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50
15
RX G
C
AI N
O NT R O L
15.1 Automatic Gain Control AGC
Fig. 70
AGC menu
Fig. 71
RF-AGC
Audio-AGC
AGC / RF-G AIN
The AGC (Automatic Gain Control) is active after power on. Its hang time is
1 second (factory default value). Manual control of the AGC system is initiated
through the AGC pushbutton. The hang time can be modified. When PT-
8000A is powered off the modified hang time is stored.
Deselect AGC by pushing the Knob RF (see Page 51)
Pushing AGC located in the cluster FUNCTION will call up the AGC menu:
Select AGC hang time 3 s; the softkey will be displayed inverse.
Select AGC hang time 2 s; the softkey will be displayed inverse.
Select AGC hang time 1 s (default value); the softkey will be displayed inverse
(as shown here).
Select AGC hang time 500 ms; the softkey will be displayed inverse.
Select AGC hang time 100 ms; the softkey will be displayed inverse.
CW Mode only: Toggles between RF-AGC (default value) und Audio-AGC
(see annotation below)
When pushing AGC the LED will not turn on! It is only switched on when AGC
is deselected by pushing knob RF (see next Page).
To prevent missing of weak signals during tuning the MAIN- or SUB-RX the
AGC hang time will be set to 100 ms automatically.
The AGC-voltage is derived from the RF-signal after it has passed the channel
filters (10.7 MHz). The DSP will narrow the passband – hence out of (DSP)-
filter signals may still derive AGC voltage. This can be annoying especially
during CW operation. The solution is to switch to Audio-AGC.
AGC is derived from the audio to overcome situations described above. This is
recommended in CW operation with small bandwidths because narrowest Xtal
filter is 500 Hz. Normal operation is RF-AGC.
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