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Re: Getting matching transformer from telephone

  • Thread starter Tomi Holger Engdahl
  • Start date
R

Ross Herbert

Jan 1, 1970
0
:
:Hello Tony and everyone, I am the OP.
:
:I've been away for a few days and I see there's so many posts that
:now I'm trying to get through them all!
:
:
:MY OBJECTIVE
:
:My aim is to take voice recordings made on various equipment and save
:them to a PC. Some of the voice recordings are of telephone
:conversations made onto tape. I would prefer to have fed the phone
:signal direct to the PC but I get a lot of noise.
:
:I want to preserve as much quality as possible because it will
:probably be necessary for a third party to identify the person
:speaking.
:
:------
:
:Secondly and quite separately from the above....
:
:I didn't raise this problem in my first post. I am getting hum and
:noise when I record using a purpose build connector (Retell model 156
:~ see link below) to a hand-held battery-powered flash-memory
:recorder even when the phone is on hook. I can't see where the hum
:is coming from unless it is on the phone line because there can't be
:a ground loop this time.
:
:http://www.telephonerecorder.co.uk/recording/connectors/156.htm
:
:I do know my landlines don't have all the hum and noise so they must
:be doing something which I want for my recorder! I thought may be a
:transformer to better terminate the Virgin Media phone line might
:help but I am out of my depth here and line termination may be the
:wrong idea altogther.
:
:
:DEFINITIONS
:
:I guess my use of the word "matching" is not a very good electrical
:description. I'm not seeking to match impedances and I get the
:feeling that in electrical engineering, "matching" is often shorthand
:for impedence matching. So apologies for any confusion I have
:caused.
:
:I want to minimise any ground loop to reduce hum and other spuriae so
:perhaps I should have said "isolating" transformer.
:
:Retell have a model (the 157) which connects direct to a PC and I
:believe it is identical to the 156 except it has the additional
:transformer I am asking about.

Get an approved line isolation unit such as this
http://www.dallasdelta.com/pdfs/liu_3kv.pdf

Since your PC is mains powered and it may not have the required isolation
between the mains side and the sound card input you can do your own thing using
an approved 600:600 transformer with 3kV isolation rating to interface the
telephone line to the sound card input.
 
R

Roy

Jan 1, 1970
0
Date: Thu, Jan 1, 2009, 7:24pm (EST-3) From:
[email protected] (Archschemedes' Never)
On Fri, 2 Jan 2009 13:57:33 +1100, "Phil Allison"
** Plus it would jump across the insulation barrier in a 600 ohm line
isolation tranny too !!
      FUCKWIT !
    Except that they ALSO incorporate yet another arrestor at
the service entry. Nice try though...   nice sig too...     Fits
you to a tee. [that's not a sig - it's one of your other names here,
dimmy]

What an Idiot, Lightning Arrestors do not touch the service entry, you
fool..that's the whole point of it, to bypass any lightning that may
strike anywhere near, or on it.

You need to incorporate a lightning arrestor to your ass - you are so
negatively charged you'll be getting direct hits come next storm season
if you don't. Rwahahaha stop guessing responses, you're embarrassing
yourself.

Roy Q.T.
[have tools, will travel]
 
A

Archimedes' Lever

Jan 1, 1970
0
I never even
mentioned ground loops,

You most certainly did.

[email protected] (Roy) writes:

-------------------------------------
Everyone knows that if you don't have a ground loop there may* be static
hum and other noises.If that's what's up then what the OP needs
something like this /=>

In other words, RoyTard... You are the goddamned liar I have always
touted you to be. And yer stupid too, boy.
 
A

Archimedes' Lever

Jan 1, 1970
0
How many times do we have to tell this guy what he needs to do? - use a
preamp - change tape players :) hahaha that was so hard Archschemedes'
got a nose bleed over the topic...


No, dumbass. I actually never answered the OP on his need at all, you
stupid ****.
 
A

Archimedes' Lever

Jan 1, 1970
0
The numbskull must be one of your made up trick nics to salvage the
group which is dying like the other electrical groups because you keep
trying to cunTroll it by scaring and kicking people out


You're an idiot, Roy.

I only tell idiots that they are idiots, and that is what makes them
leave. Us adults call it humiliation, Roy. Retards like you are not as
affected by humiliation though, and that is why your stupid ass has
lingered so long, you stinky fucktard.
 
A

Archimedes' Lever

Jan 1, 1970
0
so now you
make up stupid dipshit questions to keep it going..it's pathetic.Suck it
up and be yourself, Chasquito.


Show me where I 'made up a question', idiot.

