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PREAMP/ATTENUATOR
• Push momentarily to toggle between preamp-1 and preamp-2.
– “P.AMP1” activates 10 dB preamp for HF all bands.
– “P.AMP2” activates 16 dB high-gain preamp for 24 MHz band and above.
• Push for 1 sec. to toggle the attenuator function ON and OFF.
–
What is the preamp?
• The preamp amplifies received signals in the front end circuit to improve the
S/N ratio and sensitivity. Select “P.AMP1” or “P.AMP2” when receiving
weak signals.
–
What is the attenuator?
• The attenuator prevents a desired signal from distorting when very strong
signals are near the desired frequency, or when very strong electric fields, such
as from a broadcasting station, are near your location.
Summary of Contents for IC-746PRO
Page 2: ...Front Panel Rear Panel ...
Page 3: ...Rear Panel Front Panel ...
Page 4: ...POWER Connector Accepts 13 8 V DC through the supplied DC power cable OPC 025D ...
Page 5: ...TX Indicator Lights red while transmitting ...
Page 6: ...RX Indicator Lights green while receiving a signal and when the squelch is open ...
Page 11: ...AH 4 Connector Connection for the AH 4 Automatic Antenna Tuner ...
Page 12: ...ACC Connectors Connectors used for Accessories ...
Page 18: ...Key Jack Rear Jack to be used for Keying via a Straight Key or Computer ...
Page 19: ...Data Connector Data connection for Packet operation ...
Page 34: ...PBTC Clears the Twin PBT settings when pushed for 1 sec ...
Page 37: ...Advanced Twin PBT Graphs ...
Page 39: ...LCD Breakdown ...
Page 41: ...RIT Readout Shows the RIT or TX frequency offset ...
Page 42: ...VFO Readout Indicates whether VFO A or VFO B is selected ...
Page 45: ...RIT Readout Shows the RIT or TX frequency offset ...
Page 46: ...Antenna Readout Display outlines the antenna being used Mode and Voice Scanning Conditions ...
Page 50: ...AH 4 Antenna Tuner Installation ...
Page 55: ...Common Functions Shows the status of commonly used functions ...
Page 78: ...MONITOR Set Mode Enters to monitor set mode when pushed for 1 sec ...
Page 82: ...MICROPHONE CONNECTOR Accepts the supplied or optional microphone ...
Page 83: ...AF RF SQUELCH CONTROL Concentric control for the AF Control and RF Squelch ...
Page 84: ...AF CONTROL Inner control varies the audio output level from the speaker or Headphone outputs ...
Page 93: ...NR NOTCH CONTROL Concentric control for the Noise Reduction and Manual Notch features ...
Page 114: ...Fine Scanning There are two types of Fine Scanning Fine Program Scan Fine DF Scan ...
Page 137: ...Band Scope View ...
Page 142: ...Memory Keyer Function Map ...