Browse Prior Art Database

Frequency Diversity System

IP.com Disclosure Number: IPCOM000096658D
Original Publication Date: 1963-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Vinding, JP: AUTHOR

Abstract

This is a frequency diversity system shown as a three-way VHF-UHF system. The RF frequencies are sufficiently close so that, at the receiver, a single front end can be used. The inverse fading characteristic of the different RF frequencies are still manifest and, thus, communication efficiency remains high.

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Frequency Diversity System

This is a frequency diversity system shown as a three-way VHF-UHF system. The RF frequencies are sufficiently close so that, at the receiver, a single front end can be used. The inverse fading characteristic of the different RF frequencies are still manifest and, thus, communication efficiency remains high.

In the transmitter, double sideband modulation produces the three carriers, F(a), F(b) and F(c) from the three base frequencies f(1), f(2) and f(3). The modulating video signal is mixed with one of the carriers. In the receiver, a single front end heterodynes down all three carriers. This produces three corresponding intermediates f(a), f(b) and f(c), each of which is separately detected. The modulations of all three are combined to produce the video output signal.

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