CHAPTER 21
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AM PROCESSING
♦ Just as with the FM section of Omnia.9, there is a test generator in the AM section that provides various tones that are
useful for system analysis and setup. Turning on any of the tones in the Test Generator dropdown menu will interrupt
normal program audio.
¸ Square: A square wave with mild low-pass filtering which can be used to adjust and pre-compensate for transmitter tilt
by connecting an external oscilloscope to the RF sample output of the transmitter.
¸ Sweep: A linear sweep that includes frequencies in the range determined by the settings of the High Pass and Low Pass
filters, and useful for adjusting transmitter EQ.
¸ 400Hz: The standard 400Hz reference tone.
¸ 60Hz Sawtooth: Useful for testing system linearity when connecting the output of the processor to the X input of an
“X/Y” ‘scope and connecting the RF sample output of the transmitter to the Y input.
¸ 60Hz Sawtooth + Detent: The same signal as the standard 60Hz Sawtooth but with a handy detent to make finding 50%
easier on the ‘scope. (Aren’t we thoughtful?)
♦ The Test Level slider adjusts the output of the test generator.
♦ Omnia.9 can accept the output of another processor, allowing it to be used as a delay-compensated, level-matched
switcher between the two devices. When the Air dropdown control is set to “AM Proc Out”, Omnia.9 is on the air.
Setting it to “Test Input” places the other processor on the air. determines whether the output of the processor or the test
generator is fed to the transmitter. Information about the processor feeding the test input can be viewed on Omnia.9’s
built-in oscilloscope and other analysis tools.
AM Night Menu
When enabled, the Night menu allows unique and independent settings for positive peaks as well as high pass and low pass
frequencies.
Night mode can be turned on manually with the Night Mode control, by setting a time-based event in the System > Scheduling
menu, or by setting a GPI function in the System > GPI > GPI menu.
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