Omnia Omnia-6EX / EXi Installation And Operation Manual

Contents

Omnia Omnia-6EX / EXi Installation And Operation Manual Manual pdf 43 page image

Omnia-6ex Use and Operation Manual – V: 1.2043Encode (FM Mode Only)Seven parameters are set under this menu:• Composite Range• Composite Output 1• Composite Output 2• SCA Level• Pilot Injection• Pilot Phase• Stereo SeparationEncode MenuComposite Output #1, Output #2 and RangeThe Output controls individually set the level at the two separately buffered rear-panel composite outputs. WhenRange is set to Low, both Output controls will adjust between 0.66 and 5.02 volts peak to peak. When Range is setto High, both Output controls will adjust between 1.45 and 11.02 volts peak to peak. Use the jog-wheel to select themodulation level for each composite output. Once the desired peak modulation level is displayed, click the jog-wheel to set the level and return to Highlight Mode.Always use typical program material and a calibrated modulation monitor to properly set modulation. To aid quickadjustment, it sometimes helps to advance the Clipping control before adjusting the composite outputs. Note thatreference line-up tones applied at the Omnia-5EX input cannot be used since the RMS level of a steady state tonedoes not crest at 100% modulation.SCA LevelSets the SCA subcarrier deviation level. This adjustment should always be done using a calibrated modulationmonitor.Note: Adjusting the Composite Outputs changes the SCA deviation level since the two output controls areeffectively in series. Always recheck the SCA Level adjustment after making adjustments to the Composite outputs.Pilot InjectionSets the pilot level from 6% to 12%, in 0.1% steps, relative to 100% modulation. To defeat the pilot, simply adjustthe Pilot Injection control below 6% and the control indicates Off.Pilot PhaseThis parameter sets the phase relationship between the 19 kHz pilot and the 38 kHz suppressed carrier. The systemdefault is 0.0º. The performance of the DSP based digital stereo generator is theoretically perfect, however shouldthe phase need adjustment in order to offset time domain errors in the overall transmission system, the pilot phasecan be adjusted ±32º, in 2º increments. We recommend that a calibrated modulation monitor be used for thisadjustment. If one is not available, the tried and true “bow tie” method using an out-of-phase 100 Hz tone andoscilloscope will suffice. If you are not familiar with this method, contact Omnia tech support for details.