Re: Precise dial speed setting
Well I think I have stumbled upon a dream solution to my problem! Quite by chance I have been given a vintage BT ‘Dialled Digit Analyser 1A’ which seems to be exactly what I have been looking for.
I have just tested a dial I set by ‘eye’ and the readings are displayed as follows:
BK/MK 72/21 ms
Speed 10.5 PPS
Near the start of this link Russell W B kindly posted the BT standard for dial speeds as follows:
Minimum inter-digital pause: 400ms.
Permissible range of impulse: 7 - 12 Impulses-per-second (nominally 10).
Standard inpulse ratio: 66.66r% break (tolerance 63% - 72%).
Can anyone confirm that this remains the standard for all current exchanges accepting pulse dialling; and can anyone explain how ‘BK/MK 72/21 ms’ relates to the ‘Minimum inter-digital pause’ and the ‘Standard inpulse ratio’?
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