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display will blank and your entry will appear. When the entry is completed, press the
PBT button. Your selection will transfer to the Auxiliary Parameter display, become
activated, and the main display will automatically restore to the receiver's operating
frequency. Note that you must enter the sign (+ or -) after entering the numbers and
before pressing the PBT button. If you enter the sign first, the receiver will interpret it as
a step-tuning command and change frequency.
4-19 DUMP button: The Dump button is used to cancel normal AGC recovery time to
restore full receiver sensitivity. This feature is especially useful when attempting to copy
a weak signal in the wake of an extremely strong one, especially with slower AGC
settings in place. Dump may also be applied in special applications when the receiver is
operating under external control. When the Dump button is depressed, a status message
appears in the AGC area of the display:
When the Dump button is released, the current AGC settings will be restored.
4-20 AGC button: The AGC button is used to select AGC rate. Three pre-programmed
settings (Slow, Medium, and Fast) are available, plus a fourth fully programmable setting
(Prog). To change AGC rate, press the AGC button. It will illuminate and the Edit Knob
will be assigned to AGC menu. To step through the menu options, rotate the Edit Knob.
Each selection will spell out in the AGC area for two seconds, then become activated:
Upon activation, the display will revert to a single- letter (S M F, P) preceding the
Manual Gain control setting (See section 4-10).
To Set Up Programmable AGC: This mode provides three adjustable parameters:
Attack in dB/mS, Hang in seconds, and Decay in dB/Sec. To alter existing settings, first
press AGC to enter the AGC edit mode, Next, select 'Prog' with the Edit Knob. To begin
programming, press the AGC button a second time. The display will change, as shown
below:
1. Set Attack Time: The first displayed parameter, AGC Attack Time, will flash
alternately between ATTCK and dB/mS at 1 second intervals. To alter ATTCK, rotate the
Edit Knob through the range of available settings and choose the desired value. Attack
Time is continuously adjustable from 0.01 mS/dB to 1.00 mS/dB.
4-9
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