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From: "Phil Allison"
References: <firstname.lastname@example.org> <email@example.com> <7a9M9.6086$jM5.firstname.lastname@example.org>
Subject: Re: Audio noise in diff amps
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Thu, 19 Dec 2002 21:40:19 +1100
NNTP-Posting-Date: Thu, 19 Dec 2002 21:28:28 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Don Pearce" wrote in message
> >> So have I got it right, Phil? Are you a liar, or simply too
> >> incompetent to know that -110 dBm is a power? I will let you choose.
Phil wrote in reply:
> > ** In the world of audio, Mr Pearce, "dBm" may or may not be true
> >power. It commonly refers to the reference level of 1mW at 600 ohms or
> >0.775 volts as was clearly the case here.
> When you find yourself in a hole that is getting deeper, the rule is
> "STOP DIGGING".
** Hoy there !! I can barely see you Mr Pearce - your hole is half way
to China right now.
> If you are working in an audio system which has a 600 ohm impedance,
> and hence can permit such a short cut, then you don't have a 22000
> resistor to get noise from - you have 22000 in parallel with 600 ohms
> which will have a much lower noise voltage.
** 0.775 volts is naturally a voltage level. It does not matter what
the actual impedances are. The modern and more correct term is "dBu" which
John W has pointed out and I concurred with. But "dBm" was the OPs term so
I used it.
> You keep wriggling, and introducing new ways in which you could have
> fouled up, and now you have another choice.
** Nothing new. I mentioned the 0.775 volts reference ( or 775 mV) in
my second post in the thread. I thought anyone would know the connection
with the old "dBm" standard in audio.
Buy not you it seems.
>> Did you get the resistance wrong, the power wrong or what?
** For a man who has got nothing right so far you are beingnvery
> > You really shouldn't let Usenet archive your posts - they will always
> >> come back and bite.
> > ** It is your idiot posts that are biting you here Mr Pearce.
> > It is your pig arrogance that is your downfall.
> > It is, however, your pommy smugness that most unbearable.
> > .......................... Phil
> Now we get to the truth at last. It wasn't that I was right that hurt
> you, the problem was that I am English.
** The reason you are making such a silly error and carrying on like a
> That makes you a racist as well as a liar.
** Dislike of poms is universal - even poms can't stand eachother.
> You just go on getting attractive with every post, Phil.
** And you are getting more and more desperate and crazy - Mr Pearce.
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