US3622680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doppler radio direction finding, testing and teaching device
Assignee: Individual
•
Filing: 1969-10-10
•
Granted: 1971-11-23
•
Expires: 1989-10-10
Abstract
Abstract An auxiliary device for the testing of doppler radio direction finding equipment may also simulate various navigational situations on that equipment for the purpose of instruction. The testing and instructional device operates from an internal timing circuit of the equipment and is synchronized with it.
Inventors
- 👤 Joseph Palmieri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:19
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S3/52; G01S1/00; G01S1/02; G01S1/022; G01S1/028
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
94 words
A maintenance and training simulator for a doppler radio frequency direction finder system having an antenna scanning frequency, said system utilizing an antenna, receiver and local and remOte scope indicators, the simulator including an input adapted to be connected to a position in the system so that its input signal is synchronized with said antenna scanning frequency, a variable phase shift network connected to said input, means connected to said phase shift network and controllable by an operator to vary said phase, an amplifier connected to said phase shift network and having an output.
Claim 2
Dependent Claim
94 words
A maintenance and training simulator for a doppler radio frequency direction finder system having an antenna scanning frequency, said system utilizing an antenna, receiver and local and remOte scope indicators, the simulator including an input adapted to be connected to a position in the system so that its input signal is synchronized with said antenna scanning frequency, a variable phase shift network connected to said input, means connected to said phase shift network and controllable by an operator to vary said phase, an amplifier connected to said phase shift network and having an output.
Claim 3
Dependent Claim
39 words
A simulator as in claim 1 and also including an FM generator having an input and an output, said input being connected to the simulator output and said output being connected to said indicator to simulate a directional strobe.
Claim 4
Dependent Claim
61 words
A simulator as in claim 1 and also including means to transmit said antenna signal to said simulator when said simulator is remote from said system and an FM generator connected to the output of said simulator and an FM transmitter connected to said generator to test the said system by transmitting to its antenna a signal providing a controllable strobe.
Claim 5
Dependent Claim
48 words
A simulator as in claim 1 and also including an FM generator whose input is connected to the output of said simulator, means connecting the output of said generator to said indicator, wherein said simulator also includes a microphone and a loudspeaker is positioned at the remote indicator.
Claim 6
Dependent Claim
25 words
A simulator as in claim 1 and also including a phase reversal switch which operates from the phase shift networks to shift the phase 180*.
Claim 7
Dependent Claim
31 words
A simulator as in claim 1 wherein said control means includes a first dial to select the phase quadrants and a second vernier type dial for the fine selection of phase.
Claim 8
Dependent Claim
39 words
A simulator as in claim 1 wherein said input signal to the simulator is a square wave and said simulator includes a circuit connected in series before said phase shift network to convert said square waves to sine waves.
References Cited (Backward Citations)
US2937456A
Cited
US3023410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |