"The phone is a remarkably complex, simple device, and very rarely ever needs repairs, once you fix them." - Dan/Panther
Started by Phonesrfun, March 30, 2010, 06:28:28 PM
Quotewe are getting a little off the topic of dan's amazing find. but to the subject of equalizers i would like to add that loads coils are installed in the plant now. simply put these are amplifiers placed at 6k intervals on loops >18k. not sure when these came into use. but load coils ensure signal is as strong 8 miles away from the CO as it would be next door to the CO. so i am thinking once load coils were in use, the equalizer was no longer necessary also due to this amplification, i think a 302 would sound just fine regardless of loop length. http://tinyurl.com/ygq39yf
Quote from: bwanna on March 30, 2010, 09:04:33 PMbill, wasn't the whole reason for the development of the 500sets to accommodate rural customers. in other words, longer loop lengths? to put in in layman terms the equalizer basically lowered the juice on shorter loops?ralph at 2miles, loads would not be necessary. placement is usually >18k... the first load at 3k, subsequent loads at 6k intervals.
Quote from: gpo706 on March 30, 2010, 07:03:03 PMGPO 706's had a regulator board which could be put in and out of circuit by removing, turning upside down and re-inserting it.http://www.britishtelephones.com/t706.htmAUTOMATIC SENSITIVITY REGULATORRegulator No. 1 consists of a small printed wiring board on which are mounted a Resistor, Bulb, No. 15, Rectifier-element No. 209 and two carbon resistors of 15 and 47 ohms connected as shown on Dgm N 801. These components are soldered directly into the printed wiring pattern which is connected to the telephone circuit by five plug points formed on one end of the board. Three more plug points, which are strapped together, are provided at the other end of the board so that reversal of the regulator board in its jack will remove it electrically from the telephone circuit. All the printed wiring plug terminations axe coated with a thin layer of solder to provide good contact with the jack springs when the regulator is plugged in.