S E T U P F O R M C H A P T E R 8
Delay (ms): Time to stay in transmit after the last peak above the threshold.
Note: Due to current hardware limitations with the TR switch time, VOX will
nearly always drop the first syllable during the transition.
TX Monitor
Figure 100: Transmit Monitor AF Control
Use the TX Monitor AF control to set the value that the AF control (front console) will use during
transmission. Note that this is only functional with 4-port cards such as the Delta-44 and the Edirol FA-66.
Compression
Figure 101: Transmit Compression
Feed Forward Compression: Determines the “look forward” transmitter automatic gain setting.
Unique to DSP implementations, it allows the required gain to anticipate the level before application
rather than simply following the signal around. Raising the value will give higher average power
without raising the peaks. It helps prevent pumping and popping with large signal onsets and allows
for very high average power with low distortion. Note that depending on the microphone/sound
card combination, higher values of compression may result in distortion on the output. This setting
can be enabled by using the COMP button in the DSP group on the lower right hand section of the
front console.
Compand: The compand setting given here is really a compression setting. If you are familiar with
“μLaw”, the compression that takes place is very similar. The setting here does not correspond to
dB but to a slope of the compression algorithm near zero magnitude. In other words, how much are
we pushing the signal up at small magnitudes. As the magnitude of the input signal goes up, less
gain is applied and the fall-off of the gain is exponential in its decay. With the goal of introducing
100 FlexRadio Systems
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