US4162447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency synthesis method for an AM-SSB transmitter-receiver
Assignee: Cybernet Electronics Corp
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Filing: 1977-05-03
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Granted: 1979-07-24
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Expires: 1997-05-03
Abstract
Abstract A frequency synthesis method for an AM-SSB transmitter-receiver using a phase locked loop type synthesizer, having the steps of supplying a mixer with an offset frequency of an offset oscillator or a multiplied frequency thereof and an output frequency of a voltage-controlled oscillator, applying a difference signal outputted from the mixer to a variable frequency divider, and using a sum signal frequency outputted from the mixer as the local oscillation frequency of the receiver section and that of a mixer of the transmitter section where a transmitting frequency is produced.
Inventors
- 👤 Toshihiko Teshirogi
- 👤 Sumio Tsuruta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:37
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/16; H03L7/18; H03L7/183; H03L7/185; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/54
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
156 words
A frequency synthesis method for transmission and reception of AM-SSB signals using a PLL synthesizer in a AM-SSB transceiver having a transmitter section and a receiver section which comprises the steps of: during the transmission of AM and first sideband signals, supplying a mixer with an offset frequency of an offset oscillator and an output frequency of a voltage-controlled oscillator; applying a difference signal frequency outputted from said mixer to a variable frequency divider in the PLL synthesizer; using a sum signal frequency outputted from said mixer as the local oscillation frequency of the receiver section and as an input to a mixer of the transmitter section where a transmitting frequency is produced; supplying the mixer of the transmitter section with a transmitter section local oscillation frequency as a further input; and for the transmission of the other sideband signal, simultaneously shifting both the offset frequency and the transmitter section local oscillation frequency by predetermined amounts.
Claim 2
Dependent Claim
156 words
A frequency synthesis method for transmission and reception of AM-SSB signals using a PLL synthesizer in a AM-SSB transceiver having a transmitter section and a receiver section which comprises the steps of: during the transmission of AM and first sideband signals, supplying a mixer with an offset frequency of an offset oscillator and an output frequency of a voltage-controlled oscillator; applying a difference signal frequency outputted from said mixer to a variable frequency divider in the PLL synthesizer; using a sum signal frequency outputted from said mixer as the local oscillation frequency of the receiver section and as an input to a mixer of the transmitter section where a transmitting frequency is produced; supplying the mixer of the transmitter section with a transmitter section local oscillation frequency as a further input; and for the transmission of the other sideband signal, simultaneously shifting both the offset frequency and the transmitter section local oscillation frequency by predetermined amounts.
Claim 3
Dependent Claim
161 words
A frequency synthesis method for transmission and reception of AM-SSB signal using a PLL synthesizer in a AM-SSB transceiver having a transmitter section and a receiver section which comprises the steps of: during the transmission of AM and a first sideband signal, supplying a mixer with a multiple of an offset frequency of an offset oscillator and an output frequency of a voltage-controlled oscillator; applying a difference signal frequency outputted from said mixer to a variable frequency divider in the PLL synthesizer; using a sum signal frequency outputted from said mixer as the local oscillation frequency of the receiver section and as an input to a mixer of the transmitter section where a transmitting frequency is produced; supplying the mixer of the transmitter section with a transmitter section local oscillation frequency as a further input; and for the transmission of the other sideband signal, simultaneously shifting both the said offset frequency and the transmitter section local oscillation frequency by predetermined amounts.
Claim 4
Dependent Claim
161 words
A frequency synthesis method for transmission and reception of AM-SSB signal using a PLL synthesizer in a AM-SSB transceiver having a transmitter section and a receiver section which comprises the steps of: during the transmission of AM and a first sideband signal, supplying a mixer with a multiple of an offset frequency of an offset oscillator and an output frequency of a voltage-controlled oscillator; applying a difference signal frequency outputted from said mixer to a variable frequency divider in the PLL synthesizer; using a sum signal frequency outputted from said mixer as the local oscillation frequency of the receiver section and as an input to a mixer of the transmitter section where a transmitting frequency is produced; supplying the mixer of the transmitter section with a transmitter section local oscillation frequency as a further input; and for the transmission of the other sideband signal, simultaneously shifting both the said offset frequency and the transmitter section local oscillation frequency by predetermined amounts.
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) | 1982-07-23 | 1983-01-22 | 1983-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-23 | 1987-01-22 | 1987-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-23 | 1991-01-22 | 1991-07-24 | $7700.00 | Window Closed / Lapsed |