Getting matching transformer from telephone

No, I am your superior, and there is nothing that you can do about it, amp boy.

He has far more of a clue than a dumbfuck like you does.

You think that "Shannon" is a girl's name.

Christ, you are even more retarded than Roy is!

That is some accomplishment!

45 years ago it certainly was!

-- Stuart Winsor

For Barn dances and folk evenings in the Coventry and Warwickshire area See:

In article , Archimedes' Lever scribeth thus

Ummmm....

A standard UK BT NTTP socket as used for the UK POTS would have a gas tube arrestor -across- the line. IIRC there is a centre tapped point which might be earthed, but in most all cases won't be;-(..

So several miles of OHL and just that and an -out of service- resistor doesn't seem like much effective protection to what nature can deliver....

--
Tony Sayer

In article , Eeyore scribeth thus

More fibre these days, BT seems to be taking their large scale microwave equipment's out of service very quickly.

They do however in common with other carriers seem to be using microwave more for last mile applications but for "trunk" applications fibre is the main or only means of transmission...

--
Tony Sayer

In article , Eeyore scribeth thus

but

under

Apart from providing the -return path- for the current sent over the balanced pair;)...

And the last time I came across a centre tapped transformer

--
Tony Sayer

In article , Paul B scribeth thus

Interesting that your on VM there shouldn't be any really noticeable noise with that device from an initial look of it. Any chance of posting a recording anywhere this might provide an idea of what's up...

That might be wroth a try. On the odd occasion when I've needed to record a phone call an RS components 1:1 transformer worked very well 'tho I had to pot it down a bit and use a series cap on the input side. Not exactly strictly tech correct but good enough for purposes..

And that was on a *VM line too....

*Just a note for those not in the UK VM is Virgin Media which is the new operator for what was/is most of the UK cable companies.

They provide POTS services like BT do but whereas BT will provide service over up to 7-8 km of copper from an exchange, they tend to use roadside cabinets, fibre fed using usually Nokia equipment's, with rarely more than a Kilometre of copper to the subs premises as they only service urban and sub urban areas..

--
Tony Sayer

Don't confuse him with facts. He has trouble breathing and typing at the same time.

--
http://improve-usenet.org/index.html

aioe.org, Goggle Groups, and Web TV users must request to be white
listed, or I will not see your messages.

If you have broadband, your ISP may have a NNTP news server included in
your account: http://www.usenettools.net/ISP.htm


There are two kinds of people on this earth:
The crazy, and the insane.
The first sign of insanity is denying that you\'re crazy.

Want to to see the schematics ? I'm sure I still have them here somewhere.

Graham

Proof positive. How's your DSP btw ? Ultra-low noise analogue circuitry, interfacing one to the other etc ?

Graham

Minority use even then.

Try and think WHY.

Graham

You left out the isolation transformer in the phone.

Also, the tube will have a return path, and quell any HV down to non-arcing voltages.

And that fact STILL does not negate the fact that you have no grasp of it.

More proof, donktard! You can actually have a schematic available, and spew horseshit without even referring to it. You can actually have it, and have no concept of how to interpret it as well. You're a real wiener, donktard.

You really are one dumb donkey.

I use dual Sharcs. You use NOTHING, because you are all talk...

...and lame ebay auctions for your pathetic gear by folks that do not want your pathetic gear any more.

How many do you own, pathetic donkey?

Bwuahahahahahahahaha!

Well, lets see now.

Because Graham doesn't like being proved wrong?

Because I didn't spend 20 or more years of my life measuring and testing audio systems, equipment and GPO lines that were all designed for 600 ohm characteristic impedance (among other things)?

Because until the 1980s (I think it was) The GPO/BT didn't have a monopoly on telecommunications, including the distribution of audio down its many miles of cable? [1] Minority use?

Because the BBC didn't have a number of large and small studio complexes where 600 ohms was the norm (Not anymore but it was then) for audio?

Because even the most modern audio test equipment doesn't have facilities for measuring 600 ohm systems? - Oh dear, another wrong answer.

Because this isn't a binary group and I don't have a website on which post proof positive that you are wrong but would you would ignore anyway?

However, let me try this quote on you. From "Studio engineering for Sound Broadcasting" - Iliffe - 1955 (that's about 45 years ago) p20: "The chain incorporates a Post office line and to avoid confusion.......In the early days most Post office lines were open wire lines and all these had an impedence of about 600 ohms"

Stuart

[1] Remember, we were discussing the history of why 600 ohms became the standard impedance for *audio distribution*. Not teleprinters, telegraph systems or even telephone wiring; or why the microphone input of a mixer desk is around 2k ohms.

--
Stuart Winsor

For Barn dances and folk evenings in the Coventry and Warwickshire area
See: http://www.barndance.org.uk

In article , Stuart scribeth thus

Kingston telecoms anyone;)..

...alright not that much of the UK!....

--
Tony Sayer

Don't think old Jove's bolts will notice that much;)..

--
Tony Sayer

Actually I did have them in mind whilst composing my reply but forgot while I was typing. :-)

--
Stuart Winsor

For Barn dances and folk evenings in the Coventry and Warwickshire area
See: http://www.barndance.org.uk