Functions Operation; If Shift Operation; Notch Filter; Agc Operation - Icom IC -765 Instruction Manual

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7-1 IF SHIFT OPERATION
ПЕ SHIFT] SWITCH
ПЕ SHIFT] CONTROL
ІЕ SHIFT IF SHIFT IF SHIFT
© Mar Center ow)
7-2 NOTCH FILTER OPERATION
7-3 AGC OPERATION
[AGC]
FUNCTIONS OPERATION
IF Shift Tuning is a system designed to electronically shift
the passband of frequencies that pass through the receiver
crystal filter.
The IF Shift Tuning is used to reduce interference from
adjacent frequency signals.
1) Push the [IF SHIFT] switch.
2) Rotate the [IF SHIFT] control either clockwise or
counterclockwise to eliminate interference.
The Notch Filter attenuates a particular frequency in the
IF passband, such as that of an interfering signal.
1) Push the [NOTCH] switch.
2) Rotate the [NOTCH] control to minimize interference.
CENTER:
9.0115 MHz
SPAN : 10 kHz
SWP : 500 ms
PBW : 300 Hz
VBW : 300 Hz
REF : 10 dB/div
The ІС-765 has a fast attack and slow release AGC system.
The transceiver maintains the peak voltage of the rectified
IF signal from the IF amplifier for a brief period of time.
OFF position:
Used when receiving a very weak signal. In this case, the
[RF] gain control is useful for reducing receiver gain.
e The S-meter does not function in the OFF position.
FAST position:
Normally used when receiving a signal with short interval
fading. Especially effective in CW or RTTY mode.
SLOW position:
Normally used when receiving a signal in SSB or AM mode.
e AGC holds audio output constant during fluctuations in
signal strength. It keeps irritating background noise from
being heard during the short pauses in speech.