In article ,
Phil Allison wrote:
GSM phones need to be close to the victim equipment to be a problem,
which means they will be inside the building.

** Not true at all.

The GSM phone may be in the hands of a passer by just outside the studio
building or on a floor above or below where the studio is. Without
additional EMI shielding, some items of audio gear are affected ( ie
buzz) at ranges of 5 metres or more.

Look pet, I record on location for a living. Not some amateur know it all
like you. And any equipment which picks up phones from more than about a
couple of feet is just plain badly designed - assuming it's been designed
since mobile phones, that is. Perhaps you need to learn a bit about
balanced circuits. And get rid of that crystal mic.

--
*A bicycle can't stand alone because it's two tyred.*

Dave Plowman London SW
To e-mail, change noise into sound.

Dirty Digital [sic.]
 

In article ,
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.

I always check unknown equipment with a Motorala and GSM phone *before*
use. Very little fails these days. Walkie talkies are still far more of a
problem for zapping things than phones.

--
*If at first you don't succeed, then skydiving definitely isn't for you *

Dave Plowman London SW
To e-mail, change noise into sound.

Dirty Digital [sic.]
 

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

Dirty Digital [sic.]
 

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

Dirty Digital [sic.]
 

Phil Allison wrote:

"Don Pearce"

GSM phones need to be close to the victim equipment to be a problem, which
means they will be inside the building.

** Not true at all.

The GSM phone may be in the hands of a passer by just outside the studio
building or on a floor above or below where the studio is. Without
additional EMI shielding, some items of audio gear are affected ( ie buzz)
at ranges of 5 metres or more.

You know *someone* is about to receive a call in a sec when your equipment
'chirps' at you.

Graham

Dirty Digital [sic.]
 

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