US4613831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio, ultrasonic and RF noise generator for demonstration of electrical interference
Assignee: Individual
•
Filing: 1985-10-16
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Granted: 1986-09-23
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Expires: 2005-10-16
Abstract
Abstract A portable low-output-level generator producing simultaneous audio, ultrasonic and RF noise for the test and demonstration of instruments designed to locate electrical interference, for demonstration of the broad frequency spectrum of electrical noise radiation, for antenna tests, to test the EMI susceptibility of electronic equipment, and to illustrate the effects of said noise on TV and radio receivers. This generator is enclosed in a housing and communicates audio and ultrasonic sounds to the observer via a vibrating diaphragm mounted on the face of the housing, with means provided to attenuate the audio sounds relative to the ultrasonic, and this generator radiates RF from a retractable antenna mounted on and extending outward from the housing.
Inventors
- 👤 Marvin O. Loftness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:38
CPC Classifications
H; H03; H03B; H03B29/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
82 words
An audio, ultrasonic and radio frequency (RF) generator including: a. an enclosure, b. a sparking noise module within the enclosure which simultaneously emits low-level audio, ultrasonic, and RF medium frequency (MF), high frequency (HF), very high frequency (VHF), and ultra high frequency (UHF) radiations, c. a low-voltage battery power supply, d. an RF-radiating antenna located on the enclosure, e. a diaphragm on the enclosure for transmitting said audio and ultrasonic radiations, f. a switch on the enclosure for activating the noise generator.
Claim 2
Dependent Claim
82 words
An audio, ultrasonic and radio frequency (RF) generator including: a. an enclosure, b. a sparking noise module within the enclosure which simultaneously emits low-level audio, ultrasonic, and RF medium frequency (MF), high frequency (HF), very high frequency (VHF), and ultra high frequency (UHF) radiations, c. a low-voltage battery power supply, d. an RF-radiating antenna located on the enclosure, e. a diaphragm on the enclosure for transmitting said audio and ultrasonic radiations, f. a switch on the enclosure for activating the noise generator.
Claim 3
Dependent Claim
15 words
An audio, ultrasonic and RF generator of claim 1 including a compact and pocket-size enclosure.
Claim 4
Dependent Claim
19 words
An audio, ultrasonic and RF generator of claim 1 including an antenna that can be retracted into the enclosure.
Claim 5
Dependent Claim
25 words
An audio, ultrasonic and RF generator of claim 1 wherein the RF output level may be adjusted by changing the length of an extendable antenna.
Claim 6
Dependent Claim
17 words
An audio, ultrasonic and RF generator of claim 1 which operates with a safe low-voltage power supply.
Claim 7
Dependent Claim
42 words
An audio, ultrasonic and RF generator of claim 1 wherein a threaded socket is provided in the bottom of said enclosure to permit mating with the standard mounting-screw of a photographic tripod, and permit mounting on such a tripod or other support.
Claim 8
Dependent Claim
28 words
An audio, ultrasonic and RF generator of claim 1 including a single push-type SPST switch with the feature of permitting steady on-off switching action or momentary-on switching action.
Claim 9
Dependent Claim
27 words
An audio, ultrasonic, and RF generator of claim 1 including a small-gap sparking noise module consisting principally of a low voltage electromagnetic relay with sparking back contacts.
Claim 10
Dependent Claim
33 words
An audio, ultrasonic and RF noise generator of claim 1 including means for mounting the noise module such that audio emissions are reduced while ultrasonic and RF radiations remain at normal generator level.
Claim 11
Dependent Claim
32 words
An audio, ultrasonic and RF generator of claim 1 wherein the noise module is mounted on a printed circuit board with provisions on this board for a free-hanging suspension within the enclosure.
Claim 12
Dependent Claim
36 words
An audio, ultrasonic and RF generator of claim 1 wherein the printed circuit board of the noise module is oriented so as to be substantially parallel to the diaphragm for good ultrasonic activation of the diaphragm.
Claim 13
Dependent Claim
28 words
An audio, ultrasonic and RF generator of claim 1 wherein the noise module is suspended by light-gauge stranded wires which also act as connecting-wires for the electrical circuitry.
Claim 14
Dependent Claim
37 words
A generator of claim 1 designed such that the simple addition of a filter capacitor to the circuit within said enclosure will cause the RF frequency range to be limited while maintaining the audio and ultrasonic radiations.
Claim 15
Dependent Claim
22 words
An audio, ultrasonic and RF noise generator of claim 1 which provides a broad-frequency-spectrum isolated noise source for antenna and other tests.
References Cited (Backward Citations)
US976778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |