Masthead control system

• US 7,739,973 B2
• Filed: 04/20/2005
• Issued: 06/22/2010
• Est. Priority Date: 04/20/2005
• Status: Expired due to Fees

• Current Assignee: Airmar Technology Corporation (Amphenol Corporation)
• Original Assignee: Airmar Technology Corporation (Amphenol Corporation)
• Inventors: Jeffers, Robert K., Tancrell, Roger H., Boucher, Stephen G.
• Primary Examiner(s): SWINEHART, EDWIN L
• Application Number:
  US11/110,979
• Publication Number:
  US 20060236910A1
• Time in Patent Office: 1,889 Days
• Field of Search: 731/78.R, 73181-187, 741/65.B, 741/15, 114/90, 114/144.RE, 701/21, 343/709, 343/710, 340/984
• US Class Current: 114/90
• CPC Class Codes: G01W 1/04 giving only separate indications of the variables measured
• CPC Class Codes: G08C 19/00 Electric signal transmission systems G08C17/00 takes precedence

Abstract

A masthead control system and method are provided for a sailing vessel to reduce the number of cables running inside the mast to a single coaxial cable carrying power, control and data signals, and VHF radio signals. The coaxial cable connects an antenna directly to a VHF radio communications device such that radio communications are always available in case of emergency. The system comprises an instrumentation center that connects to the masthead; at least one masthead device that connects to the instrumentation center; and a cable, such as a coaxial cable, that connects the instrumentation center to an interface unit located in the hull. The cable carries power, at least one radio frequency signal, and at least one data or control signal between the instrumentation center and the interface unit.

Claims

1. A masthead control system for a sailing vessel, comprising:

an instrumentation center for mounting on a masthead;

at least one masthead device coupled to the instrumentation center; and

an interface unit coupled to the instrumentation center over a single cable, the interface unit providing power, at least one radio frequency signal, at least one data signal and at least one control signal to the at least one masthead device through the instrumentation center, with the power, the at least one radio frequency signal, the at least one data signal and the at least one control signal existing on the single cable between the interface unit and the instrument center and the power being provided to the at least one masthead device without influencing the at least one radio frequency signal.

2. The masthead control system of claim 1, wherein the at least one masthead device includes at least one of a VHF antenna, an FM radio antenna, a GPS antenna, a cellular antenna, a mechanical wind vane, an electronic wind vane, a temperature sensor, a pressure sensor, an inclinometer, a relative humidity sensor, a heater, a compass, a plurality of illumination lights, and a plurality of vessel running lights.

3. The masthead control system of claim 1, wherein the cable is a coaxial cable.

4. The masthead control system of claim 1, wherein a VHF radio device connects directly to a VHF antenna through the cable to provide continuous VHF radio communication services even if other components of the masthead control system malfunction or fail.

5. The masthead control system of claim 1, further comprising a control center coupled to the interface unit, the control center in communication with the at least one masthead device.

6. The masthead control system of claim 5, wherein the control center includes control circuitry for operating the at least one masthead device.

7. The masthead control system of claim 5, wherein the control center includes the interface unit.

8. The masthead control system of claim 1, wherein the interface unit comprises:

a first tuned circuit tuned to a first frequency associated with the radio frequency signal and coupled to the cable; and

a power source coupled to the first tuned circuit, the power source providing power to the at least one masthead device without influencing the radio frequency signal.

9. The masthead control system of claim 8, wherein the first tuned circuit is responsive to VHF marine band frequencies.

10. The masthead control system of claim 8, wherein the first tuned circuit is a double tuned circuit.

11. The masthead control system of claim 8, wherein the interface unit further comprises a tone generator coupled to the first tuned circuit, the tone generator generating at least one tone signal for controlling the at least one masthead device.

12. The masthead control system of claim 11, wherein the at least one tone signal is within a frequency band between 5 kHz and 50 kHz.

13. The masthead control system of claim 8, wherein the interface unit further comprises a transceiver circuit tuned to a second frequency associated with the data signals and coupled to the first tuned circuit, the transceiver circuit sending and/or receiving data signals to and/or from the at least one masthead device.

14. The masthead control system of claim 13, wherein the interface unit further comprises a second tuned circuit coupled to the transceiver circuit and the first tuned circuit, the second tuned circuit tuned to the second frequency associated with the data signals, the second tuned circuit allowing only the data signals to pass through to and/or from the transceiver circuit.

15. The masthead control system of claim 8, wherein the interface unit further comprises a first wireless transceiver circuit in wireless communication with a second wireless transceiver circuit, the second wireless transceiver circuit coupled to the at least one masthead device for sending and/or receiving data and/or control signals to and/or from the at least one masthead device.

16. The masthead control system of claim 1, wherein the instrumentation center comprises a first tuned circuit, the first tuned circuit tuned to a first frequency associated with the radio frequency signal and coupled between the cable and the at least one masthead device, the first tuned circuit preventing other instrumentation center circuitry from influencing the radio frequency signal.

17. The masthead control system of claim 16, wherein the first tuned circuit is a double tuned circuit.

18. The masthead control system of claim 16, wherein the first tuned circuit is responsive to VHF marine band frequencies.

19. The masthead control system of claim 16, wherein the instrumentation center further comprises at least one switching circuit, the at least one switching circuit coupled to the first tuned circuit and responsive to at least one corresponding tone signal to control at least one corresponding masthead device.

20. The masthead control system of claim 16, wherein the instrumentation center further comprises a transceiver circuit, the transceiver circuit coupled between the first tuned circuit and the at least one masthead device, the transceiver circuit tuned to a second frequency associated with the data signals, the transceiver circuit sending and/or receiving data signals to and/or from the interface unit.

21. The masthead control system of claim 16, wherein the instrumentation center further comprises a first wireless transceiver circuit in wireless communication with a second wireless transceiver circuit, the first wireless transceiver circuit coupled to the at least one masthead device for sending and/or receiving data and/or control signals to and/or from the interface unit.