Freedom R8100 SERIES, Operator'S Manual

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Figure 3.2.3-2 Duplex Mode submenu after RF Zone soft key press
Audio Zone
The R8100 Generate and Monitor modes have a variety of audio settings and encoding/decoding features,
many of which are associated with modulation of the carrier transmitted from the R8100. The
audio/modulation sources include a fixed 1 kHz tone generator, independent variable frequency Tone
A/Tone B generators, a dedicated DTMF (Dual Tone Multi-Frequency) generator, and a synthesizer for
generating various other encoding formats used in 2-way radio testing. The Audio Zone also has the
baseband filter settings for the R8100 Monitor mode. Decoding function displays for the carrier recovered
audio are primarily located in the Meter Zone.
The display presentation for the Audio Zone on the R8100 main screen changes depending on the R8100
mode. Figure 3.2.4-1 shows the Audio Zone display area with the R8100 in Generate mode. Note the
field description of “Mod Sum” towards the upper right, and that the level is in kHz. In Generate mode
this synthesizer generated composite audio modulates the internally generated RF carrier on the R8100.
The carrier modulation level is indicated in units of deviation for FM (kHz) or percent for AM. The
composite audio modulation is also available on the Mod In/Out connector.