[BC] The Telephone Recording Beep

[Thomas G. Osenkowsky]

The Western Electric KS-19645 coupler has exactly
that. By shorting two terminals it will automatically
generate the beep and notch it out before the AVC
feature (also defeatable). A very popular recorder
coupler in its day.

Tom Osenkowsky, CPBE

> Perhaps stations were wary of putting someone on live, since delay 
> units hadn't been invented yet.  But, ISTM that one could put a notch 
> filter to take out the tone before it hit the air.