Re: BBC Resources Question



M. J. Powell wrote: 
In message <43C7D415.3080203@xxxxxxxxxxx>, m <cawdor@xxxxxxxxxxx> writes




As can GPO (sic) Trunk Test. I once booked lines for a cricket match in Bristol a week early. The TT man rang up to tell me!

Are they still Trunk Test?

Mike 

Ah the good old days!!

London PWs - Private Wires - (GPO lines provision - long distance) based in Faraday (2nd Floor?). Probably got the phone number in my book somewhere!! Something like 01 236 1801 from memory.

Equalisation from TT to BH was EV3 L/C .00425 and 10dB basic loss (isn't it wonderous what we remember!!)

They handled all the long distance temporary lines.

GPO Tower handled local London lines (and a few from further).

We were the guys who went out before the broadcast to test the lines installed by GPO and our colleagues in BH checked them and set up necessary equalisation - a skilled job of course.

Even more fun was setting up lines for Eurovision commentators. They wanted separate go and return paths so they could hear their country's sound and talk back to them. Because GPO charged so much for 2 separate lines, we used to convert the 2wire to a 4wire circuit. To get maximum separation, one used to actually build networks in the field to match the converters to the impedance of the line.

Officially this required bridges etc but lazy(clever?) engineers would do it by hissing down the line from a telephone and adjusting the networks to get the least back in the earpiece.

This was much quicker and resulted in longer in the pub!!

Also another experienced (?) engineer used to never change frequency when doing final tests on lines so that all seemed perfect and pub time was closer.

It's all to easy now. Just an ISDN line with a codec can give good(ish) 15Kc/s circuits with minimal noise - whats the fun in that?

A contact in BBC News tells me that they are even considering doing live reports via Internet telephony.

Mike

(Far too old to be going on about such things really)

.

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