Emergency transmitter and method of operating the same
US4612667A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 22, 1983 |
| Grant date | Sep 16, 1986 |
| Priority date | — |
| Expiry date | Sep 22, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2001/3894
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An emergency transmitter provided with separate devices for the transmission of a first frequency and a second frequency. The transmitter is contained within a floatable housing. The transmission devices are connected via a switch to a battery. The transmission devices are comprised of a common quartz or crystal oscillator connected with frequency multipliers which are connected to drive stages and to high frequency final stages. The latter are connected to a transmission antenna which extends from the housing. Also provided is a signal generator for modulating the transmitted frequencies. A fixed-cycle control device is associated with the first and second transmission devices and alternately sets the two transmission devices into operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.