High speed, high and medium frequency communication system

Details High speed, high and medium frequency communication system High speed, high and medium frequency communication system

Filed on

1996-04-19

Date issued

1998-10-20

Examiner

Pham, Chi H.

Patent Class

Pulse or digital communications

SubClass

Transceivers

Other Related Categories

375220, 375222, 370310, 455524, 455 321, 343876, H04B 138, H04B 700, H04Q 700, H01Q 324

Type

Patent

Status

active

Patent number

058258140

Description

ABSTRACT:
A high frequency, high speed data communication system for providing electronic mail, file transferring, Internet access, weather forecasts and other database and communication options to remote HF/MF users, such as vessels at sea. A conventional, multi-featured, land-line bulletin board system is employed at a central communication facility for the provision of data communication services. A remote computer accesses an HF/MF link at the central communication facility via an HF/MF modem coupled to an HF/MF radio and antenna. The HF/MF link includes an antenna, HF/MF radio, HF/MF modem, and an interface computer for performing protocol and interface conversion between the land-line BBS and the HF/MF modem. Multi-user capability is provided through the simultaneous employment of multiple HF/MF links at the central communication facility. Multi-frequency operation of each HF/MF link is provided through the scanning of each HF/MF radio in conjunction with an antenna tuning system. The antenna tuning system provides virtually instantaneous tuning of an antenna among a predetermined set of frequencies through the switching in of one of a set of pre-tuned manual antenna tuners. A centralized scanning computer facilitates multi-frequency operation through the dynamic reallocation of assigned frequencies among the various HF/MF links so that any links which are not busy servicing users can be employed to scan available frequencies.

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