Dawnco SWITCH-R165A Manuale di istruzioni - Pagina 5

Sfoglia online o scarica il pdf Manuale di istruzioni per Relè Dawnco SWITCH-R165A. Dawnco SWITCH-R165A 9. Audio/video - if/rf relay panel

APPLICATIONS

In its simplest form, the R165A is nothing more than a multi-contact relay capable of switching away

from signal A and connecting to signal B. There are 4 independent relay sections in each R165A. All

sections of the relay are of the mechanical type with no active circuitry involved in the signal path.

Each relay in the R165A is internally divided into 2 sections – video and audio. The video section is

constructed so that its reference impedance is 75 ohms. The relay used here is a high quality RF

type so that the video section can also be used for switching RF signals up to 950 MHz (see

specifications). It should be noted that the non-selected input into the video section is terminated into

75 ohms.

The audio section has contacts enough to provide full balanced stereo audio. In addition, there are

also 2 sets of auxiliary contacts for switching additional signals such as SAP or various tally

indicators. Check specifications for ratings on these contacts. A basic schematic of one of the four

relays is shown in the following graphic.

Activation of any of the 4 relays can be accomplished by external contact closure, open collector

transistor or logic signal. In most applications, the R165A is connected to other devices that provide

the activation signal. The most popular applications for controlling the R165A are time control, LAN