Maybe tomorrow you'll come up with something even more retarded to say.
I am starting to have my doubts though as your current crop of retarded
responses will be hard for you to beat. I am sure you'll gibe it your
best shot though.
 
A

Archimedes' Lever

Jan 1, 1970
0
What an Idiot, Lightning Arrestors do not touch the service entry, you
fool..that's the whole point of it, to bypass any lightning that may
strike anywhere near, or on it.


Dumbass! There is a big difference between the lightning arrestor
incorporated into the line panel for a phone service and a lightning rod
'arrestor' attached to a building, you retarded ****.

Come back when your experience is enough that you understand the fact
that there is more than one use for a term, you fucking retarded twit.
 
R

Roy

Jan 1, 1970
0
Re: Getting matching transformer from telephone

Group: alt.engineering.electrical Date: Thu, Jan 1, 2009, 9:13pm (EST-3)
From: [email protected] (Archimedes' Lever)
On Thu, 1 Jan 2009 23:20:03 -0500, [email protected] (Roy) wrote:
I never even
mentioned ground loops,
    You most certainly did.
[email protected] (Roy) writes:
-------------------------------------
Everyone knows that if you don't have a ground loop there may* be static
hum and other noises.If that's what's up then what the OP needs
something like this /=>
    In other words, RoyTard... You are the goddamned liar I have
always touted you to be. And yer stupid too, boy.
----------------
Oh **** You Gaylord... truth is you could have a ground loop but not
between both ends you stupid retarded Idiot! Go and cancel your
coxucking privleges we don't need you....you touted fool.

Roy Q.T.
[have tools, will travel]
 
R

Roy

Jan 1, 1970
0
Re: Getting matching transformer from telephone

Group: alt.engineering.electrical Date: Thu, Jan 1, 2009, 9:15pm (EST-3)
From: [email protected] (Archimedes' Lever)
On Thu, 1 Jan 2009 23:20:03 -0500, [email protected] (Roy) wrote:
How many times do we have to tell this guy what he needs to do? - use a
preamp - change tape players :) hahaha that was so hard Archschemedes'
got a nose bleed over the topic...
    No, dumbass. I actually never answered the OP on his need at
all, you stupid ****.
----------------
Good thing you didn't too, he may just have changed his need an
assfucked you like the complaining little gaytard **** you are.

Roy Q.T.
[have tools, will travel]
 
R

Roy

Jan 1, 1970
0
From: [email protected] (Archimedes' Fever)
On Thu, 1 Jan 2009 23:20:03 -0500, [email protected] (Roy) wrote:
The numbskull must be one of your made up trick nics to salvage the
group which is dying like the other electrical groups because you keep
trying to cunTroll it by scaring and kicking people out
    You're an idiot, Roy.
    I only tell idiots that they are idiots, and that is what
makes them leave. Us adults call it humiliation, Roy. Retards like you
are not as affected by humiliation though, and that is why your stupid
ass has lingered so long, you stinky fucktard.
----------------
You couldn't humiliate me because you can't even hold a candle to me. I
am smarter and more electric savvy than you and your entire
entourage.Another thing: I am not here for your olfactory pleasure, go
home and smell your mommy, you ass pussy sheboy in lingerie.

Roy Q.T.
[have tools, will travel]
 
R

Roy

Jan 1, 1970
0
From: [email protected] (Archimedes' Lever)
On Thu, 1 Jan 2009 23:20:03 -0500, [email protected] (Roy) wrote:
so now you
make up stupid dishier questions to keep it going..it's pathetic.Suck it
up and be yourself, Chasquito.
  Show me where I 'made up a question', idiot.
    Maybe tomorrow you'll come up with something even more
retarded to say. I am starting to have my doubts though as your current
crop of retarded responses will be hard for you to beat. I am sure
you'll gibe it your best shot though.
------
Oh Chasquito, forget it we all saw you.
besides, I'm not a tattletale like you...

Roy Q.T.
[have tools, will travel]
 
R

Roy

Jan 1, 1970
0
Right Back at you Archionmeds' 
 Dumbass! There is a big difference between the lightning arrestor
incorporated into the line panel for a phone service and a lightning rod
'arrestor' attached to a building, you retarded ****.
    Come back when your experience is enough that you understand
the fact that there is more than one use for a term, you fucking
retarded twit.

Like this has anything to do with this topic, you anally challenged
twerp.....

