Patent US3683384A successfully refreshed from Google Patents.
US3683384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio direction finder
Assignee: Vec Trak Research & Dev Corp
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Filing: 1969-07-22
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Granted: 1972-08-08
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Expires: 1989-07-22
Abstract
Abstract A radio direction finder encased in a gun-like housing and having an opening in the housing through which a replaceable fixed single frequency tuner module may be inserted in to the circuit, the tuner module being precisely tuned to the radio frequency of a radio beacon to be detected. Interposed between the output of the audio amplifier of the radio direction finder and the speaker therefor is an audio frequency filter tuned to pass the audio frequency tone of radio beacons but to filter out all other audio frequencies, whereby to reduce the amount of noise presented to the listener.
Inventors
- 👤 Maurcie A Warren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:46
CPC Classifications
H; H03; H03J; H03J5/00; G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
65 words
A radio direction finder comprising a directional antenna, a removable tuner module fixedly tuned to a preselected radio frequency, and quick connect-disconnect means for removably connecting radio tuner module into said radio direction finder, whereby said tuner module can be disconnected and replaced by another like module tuned to a different radio frequency, and circuit means for connecting said directional antenna to said tuner module.
Claim 2
Dependent Claim
65 words
A radio direction finder comprising a directional antenna, a removable tuner module fixedly tuned to a preselected radio frequency, and quick connect-disconnect means for removably connecting radio tuner module into said radio direction finder, whereby said tuner module can be disconnected and replaced by another like module tuned to a different radio frequency, and circuit means for connecting said directional antenna to said tuner module.
Claim 3
Dependent Claim
38 words
The radio direction finder of claim 1, wherein said quick connect-disconnect means comprises complementary interfitting members, one fixed on said tuner module and the other fixed on said directional antenna and the balance of said radio direction finder.
Claim 4
Dependent Claim
54 words
The radio direction finder of claim 2, further comprising a housing for said directional antenna and said balance of said radio direction finder, said housing having an opening therein, said other member of said quick connect-disconnect means being rendered accessible to said first mentioned complementary member of said quick connect-disconnect means through said opening.
Claim 5
Dependent Claim
22 words
The radio direction finder of claim 3, said tuner module being encased in an enclosure including said first mentioned complementary interfitting member.
Claim 6
Dependent Claim
33 words
The radio direction finder of claim 4, wherein said housing is formed of an elongated hollow barrel with a handle depending therefrom, and said opening is at the front end of said barrel.
Claim 7
Dependent Claim
14 words
The radio direction finder of claim 5, further comprising a compass on said barrel.
Claim 8
Independent Claim
99 words
A method of taking a bearing on a radio beacon using a radio direction finder including a directional antenna, a removable tuner module fixedly tuned to a preselected radio frequency, and quick connect-disconnect means for removably connecting said tuner module into said radio direction finder, selecting from from a group of like tuner modules fixedly tuned to different frequencies the module tuned to the frequency of said radio bearing, removing the tuner module connected to said radio direction finder, connecting said selected tuner module to said radio direction finder, and moviNg said directional antenna to produce a tonal null.
Claim 9
Independent Claim
99 words
A method of taking a bearing on a radio beacon using a radio direction finder including a directional antenna, a removable tuner module fixedly tuned to a preselected radio frequency, and quick connect-disconnect means for removably connecting said tuner module into said radio direction finder, selecting from from a group of like tuner modules fixedly tuned to different frequencies the module tuned to the frequency of said radio bearing, removing the tuner module connected to said radio direction finder, connecting said selected tuner module to said radio direction finder, and moviNg said directional antenna to produce a tonal null.
Claim 10
Dependent Claim
17 words
The radio direction finder of claim 5, wherein said directional antenna is disposed within said hollow barrel.
Claim 11
Dependent Claim
17 words
The radio direction finder of claim 6, wherein said directional antenna is disposed within said hollow barrel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |