Telos ZephyrExpress user manual Display section, Send and Receive Meters, Lock LEDs

Display section

Send Meters LCD Display SAFE Indicator

Receive Meters Locked Indicators

Send and Receive Meters

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The SEND meters indicate the levels being sent to the audio encoders. This is important, because codecs work best when they’ve got a reasonably high signal to work with. Adjust the mixer so that most of the green LEDs below -10dB are lit during average program material, with the red LEDs flashing occasionally. As with most digital devices, 0dB is the clipping point: there isn’t any headroom above it, and this LED shouldn’t be lit.

HOT TIP!

Heavily-compressed material, such as pre-recorded commercials and most pop music, can be set with their average levels in the red area. Just make sure that peaks never light the top LED segment.

The RECEIVE meters show that audio is being received and decoded. They’re calibrated to match the send levels at the distant encoder.

HOT TIP!

ZephyrExpress provides a Far Loopback diagnostic mode to test its analog and digital conversion circuitry, and help distant studios test their codec and the line. When this mode is active, the meters are turned off; the middle LED of each meter will light steadily as a reminder that normal operation wonÕt be possible until Loopback is turned off.

Lock LEDs

These light when the receive decoder is locked onto a valid coded signal, and the distant transmitter’s coding method matches the local decoder. They’ll flash if the receive decoder is set to one Layer 3 mode, such as mono, while the incoming signal is a different Layer 3 mode. If the signal and receiver are set to totally different algorithms, or there’s no coded signal coming in, they won’t light at all. They’ll turn off and received

ZEPHYREXPRESS HARDWARE 3-5