"The phone is a remarkably complex, simple device, and very rarely ever needs repairs, once you fix them." - Dan/Panther
Started by benhutcherson, October 21, 2008, 07:21:49 PM
Quote from: dsk on January 23, 2019, 03:26:32 PMI have later measured some REN loads according to the procedure in Ralph Meyer's book.
Quote from: dsk on January 23, 2019, 03:26:32 PMREN is the most difficult and un-logical value I have tried to measure, at least according to the old definition of being the number of ringers equal to a Western Electric 500 telephone.The later specification of a sudden impedance at 20Hz (25Hz in UK) is much more logical. Here in Norway they only specified max 2 ringers (delivered by the monopoly) Of course on extremely long rural lines this was max, but in urban areas you could probably make it 4. I have later measured some REN loads according to the procedure in Ralph Meyer's book. These ringers was often about 2 US REN.Simplifying to ohmic values as Andy do are not completely reliable, but gives a pretty good idea of whats right. The capacitor size and the match between the capacitor and the coil is actually important to get an exact reading. I can confirm my guestimate about the REN values definitely works for both UK and US phones here in England. I have a mixture from both sides of the pond in use here all the time.dsk