FLEX-6000 Signature Series - SmartSDR for Windows Software User’s Guide
Page 180
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37.7.4 Voice Mode Panel
• Carrier Slider: adjusts the AM Carrier Level that is used by the radio. Sliding the control to
the right will increase the carrier level while sliding to the left will decrease the level.
• Voice-Operated Transmit (VOX) button: When the VOX is on, the sound of your voice will
automatically switch the transceiver into the transmit mode. When enabled the VOX button
will illuminate blue.
• VOX Level Slider: controls the audio level at which transmit is engaged when dragging the
control to the right and decrease when dragging to the left.
• Delay slider: adjusts the delay between the end of the voice to when the radio switches back
to receive mode. Sliding the control to the right will increase the delay while sliding to the
left will decrease the delay.
• Downward Expander (DEXP): A downward expander variably attenuates the mic gain by a
certain percentage below a gain threshold setting rather than gating it on and off. This
results in filtering out background noise without the abrupt on/off or chattering of a noise
gate. The effect of a downward expander is to increase the apparent dynamic range of the
system by decreasing the gain during the relatively quiet times thereby moving the apparent
noise floor downward.
• TX Low Cut and High cut: allows the user to set the low-end cutoff and the high-end cutoff
of the transmit bandwidth. SmartSDR varies the sharpness, and therefore the latency, of the
TX filter so that the lowest latency filter is used that is consistent with the TX Low Cut value.
As the Low-Cut value approaches zero, sharper but higher latency filters are used to assure
that no signal is emitted outside of the set bandwidth.
37.7.5 Active Receiver Panel
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