Dirty Digital [sic.]
 

In article ,
Eeyore wrote:
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 ?

Well, take a piano. That has a sounding board. So sticking a mic close to
the strings alters the harmonic balance compared to a more distant one.

Same with string instruments which have some form of resonator.

--
*Do infants enjoy infancy as much as adults enjoy adultery?

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

Dirty Digital [sic.]
 

In article ,
Phil Allison wrote:
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.


** Wot a stupid, lying,

Lying? I think you get 'The Bill' in Oz? Keep an eye out for my name in
the credits before calling me a liar. The one two weeks ago in the UK for
example, and the one this week...

trolling, ego tripping moron like YOU assumes has
got not got one tiny thing to do with reality.

Care to try that again without all the spittle and bulging eyes?

If mobile phones and taxis etc were the problem you seem to think I'd not
be able to do my job. You simply can't stop members of the public having
such things close to where we're shooting.

--
*Everyone has a photographic memory. Some just don't have film*

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

Dirty Digital [sic.]
 

In article ,
Phil Allison wrote:

"Dave Plowman (News) Complete **** "

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.



** So ****ing what ????????????????????

The real world is FULL of poorly designed audio gear.

Your world obviously. Perhaps it's down to your trailer not being properly
screened.

****ing musos own bucket loads of it and DRAG it all into recording
studios when they go there.

You need to move on from demos at your age. But you'd need a personality
transplant first.

Go eat ****

- you mother ****ing pile of autistic

Heh heh - try reading some of your own posts.

pommy vermin.

Can't you think of a few new insults?

...... Phil

Are those dots thinking time before typing your name?

--
*No I haven't stolen it , I'm just a **** driver*

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

Dirty Digital [sic.]
 

In article , Phil Allison
scribeth thus

"tony sayer"

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..


** GSM phones ARE AM !!!!!!!!!!!!!!!

A form of AM .. QAM...

The carrier is gated on and off hundreds of times a second.


Indeed..

That is why they make audio gear buzz - you dumb ass.

Ah!, thats true .. but its only because most all accidental demodulation
is "Amplitude" in nature this mechanism isn't a frequency discriminator
as such hence the "apparent" noise. FM and CW for that matter can affect
equipment but do it in a different way..






The old analogue phones were simple FM and had no such issues.

Yes they did but they, as explained above, weren't quite so apparent but
they could and do cause voltage shifts and suchlike which is
"interference" albeit of a different nature...




...... Phil






--
Tony Sayer

Dirty Digital [sic.]
 

In article , Eeyore rabbitsfriendsandrel
scribeth thus


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


Well the only equipment that chirps in here is the landline phone and
the old PC speakers. This isn't a problem as such its just poor design
with no considerations given to EMC..
--
Tony Sayer

Dirty Digital [sic.]
 

In article , Eeyore rabbitsfriendsandrel
scribeth thus


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


Graham..

I think you ought to look into what EMC means, there is Magnetic like
audible hum induction and RF interference the Elecro part.

I trust that you see they are different. Otherwise why would EMC specs
state things like "in a field exceeding a 100 volts per metre"?..

Now that isn't a magnetic parameter in the AF band is it?..

Or did you mean that your friends make rooms that are screened against
magnetically induced fields?..

--
Tony Sayer

Dirty Digital [sic.]
 

In article , Eeyore rabbitsfriendsandrel
scribeth thus


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 ?


Among other things..

How about ICs ?

Input filtering and RF suppression in feedback loops and by passing
components...

Graham


--
Tony Sayer

Dirty Digital [sic.]
 

In article , Don Pearce
scribeth thus
Eeyore wrote:

Don Pearce wrote:

Eeyore wrote:
Don Pearce wrote:
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 ?
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
Just done one, well Westwick has.


, and it has nothing to do with signalling.
I believe that's what it is. Funny warbling noises. I may have it on MD
somewhere.
Interested to hear it.

If I can find it you're welcome.


Oh, and they do signalling through wires, not radio.
Who said anything about radio ?
Kind of needs to be wireless to radiate to a nearby building.

No. A large magnetic field. It amazed me at its range in fact.

Graham


I've seen railway signalling wire (a mate of mine drives for South West
Trains) and it is heavy duty twin flex. It doesn't use earth for its
return, so it should not be generating magnetic fields - far too small a
loop.

d

Its usually done as part of "track circuiting" this is on non
electrified lines at DC, but owing to the traction return currents they
do use AC signalling in the rails..
--
Tony Sayer

Dirty Digital [sic.]
 

Don Pearce wrote:

Eeyore wrote:
Don Pearce wrote:
Eeyore wrote:
http://64.233.183.104/search?q=cache...7&client=opera

Magnetic Field Immunity 50Hz-10kHz
Test methods detailed in Annex A of EN55103-2
Right. So equipment is already specified as immune to magnetic fields.
No need to add shielding then.

Have you been taking drugs today or something ? Or did your brain not wake up with the rest of your body ?

Which part of "Test methods detailed in Annex A of EN55103-2" did you miss ?


Nope, saw that.

Good, so you'll know that Annex A describes the test fixture to be used then won't you ?

Graham

Dirty Digital [sic.]
 

In article , Eeyore rabbitsfriendsandrel
scribeth thus


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.


Yes .. a friend of mine lets us use their EMC chamber for immunity
testing...

--
Tony Sayer