Wave transmission lines and networks – Plural channel systems – With balanced circuits
Patent
1975-03-25
1976-10-19
Smith, Alfred E.
Wave transmission lines and networks
Plural channel systems
With balanced circuits
333 24R, 333 32, 333 70R, 333 78, H03H 704, H03H 714, H03H 738, H03H 512
Patent
active
039873757
ABSTRACT:
A telephone transmission bridge including a transformer having primary and secondary windings, connected between first and second input leads and first and second output leads, respectively, has a varistor connected in series with a relatively small number of tertiary windings wound around the transformer core. The tertiary windings and varistor present a high AC impedance to signals transmitted via the input and output leads, thereby permitting AC signals to be transmitted freely via the primary and secondary windings. When transient DC signals are impressed on the input and output leads the tertiary windings and varistor exhibit a low DC impedance, the varistor conducts effectively short circuiting the primary or secondary windings to which the transient signals are transmitted and the transient signals are prevented from being transmitted through the transmission bridge.
REFERENCES:
patent: 1875156 (1932-08-01), Roberts
patent: 2085639 (1937-06-01), Cowan
patent: 2089346 (1937-08-01), Doba, Jr.
patent: 3098195 (1963-07-01), Lennon et al.
patent: 3631333 (1971-12-01), Pichal
patent: 3665125 (1972-05-01), Valbonesi
Hugyecz Matyas
May Peter J.
Nussbaum Marvin
Porter, Jr. William F.
Smith Alfred E.
Stromberg-Carlson Corporation
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