General Aviation Electronics, Inc.

Michael E Shepperd

Claude L Henderson

A portable transceiver includes a two-piece transceiver housing which encloses a double-sided printed circuit board. The transceiver housing includes a front surface portion and a control panel portion which is integral with, but recessed below, the front surface portion. Within the control panel portion are four clearance apertures which provide operator access to the operator controls of the printed circuit board. The width and depth of the housing are suitably sized to enable the portable transceiver to be hand held in one hand while the thumb of that same hand is able to manipulate the various operator controls. These controls protrude through the various clearance apertures yet the outermost portions of the controls remain flush with to recessed below the front surface portion. The printed circuit board is a self-contained transceiver such that all wiring is completed prior to installing the printed circuit board into the transceiver housing.

Portable transceiver

A network for connecting a receiver and a transmitter to a common antenna to utilize the antenna for both transmit and receive modes of operation is disclosed, which network is suitable for either relay antenna switching or solid state antenna switching. The network includes a band pass filter coupling the transmitter output to the antenna at least during the transmit mode of operation and first and second filter junction points for coupling the antenna to the receiver. One of the first and second junction points is coupled to the receiver at least during the receive mode of operation, and includes means for inhibiting the application of the transmitter output signal to the receiver during the transmit mode of operation. When the circuit employs an antenna switching relay, this relay, typically a single pole double-throw relay, has normally closed contacts coupling the second filter junction point to the receiver, and normally open contacts closable to complete the coupling of the transmitter output to the antenna only in the transmit mode of operation. When the network is employed for solid state antenna switching, the band pass filter continuously couples the transmitter output to the antenna and the first filter junction point includes a further filtering arrangement, the frequency characteristics of which are variable with the mode of operation to allow receipt of incoming signals in the receive mode, while inhibiting the application of transmitted signals to the receiver in the transmit mode.

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Indianapolis, IN, United States of America

Michael E Shepperd