FlexRadio Systems Flex-3000 User Manual

S E T U P F O R M C H A P T E R 4
 Attack (ms): This sets the time constant for the attack for the AGC, When a signal gets
stronger, this determines how quickly the AGC will respond to the need for decreased gain. Note
that in order for this and the two controls below it to be enabled, the AGC control on the front
panel must be set to Custom.
 Decay (ms): This sets the time constant for the decay for the AGC. When a signal gets
weaker, this determines how quickly the AGC will respond to the need for increased gain.
 Hang (ms): To keep the AGC system from adjusting too much, an adjustable hang time is
provided. This Hang time will only be applied if the signal level is above the Hang Threshold
(see below), otherwise a fixed “Fast Hang” time of 100ms is applied. After this time has
expired, the Decay will then determine how quickly the AGC gain recovers.
 Hang Threshold: The Hang will NOT occur if the signal is weaker than this threshold. Instead
the “Fast Hang” will be applied.
 Fixed Gain: When you choose Fixed AGC on the front panel, this control is used to amplify the
signal.
Table 7 details the AGC parameters used in the various settings.
Table 7: AGC Setting Details
Setting Attack Decay Hang Fast Hang
Fast 2ms 100ms 100ms 100ms
Med 2ms 250ms 250ms 100ms
Slow 2ms 500ms 500ms 100ms
Long 2ms 2000ms 750ms 100ms
Leveler
The Leveler is intended to even out the variations in input to your microphone caused by varying
distance from or angle presented to it. It is an attempt to “level” the amplitude presented to the rest of
the DSP audio processing. The leveler is disabled in DIGU and DIGL modes.
ALC
The ALC is what you would typically consider ALC to be in a transmitter. It is an attempt to prevent
overdrive of the amplifier and the distortion that would accompany that. Because of the dual track AGC
algorithm we use, this ALC will allow very high average power while maintaining peaks at a controlled
level. The Compander (DX and CPDR on the Front Console (see Mode Specific Controls – Phone on
page 44) work very well with the ALC to increase average power without overdrive.
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FlexRadio Systems Flex-3000 Specifications

General

Brand	FlexRadio Systems
Model	Flex-3000
Category	Transceiver
Language	English