Marine radio telephone

Details Marine radio telephone Marine radio telephone

1977-11-04

1980-01-29

Safourek, Benedict V.

Oscillators

Relaxation oscillators

331 1A, H03B 308, H04B 140

Patent

active

041863429

ABSTRACT:
An improved marine radio telephone is disclosed which has a housing having an angular opening suitable for either above or below eye level installation and a chassis having printed wiring board support members including a tiltable front panel support member for adapting the front panel to correspond to the position of the housing when mounted therein and a rear support member for supporting the transmitter board and heat sink for improved heat dissipation. The front panel includes a keyboard having keys for selecting digits 0 to 9, an emergency channel, and weather channels, a display for displaying the channel selected, control knobs for volume and squelch control, and switches for power and U.S.A. or international channel selection. The printed wiring boards include a front panel board, a digital input/output and power board, a frequency synthesizer board, a receiver board and a transmitter board. The front panel board sends operating signals to and receives outputs from the other boards. The digital input/output board includes a digital detector means for producing binary coded numbers representative of the keys pressed, a load control means for alternately loading the binary coded numbers into a tens register and a units register, an illegal channel detector connected to the tens and units registers for detecting an improper channel selection, and a memory connected to the units register and producing in response to binary coded numbers for legal channels a synthesizer address code for the channel selected. The synethesizer board is connected to the digital input/output and power board to provide, in response to the synthesizer address code, a local oscillator signal for the receiver clearing receiver operation and an audio modulated signal for transmission during transmitter operation. A phase lock loss signal is produced for preventing illegal operation. The receiver board includes an improved squelch circuit which provides for fine tuning to eliminate noise without unnecessarily reducing the audio signal.

REFERENCES:
patent: 4013957 (1977-03-01), Tojo
patent: 4092594 (1978-05-01), Baker

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