Patent US3667049A successfully refreshed from Google Patents.
US3667049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio frequency pulse transmitter
Assignee: Acrodyne Ind Inc
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Filing: 1970-10-30
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Granted: 1972-05-30
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Expires: 1990-10-30
Abstract
Abstract In a pulse transmitter for airborne distance measuring equipment, the final stage of a two-stage RF amplifier is modulated by a primary modulating pulse having a gradual rise and decay, and the drive stage is modulated by a secondary modulating pulse which envelopes the primary modulating pulse in time so that the final stage has adequate drive before the primary modulating pulse occurs.
Inventors
- 👤 Nathaniel S Ostroff
- 👤 Willie Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:48
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/80; G; G01; G01S; G01S7/00; G01S7/02; G01S7/28; G01S7/282
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
78 words
A modulator for a multiple-stage radio-frequency pulse transmitter having a driver stage and a final amplifier stage comprising: means responsive to a triggering signal for applying a primary modulating pulse to the final amplifier stage, means responsive to the triggering signal for applying to the driver stage a secondary modulating pulse which begins prior to and ends later than the primary modulating pulse, and shaping means for imparting a gradual rise and decay to the primary modulating pulse.
Claim 2
Dependent Claim
78 words
A modulator for a multiple-stage radio-frequency pulse transmitter having a driver stage and a final amplifier stage comprising: means responsive to a triggering signal for applying a primary modulating pulse to the final amplifier stage, means responsive to the triggering signal for applying to the driver stage a secondary modulating pulse which begins prior to and ends later than the primary modulating pulse, and shaping means for imparting a gradual rise and decay to the primary modulating pulse.
Claim 3
Dependent Claim
14 words
A modulator according to claim 1 wherein said shaping means is a low-pass filter.
Claim 4
Dependent Claim
21 words
A modulator according to claim 1 including shaping means for imparting a gradual rise and decay to the secondary modulating pulse.
Claim 5
Dependent Claim
44 words
A modulator according to claim 1 in which said means for applying a primary modulating pulse to the final amplifier stage includes means for effecting a delay from the time the triggering signal occurs to the time of initiation of the primary modulating pulse.
Claim 6
Dependent Claim
82 words
A modulator according to claim 1 in which said means for applying a primary modulating pulse to the final amplifier stage includes means for effecting a delay from the time the triggering signal occurs to the time of initiation of the primary modulating pulse, and in which said means for applying to the driver stage a secondary modulating pulse includes pulse-stretching means for receiving said triggering signal and providing an output pulse having a larger time duration than said primary modulating pulse.
Claim 7
Dependent Claim
82 words
A modulator for a multiple-stage radio-frequency pulse transmitter having a driver stage and a final amplifier stage comprising: means for receiving a trigger pulse and for shaping and delaying said pulse to produce a primary output pulse for modulating the final amplifier stage, and means for receiving said trigger pulse and for stretching said pulse to produce a secondary output pulse for modulating the driver stage, whereby the secondary output pulse begins prior to and ends later than the primary output pulse.
Claim 8
Dependent Claim
82 words
A modulator for a multiple-stage radio-frequency pulse transmitter having a driver stage and a final amplifier stage comprising: means for receiving a trigger pulse and for shaping and delaying said pulse to produce a primary output pulse for modulating the final amplifier stage, and means for receiving said trigger pulse and for stretching said pulse to produce a secondary output pulse for modulating the driver stage, whereby the secondary output pulse begins prior to and ends later than the primary output pulse.
Claim 9
Dependent Claim
28 words
A modulator according to claim 6 in which said means to produce a primary output pulse includes a multiple-section low-pass filter for delaying and shaping said trigger pulse.
Claim 10
Dependent Claim
25 words
A modulator according to claim 6 in which said means to produce a secondary output pulse includes a low-pass filter for shaping said trigger pulse.
Claim 11
Dependent Claim
25 words
A modulator according to claim 6 in which said means to produce a secondary output pulse includes a monostable multivibrator for stretching said trigger pulse.
Claim 12
Dependent Claim
54 words
A radio frequency pulse transmitter comprising: radio-frequency amplifying means having a driver stage and a final amplifier stage, and means for applying a primary modulating pulse to said final amplifier stage and for applying to said driver stage a secondary modulating pulse which begins prior to and ends later than said primary modulating pulse.
Claim 13
Dependent Claim
54 words
A radio frequency pulse transmitter comprising: radio-frequency amplifying means having a driver stage and a final amplifier stage, and means for applying a primary modulating pulse to said final amplifier stage and for applying to said driver stage a secondary modulating pulse which begins prior to and ends later than said primary modulating pulse.
Claim 14
Independent Claim
122 words
A method for generating radio frequency pulses with undesired frequency components at relatively low levels comprising the steps of: generating a secondary modulating pulse, generating a primary modulating pulse having a gradual rise and a gradual decay and beginning after the beginning of the secondary modulating pulse and ending before the end of the secondary modulating pulse, generating a continuous wave radio frequency signal, feeding said continuous wave signal into the input of the driver stage of a two-stage radio frequency amplifier including a driver stage and a final amplifier stage, modulating the driver stage of the two-stage radio frequency amplifier with said secondary modulating pulse, and modulating the final amplifier of said two-stage radio frequency amplifier with said primary modulating pulse.
Claim 15
Independent Claim
122 words
A method for generating radio frequency pulses with undesired frequency components at relatively low levels comprising the steps of: generating a secondary modulating pulse, generating a primary modulating pulse having a gradual rise and a gradual decay and beginning after the beginning of the secondary modulating pulse and ending before the end of the secondary modulating pulse, generating a continuous wave radio frequency signal, feeding said continuous wave signal into the input of the driver stage of a two-stage radio frequency amplifier including a driver stage and a final amplifier stage, modulating the driver stage of the two-stage radio frequency amplifier with said secondary modulating pulse, and modulating the final amplifier of said two-stage radio frequency amplifier with said primary modulating pulse.
References Cited (Backward Citations)
US3177431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |