Patent
1977-10-28
1979-03-06
Olms, Douglas W.
325 29, H04B 346
Patent
active
041432517
ABSTRACT:
Circuitry and method for locating buried splices and features of concealed or buried telephone cables or other objects. A small, sealed, low power transmitter is encapsulated with the splice and is concealed or buried therewith. A pair of wires for providing operating power to the transmitter is included in the telephone cable and extends from an exciter circuit to the transmitter. The exciter circuit produces a periodic power waveform on the pair of wires. The transmitter includes a radio frequency oscillator, an amplifier, and a ferrite antenna. The exciter circuit includes an audio frequency oscillator and a driver circuit to provide the periodic power signal to the pair of wires. The radio frequency output signal of the transmitter is modulated by the frequency of the power signal. A portable receiver is tuned to the frequency of the signal transmitted by the buried transmitter. The portable receiver is transported over the general location of the buried splice. The receiver includes a field strength meter for measuring the strength of the signal transmitted by the buried transmitter. The position of the receiver is varied until the received radio frequency signal field intensity is maximized. The receiver is then located directly over the buried transmitter.
REFERENCES:
patent: 2444426 (1948-07-01), Busignies
patent: 3128431 (1964-04-01), Walker
patent: 3424993 (1969-01-01), Clar
patent: 3496471 (1970-02-01), Shelton
patent: 3882394 (1975-05-01), Koster et al.
The Radio Amateur's Handbook 1972, p. 54.
Dynatel Corporation 500, Jan. 1974.
Olms Douglas W.
Progressive Electronics, Inc.
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