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FLEX-6000 Signature Series - SmartSDR for Windows Software User’s Guide

Page 179

37.7.3 Phone Transmit Control Panel

• Level bar meter: This meter shows the real-time audio input level in dB from the selected

audio input. A peak level of approximately -10 dB is the optimal target for fully modulating

the radio. Never exceed 0 dB.

• Compression bar meter: This meter shows the real-time level of compression being applied

to the input signal when the speech processor (PROC) is enabled.

• Audio Input drop down (default MIC): Clicking on the drop-down box will display and allow

for the selection of the primary audio input source. The audio input options are MIC (front

panel 8-pin Foster connector), BAL (XLR balanced input) or LINE (TRS line level balanced audio

input), ACCY (rear panel accessory connector and PC (uses the default Windows recording

sound device). The audio inputs XLR and LINE are only available on the FLEX-6500 and FLEX-

6700.

• Audio Input Gain slider control (to the left of the Audio Input drop down): Moving the slider

control to the right increases the amount of transmitter audio gain and is shown by the Level

bar meter. Moving the slider control to the left decreases the audio input gain.

• ACC button: Clicking this button will enable audio input and output on the ACC connector on

the rear of the FLEX-6000 at the same time as a different primary audio source

• DAX Button: Clicking the DAX button will enable audio input from the Digital Audio eXchange

(DAX) Transmit channel. See section 31.1.6, DAX TX Channel and Microphone Interaction

for more information on the coordination of DAX and microphones.

• Processor (PROC) button: Clicking on this button will enable the W9GR Controlled Envelope

Single Sideband (CESSB) DSP algorithm resulting in additional talk power. The speech

processor may be on or off and has three different settings when on. In the NOR or normal

setting, the processor provides minimal additional gain and simply prevents audio peaks

from clipping or producing power greater than the set level. In the DX setting, some

compression is provided to the audio to increase the overall sideband envelope which results

in a stronger signal that may be more readily heard at a distance. The DX+ setting adds even

more compression increasing your talk power or “punch” without incurring significant audio

distortion. DX+ is most effective if you increase the low-cut TX filter to between 200-400 Hz

to concentrate your talk power in the audio frequency range that has the greatest

intelligibility. This feature is available only in SSB, AM and FM modes.

• MON button: Clicking this button will enable the audio input monitor while transmitting,

allowing the operator to hear the audio signal being sent to the transmitter in real time.

• MON Slider: Moving the slider control to the right increases the monitor volume of the

transmit audio. Moving the slider to the left decreases the monitor volume.

FlexRadio Systems FLEX-6000 Signature Series User Manual

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