1
Mervin L Grindahl, Quentin S Denzene: Automatic/remote RF instrument monitoring system. EnScan, Kinney & Lange, January 17, 1989: US04799059 (243 worldwide citation)

An improved automatic/remote RF instrument monitoring system including a plurality of transponders configured to operate with one of a plurality of parameter sensing instruments remotely located from an interrogate/receiver. The interrogate/receiver transmits RF transponder activation signals in the ...


2
Keith W Barnes, Rory A Smith, Mervin L Grindahl: Method and apparatus for trunked radio repeater communications with backwards compatibility. Transcrypt International E F Johnson, Schwegman Lundberg Woessner & Kluth P A, April 16, 2002: US06374115 (66 worldwide citation)

A trunked radio repeater communication system capable of use in a networked system includes a plurality of distributive switches and a unique signaling protocol and a switching protocol for interconnecting the trunked transmission communications systems into a wide area network that provides an expa ...


3
Mervin L Grindahl, George Rosar, Mark Kodet: Remotely interrogated transponder. E F Johnson Company, Dorsey & Whitney, November 22, 1988: US04786903 (58 worldwide citation)

A radio frequency transponder is provided that combines high signal sensitivity in the receive mode and variable frequency capability in the transmit mode in a low component and power efficient design. A single tuned amplifier acts as the externally quenched oscillator of a superregenerative receive ...


4
Mervin L Grindahl: Data demodulator. E F Johnson Company, Dorsey & Whitney, October 24, 1989: US04876700 (26 worldwide citation)

A unique data recovery circuit which is able to recover transmitted digital data with a data clock embedded therein. No initial timing signals are required for operation of the data recovery circuit. Instead the data clock is recovered from the received data and used to synchronize the flow of data ...


5
Keith W Barnes, Rory A Smith, Mervin L Grindahl: Trunked radio repeater communication system. Transcrypt International E F Johnson Company, Schwegman Lundberg Woessner & Kluth P A, March 4, 2003: US06529486 (26 worldwide citation)

A trunked radio repeater communication system capable of use in a networked system includes a plurality of distributive switches and a unique signaling protocol and a switching protocol for interconnecting the trunked transmission communications systems into a wide area network that provides an expa ...


6
Keith W Barnes, Rory A Smith, Mervin L Grindahl: Trunked radio repeater communication system including home channel aliasing and call grouping. Transcrypt International E F Johnson Company, Schwegman Lundberg Woesner & Kluth P A, January 27, 2004: US06684080 (24 worldwide citation)

A system for channel assignment in a trunked transmission communication system including a plurality of subscribers. A plurality of subscribers is provided home channel assignment to reduce collisions. A home channel alias is provided for home channel coverage where a designated home channel is unav ...


7
Mervin L Grindahl, Philip M Wala: High speed data interface for land mobile communication system. E F Johnson Company, Patterson & Keough, May 18, 1993: US05212714 (13 worldwide citation)

A high speed data interface unit that is fully compatible with existing, trunked, land mobile voice transceivers is provided. Data rates of up to 4800 baud using bilevel modulation are achievable without the use of dedicated data transceivers, or the designation of a dedicated data channel. The data ...


8
Keith W Barnes, Rory A Smith, Mervin L Grindahl: Trunked radio repeater communication system including home channel aliasing and call grouping. Transcrypt Internationall E F Johnson Company, Schwegman Lundberg Woessner & Kluth P A, October 12, 2004: US06804529 (9 worldwide citation)

A system for channel assignment in a trunked transmission communication system including a plurality of subscribers. A plurality of subscribers is provided home channel assignment to reduce collisions. A home channel alias is provided for home channel coverage where a designated home channel is unav ...


9
Mervin L Grindahl: Digital frequency detector. E F Johnson Company, Dorsey & Whitney, March 22, 1988: US04733169 (6 worldwide citation)

A frequency detector completely implemented with digital logic circuitry is disclosed. The frequency detector hereof employs a unique phase locked loop digitally implemented with asynchronous ripple counters, and a digitally implemented amplitude comparator and signal integrator. The detector is esp ...


10
Mervin L Grindahl, Vladimir Z Kelman, J Eric Dunn, Stuart A Froelich, Keith W Barnes: Fixed OFDM wireless man utilizing CPE having internal antenna. NextNet Wireless, December 15, 2009: US07633893 (5 worldwide citation)

A fixed wireless access system generally comprises a consumer premise equipment (CPE) unit, that is connected via an Ethernet interface to a personal computer or local area network, and a base station unit that is connected via an Ethernet interface to a network. As such, the CPE unit is preferably ...