Analog Duplex System
Subject to Export Control, see Cover Page for details.
8-32
Soft Key Definitions
[Peak Reset ALL] Soft Key
Resets all active peak hold levels to zero.
[Peak Reset] Soft Key
Displays a soft key sub-menu that resets the peak hold on a specific meter or meters.
[Autoscale ALL] Soft Key
Sets all meter bar graphs to Auto-ranging.
[Autoscale] Soft Key
Displays a soft key sub-menu containing soft keys that set the bar graph on a specific meter or
meters to Auto-ranging.
[Noise Meters] Soft Key
Opens a soft key sub-menu that selects the measurement option to be used on the Meters Tile
for Modulation Distortion and AF Distortion measurement.
Fig. 8-25 Analog Duplex Meters Tile - SINAD Meters Selected
[Mod Meter] Soft Key
Selects type of measurement to be displayed in Modulation Meter. Selecting SNR (Signal to
Noise Ratio) enables the [SNR Meter] Soft Key
which allows user to select the type of SNR
measurement to be performed (Normal SNR or Hum & Noise).
[SNR Meter] Soft Key
Selects the type of Mod SNR measurement to be performed, either Normal or Hum & Noise. This
soft key is only available when SNR is selected on the [Mod Meter] Soft Key
.
Mod SNR Normal
When the Normal Mod SNR Meter is selected, the Test Set transmits an audio signal to a
radio under test in an ON/OFF cycle. The internal signal of the radio under test is modulated
with the audio signal it receives from the Test Set. The radio under test sends this
modulated signal back to the Test Set. The Test Set receives and demodulates the signal
received from the radio under test. The ratio of the level of the demod audio signal when the
Mod Generator is ON versus the level when the Mod Generator is OFF is the SNR reading.
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