Broadcast Tools DSC-20 Manual de Instalação descarregar pdf (Página 20)

Preliminary 8-2002 RSHD Smartcaster Installation Manual

All of the inputs on the RIDZ Switcher are balanced audio. If the SMARTCASTER or

the networks have unbalanced outputs, they need to be wired from unbalanced to

balanced.

The RIDZ is electronically balanced. The output circuit drives the "+" signal (HOT) of

the balanced lines with a signal that matches the signal coming from the innards of the

box, but that's half the volume level. The "-" signal (COLD) has the same signal size on

it, but with it's inverted: comparing the HOT with this COLD signal would show that

where there's maximum positive peaks in the HOT signal there's maximum negative

peaks in the COLD and vice-versa. When the receiving gear combines the HOT and

COLD signals (each at half the original signal's amplitude), we recover the original

signal. If we wish to hook up this E-BAL signal (HOT, COLD and ground) to an

unbalanced input, we need to be careful that we don't hook up the COLD to the RIDZs

ground like we did with transformer balanced output. Why? Because we're driving the

COLD signal with an amplifier and shorting it to ground may damage it. So how do we

hook up such an output: we connect only the ground and HOT signals. This means that

we lose half of the signal's volume, but this can be dealt with later down the signal path.

Fig 1.1. The front panel of the RIDZ Switcher

The RIDZ is generally left alone after the initial setup. On the front panel are the left and

right channel volume controls for the Program Output level and the Record Output level.

These are usually adjusted by the installing engineer and then locked down.

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Broadcast Tools DSC-20 Manual de Instalação Página 20