FRANK J SMITH JR
Engineers in Dresher, PA

3983557, Sep 28, 1976

Apr 28, 1975

5/571844

Ronald Lee Powell - King of Prussia PA
Frank Patterson Smith - Dresher PA

Narco Scientific Industries, Inc. - Fort Washington PA

G01S 956

343 73

Each bin of a one-thousand stage shift register represents a two-tenth mile aircraft to ground station interval, and the register is shifted a full cycle corresponding to a two-hundred mile spacing. During a first shifting epic, all pulses returned from the ground station are inserted into the bins in timed relationship to each other and to transmitted pulses. In subsequent epics, stored pulses from the register are reinstated therein if there is time coincidence with another received signal. Once the register contains one-and-only-one signal, corresponding to the aircraft to station distance, that signal is automatically reinserted for the next three epics, regardless of signal receipt. Further coincidence of a receive signal, however, resets the automatic regeneration for three more periods, and so on. After three periods without a coincidence, all signals are passed to the register during the next epic.

4025923, May 24, 1977

Jan 14, 1976

5/648900

John M. Ferrara - Hardley PA
Frank Patterson Smith - Dresher PA

Narco Scientific Industries, Inc. - Fort Washington PA

G01S 146

343106R

A circuit which allows the operation of a VOR receiver in the presence of unwanted interference signals without sacrificing a fast response to omnirange bearing selector changes. A switching-type synchronous filter is used to filter the 30 Hz AM channel signal in the receiver. The narrow bandwidth of this synchronous filter rejects unwanted interference signals without introducing phase shift into the desired signal. The switching signal for the synchronous filter is generated by the FM channel in such a manner that the switching filter center frequency follows the input frequency. The use of a synchronous filter allows rejection of interfering AM signals that lie outside a narrow pass band, while allowing the receiver to follow variations in frequency of the transmitted signal.

4989013, Jan 29, 1991

Mar 31, 1989

7/332208

Frank P. Smith - Dresher PA
Thomas R. Krishan - Newtown Square PA
Hugh P. McAdams - Port Deposit MD

Litton Systems, Inc. - Springfield PA

H01Q 106

343721

A plural frequency antenna includes a plurality of antenna segment pairs, one for each frequency which is to be transmitted. The segment pairs are serially connected to one another and form a conductive path for DC current which charges a capacitor used to fire a strobe lamp mounted on the top of the antenna.

4980661, Dec 25, 1990

Mar 31, 1989

7/332209

Frank P. Smith - Dresher PA

Litton Systems, Inc. - Springfield PA

H03H 746

333132

A diplexer couples a plurality of RF signals and a strobe signal to the antenna of an emergency transmitter buoy. A plurality of filters in the diplexer each pass a preselected signal to the antenna and block other signals from being reflected into the signal sources.

4184158, Jan 15, 1980

Feb 8, 1978

5/876095

Frank P. Smith - Dresher PA

Narco Scientific, Inc. - Fort Washington PA

G01S 114

343108R

A general aviation navigational receiver is provided with a digital channel selection wherein a channel selection knob on the aircraft control board may be operated to control the functioning of a digitally implemented frequency synthesizer which in turn controls the operation of a voltage controlled oscillator for providing frequency signals to an RF mixer of the unit, the frequency synthesizer being programmed for both possible VOR/LOC and GS channel frequencies wherein switching between frequencies is accomplished in synchronism with the basic clock within the synthesizer greatly reducing transient changeover time.

4215346, Jul 29, 1980

Feb 8, 1978

5/876094

Frank P. Smith - Dresher PA

Narco Scientific Industries, Inc. - Fort Washington PA

G01S 502

343113R

A navigational unit having a time-shared mode of operation for handling a plurality of different navigational signals is provided wherein IF components within the unit may have a dual dedication, i. e. , used in common for handling all signals while normally present separate front end components and navigational display components may be dedicated exclusively to each separate signal, a central timing and control component coordinating the total operation.

3998410, Dec 21, 1976

Oct 28, 1975

5/625880

Frank Patterson Smith - Dresher PA

Narco Scientific Industries, Inc. - Fort Washington PA

G06F 1550, G06G 778

244183

In a DME system, the least significant decade of the present aircraft to ground station distance is maintained encoded in a memory, and an up-down counter maintains a variable count. The complement of the present distance is compared with the present count, and when a difference is detected, a logical pulse increments the counter and also indicates passage of the aircraft through another distance interval. The sense of the difference between the present distance and the count also is monitored, responsive to which the direction of the count is controlled.

4001824, Jan 4, 1977

Apr 28, 1975

5/571843

John W. Bail - Fort Washington PA
Ronald Lee Powell - King of Prussia PA
Frank Patterson Smith - Dresher PA

Narco Scientific Industries, Inc. - Fort Washington PA

G01S 956

343 73

A ranging timer allows decoded data pulses to toggle a flip flop, thereby initiating a transmission cycle. In a specific embodiment, the data pulses condition a second flip flop to energize the DME transceiver. During the next negative excursion of a 96 microsecond reference clock, the second flip flop is toggled, and during the next period of the reference clock, the decoder is disabled, the transmitter-modulator is energized, the ranging timer is enabled, and the first flip flop is reset. Since the time between the decoded data pulses is variable, jitter is built into the commencement of each transmission cycle.

3987988, Oct 26, 1976

Apr 28, 1975

5/571845

Ronald Lee Powell - King of Prussia PA
Frank Patterson Smith - Dresher PA

Narco Scientific Industries, Inc. - Fort Washington PA

G05D 108

244182

A voltage controlled oscillator provides a pulse signal which, when frequency scaled, is representative of aircraft velocity. Pulses representative of passage of the aircraft over distance intervals are coupled to one input of a comparator-integrator, and the VCO output pulses are further divided and coupled to the other input terminal of the comparator-integrator. The integration voltage controls the VCO. The VCO signal is frequency scaled and fed to a counter, the output count of which is strobed periodically and decoded to yield velocity.

4184157, Jan 15, 1980

Feb 8, 1978

5/876096

Frank P. Smith - Dresher PA

Narco Scientific, Inc. - Fort Washington PA

G01S 114

343108R

In an information receiving apparatus having a time-shared mode of operation for simultaneously receiving a plurality of information carrying signals, at least one signal of which includes an identification tone superimposed thereupon, a tone reconstitution scheme for providing a continuous tone from a received tone signal which contains absences of tone signal due to the time-shared partial duty dedication of the receiver to that signal and its superimposed tone.