Frequency synthesis method for an AM-SSB transmitter-receiver

• US 4,162,447 A
• Filed: 05/03/1977
• Issued: 07/24/1979
• Est. Priority Date: 06/30/1976
• Status: Expired due to Term

• Current Assignee: Cybernet Electronic Corp.
• Original Assignee: Cybernet Electronic Corp.
• Inventors: Teshirogi, Toshihiko, Tsuruta, Sumio
• Primary Examiner(s): Griffin, Robert L.
• Assistant Examiner(s): Masinick, Michael A.
• Application Number:
  US05/793,302
• Time in Patent Office: 812 Days
• Field of Search: 325/15, 325/17, 325/18, 325/19, 325/20, 325/21, 325/25, 325/50, 325/137, 325/330, 331/18
• US Class Current: 455/77
• CPC Class Codes: H03L 7/185 using a mixer in the loop H03L7/187 - H03L7/195 take precedence
• CPC Class Codes: H04B 1/54 using the same frequency for two directions of communication H04B1/44 takes precedence

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.

Claims

1. 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.

2. 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.