Abstract: An arrangement for interconnecting a pair of hybrid integrated circuit boards mounted by means of pins in an upstanding position on a horizontally extending base circuit board in closely spaced, substantially parallel relationship, each of the hybrid circuit boards being provided with a row of contact terminals extending along the upper edge thereof together with a secondary printed circuit board having a row of downwardly directed, spring-like contact elements mounted along each side edge, the contact elements beng spaced so as to correspond with the contact terminals on the hybrid boards and with oppositely disposed contact elements being interconnected by a conductor whereby the secondary board may be detachably mounted in a horizontally extending position across the upper edges of the hybrid boards with the contact elements in each row in circuit making engagement with the adjacent contact terminals on the underlying hybrid boards thereby interconnecting the printed circuits of the hybrid boards.

Abstract: The circuit of a portable, two-way radio is selectively connected to an antenna mounted on the radio or to an external antenna by a stripline switch. The switch has a metallic ground plate mounted on the radio, an insulating strip mounted on the ground plate, and a movable metallic plate mounted on the insulating strip. The movable plate is permanently connected to the mounted antenna, and is moved by an insulating plunger. The movable plate movably engages a pin terminal which is connected to the radio circuit and which passes through the housing of the radio for connection to an external antenna connector. When the external antenna is to be connected to the radio circuit, a plug with an external antenna contact is attached to the housing. The plug antenna contact engages the pin terminal connected to the radio circuit. A projection on the plug moves the insulating plunger which in turn moves the movable plate away from the pin terminal to disconnect the mounted antenna from the radio circuit.

Abstract: A single indicator lamp is provided on a personal or portable, battery powered radio transmitter to indicate when the transmitter is operated. The lamp is connected to a circuit which senses the battery voltage (and hence charge), which causes the lamp to be energized constantly if the battery voltage is high, and which causes the lamp to be energized intermittently at a rate which decreases as the battery voltage decreases.