pdf 852-220-102-i2-500 Series Transmission C D Sets Tl Popular

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852-220-102-i2-500_Series_Transmission_C_D_sets_tl.pdf

852-220-102-i2-500 Series Transmission C D Sets Tl
October 1956.  Electrical characteristics and transmission performance of the 500 and 501 C and D sets.  Crosstalk and sidetone considerations and effects of longitudinal noise and set unbalance.  (Using 425B network with varistors.)  Circuit description and diagram.

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