Roy Q.T.
[have tools, will travel]
 
A

Archimedes' Lever

Jan 1, 1970
0
Re: Getting matching transformer from telephone

Group: alt.engineering.electrical Date: Thu, Jan 1, 2009, 9:13pm (EST-3)
From: [email protected] (Archimedes' Lever)
On Thu, 1 Jan 2009 23:20:03 -0500, [email protected] (Roy) wrote:
I never even
mentioned ground loops,
    You most certainly did.
[email protected] (Roy) writes:
-------------------------------------
Everyone knows that if you don't have a ground loop there may* be static
hum and other noises.If that's what's up then what the OP needs
something like this /=>
    In other words, RoyTard... You are the goddamned liar I have
always touted you to be. And yer stupid too, boy.

You're the idiot. You don't even know what a complete circuit consists
of. You don't even know where the term 'ground loop' comes from, you're
so fucking stupid.
Go and cancel your
coxucking privleges we don't need you....you touted fool.

Cancelling you would be much more enjoyable.
 
A

Archimedes' Lever

Jan 1, 1970
0
Re: Getting matching transformer from telephone

Group: alt.engineering.electrical Date: Thu, Jan 1, 2009, 9:15pm (EST-3)
From: [email protected] (Archimedes' Lever)
On Thu, 1 Jan 2009 23:20:03 -0500, [email protected] (Roy) wrote:
How many times do we have to tell this guy what he needs to do? - use a
preamp - change tape players :) hahaha that was so hard Archschemedes'
got a nose bleed over the topic...
    No, dumbass. I actually never answered the OP on his need at
all, you stupid ****.
----------------
Good thing you didn't too, he may just have changed his need an
assfucked you like the complaining little gaytard **** you are.

Roy Q.T.
[have tools, will travel]
As it happens, I have connected several source types to my sound card
in the past, and am quite versed in doing so, and keeping noise, hum, and
ground loops out.

You, on the other hand, know NOTHING about it, and actually stated that
a ground loop was needed!

No amount of squirming in the world is going to help you, RoyTard. You
iz what you iz.

For someone so disinterested in what I have to say, you sure are
staying up late, stalking around behind my posts, dipshit.

Bwuahahahahahahahahahha!
 
A

Archimedes' Lever

Jan 1, 1970
0
You couldn't humiliate me because you can't even hold a candle to me. I
am smarter and more electric savvy than you and your entire
entourage.Another thing: I am not here for your olfactory pleasure, go
home and smell your mommy, you ass pussy sheboy in lingerie.


There is no way in the world that a little 12 year old mentality wuss
like you that uses 'gay' slurs to berate those that disagree with your
retarded, NON_electrical 'facts' has more electrical smarts than I do.


You don't even know what an SMA connector is, Roy. You are an AC
power, electrical wiring dipshit. You have ZERO knowledge of
electronics, and very little knowledge about electrical power.

You humiliate yourself, every time you act like you know what you are
talking about when you give a stupid response to someone and then members
of the group laugh aloud at you for doing it. That is why right now,
nearly all members of the group that have ever responded to you are
referred to by you as 'faggots'. YOu have serious issues, especially
with things revolving around how you take finding our that you are wrong.
You also cannot handle the fact that you are undereducated compared to
the rest of the group, and it is glaringly apparent.

Sorry, Roy... You iz what you iz, and you ain't all that.
 
E

Eeyore

Jan 1, 1970
0
Ross said:
Since your PC is mains powered and it may not have the required isolation
between the mains side and the sound card input you can do your own thing using
an approved 600:600 transformer with 3kV isolation rating to interface the
telephone line to the sound card input.

He DOES NOT need a 600 ohm transformer since the input impedance of the sound card
is not 600 ohms <sigh> !

It's more likely to be in the tens of kilohms.

What he really wants is something like a 10k:10k 'line bridging' transformer. In
practice, using a '600 ohm' transformer will probably be ok, but being incorrectly
loaded will degrade the sound quality (freq resonse may be peaky etc).

Graham
 
E

Eeyore

Jan 1, 1970
0
Floyd L. Davidson said:
Cable type Impedance at 1000 Hz

19NLS 470
19NLP 262
19H50P 675
16B22 806
19H245S 1882

What kind of screwy cables are those ? 1kHz has NOTHING to do with their
characteristic impedance.

Here we use CW1308.

And why the heck do you think ADSL is based around an assumption of
typical 100 ohm charactistic cable / line impedance ?
http://www.st.com/stonline/products/literature/an/7205.pdf

CRETIN !

Graham
 
E

Eeyore

Jan 1, 1970
0
Floyd L. Davidson said:
Except of course when it has loading coils in it, and
then it is something much higher.

Try running ADSL down a line with loading coils ! There's no need for
them anymore. These days you just adjust the line gain.

Graham
 
E

Eeyore

Jan 1, 1970
0
Floyd L. Davidson said:
Then just exactly how do you think the transmitter got
power in those old phones?

OLD (and no longer used) is all you seem to know about.
 
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