Icom IC-R20 instruction manual Attenuator function, RF gain

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4 BASIC OPERATION

Attenuator function

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 sta- tion, are near your location. The attenuator gain is about 30 dB.

Push [ΩΩ ATT] for 1 sec. to toggle the attenuator function ON and OFF.

• “ATT” appears when the attenuator function is in use.

DUALWATCH

MAIN/SUB

POWER

 

 

BAND

VFO

MODE

MR

 

-DUP TSQL AFC

MHz

SCAN

S.MW

 

MODE FM ANL

 

 

DIAL.SEL

SWEEP

CENTER

 

 

 

 

146 010

T-SCAN

SKIP

M.N

 

 

1

2

3

SCOPE

 

 

4

5

6

0 AFC

 

PSKIP

TONE

SET

TS

 

 

7

8

9

LOCK

ATT

ATT

ATT

RF GAIN

IC Recorder

REC

“ATT” appears while the attenuator functions is in use.

RF gain

The receiver gain can be reduced with the RF gain setting. This may help to remove undesired weak signals while mon- itoring strong signals. The RF gain may be useful for setting a minimum level at which to hear signals for SSB/CW modes .

Push [≈≈ RF GAIN] for 1 sec. to enter the RF gain setting condition, then rotate [R-DIAL]to select the desired RF gain level.

Normally this setting is used with maximum level.

Push [DUALWATCH] to exit the RF gain setting condition.

[R-DIAL]

-DUP TSQL AFC

 

MODE USBANL

 

14 120

 

PSKIP

 

 

SET-RF-GAIN:MAX

 

Maximum level

 

-DUP TSQL AFC

 

MODE USBANL

RF GAIN

14 120

PSKIP

SET-RF-GAIN:5

Setting level5

19

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Contents IR20 Some frequency bands are inhibited according to version Auto write and 50 scan edge channels are includedMay occur Equipment damage may occurPrecaution Operate this device under FCC regulationsSupplied Accessories Table of Contents Batteries installation Battery pack installationQuick Reference Guide PreparationsBelt clip Swivel belt clip OptionAntenna Third-party antennas may in- crease receiver performanceCharging the battery About default settingYour first scanning ExperienceAdjusting audio level Adjusting squelch levelBasic operation Turning on the receiverSetting frequency Receive mode selectionMemory programming Selecting a memory channelProgrammed scan operation Programming scan edges Writing a memory channelSelecting a scan edge channel B Selecting a scan edge channel aStarting scan Select VFO mode Cancelling scanStarting scan Selecting a scanning typePanel Description Front, top and side panelsEPOWER KEY Power ULEFT Dial L-DIALIRIGHT Dial R-DIAL QDUALWATCH/CLEAR KEY DualwatchOr 10 MHz tuning steps p MODE/SCAN KEY Mode ScanVOLUME/DIAL KEY 1 DIAL.SEL VFO/MHz KEY VFO MHzPush for 1 sec. to enter the set mode Inputs digit ‘5’ for frequency input, memoryInputs digit ‘0’ for frequency input, memory Inputs digit ‘8’ for frequency input, memory@2STOP/PLAY ≈ QBATTERY Indicator WDUPLEX Indicators pESIGNAL Squelch Indicators Function displayRANL/NB Indicator pgs TLOCK Indicator pYAFC Indicator p USKIP Indicators pBattery INSTALLATION/CHARGING Battery installationBattery charging Battery cautionRegular charging Charging cautionCP-18A/E fuse replacement Rapid charging with the BC-156Frequency and Channel Setting Mode selectionVFO mode Memory mode/PreSet*/TV*/Weather† channelsOperating band selection 2425 Available frequency bandsSetting a tuning step Setting a frequencyTuning step selection Using the dialEditting MHz to 1260.240 MHz Using the keypadFrequency can be directly set via numeral keys Receive mode selection Lock functionSetting audio volume When a signal is receivedBasic Operation ReceivingPush and hold SQL to monitor the operating frequency Squelch level settingMonitor function Attenuator function RF gainRotate R-DIALto select Duplex SettingDuplex operation AFC function NB/ANL functionBand scope Select the sweep steps, if desiredDial function assignment Single band operationMain band selection Band exchange Operating bands table for dualwatch operationSetting audio volume Squelch level setting Lower band’s squelch adjustmentMemory channel contents Memory ChannelsGeneral description Memory channel programmingMemory bank setting Push MR S.MW for 1 sec. to set the channel into the bankMemory bank selection Rotate R-DIALto select the bank channelProgramming memory/bank name Rotate R-DIALto select the desired characterDication type from bank name or memory name Selecting memory/bank name IndicationAvailable characters Copying memory contents Push MR S.MW for 1 sec. to clear the contents Memory clearingErasing/transferring bank contents Scan Operation Scan typesFull Scan p FREQUENCY/MEMORY Skip Function pFull/band/programmed scan Select VFO mode with VFO MHzTo start the scan, release Mode Scan Scan edges programming Select memory mode with MR S.MW Release Mode Scan to start the selected scanMemory/bank/all bank scan To stop the scan, push DualwatchAuto-memory write scan During auto-memory write scanningRecalling the stored frequencies Clearing the stored frequenciesSkip channel/frequency setting Scan pause timer Push Dualwatch to exit set modeScan resume condition SETScan resume timer About priority beep function Priority WatchPriority watch types Push Dualwatch to exit set mode and start the watch Push Dualwatch to cancel the watchPriority watch operation Select the desired memory channelWhile scanning memory/bank channels VFO scan watch qSelect memory mode0Push Dualwatch to cancel the watch and scan Push Dualwatch to stop the beeps and blinking man- ually Comfortable ReceivingTone/DTCS squelch operation Tone squelch frequency/DTCS code setting Available Dtcs code listPush 8 SET Available tone frequency listDtcs polarity setting Tone scan Push 4 T-SCANfor 1 sec. to start the tone scanGeneral SET ModeExpanded set mode ON/OFF General set mode items Set mode itemsExpanded set mode items Priority watch Key-touch beepBeep output level Display backlightingPower save Noise blankerANL function AF filterNo accessible key is available, except Power and LockAM antenna selection FM antenna selectionAuto power OFF DefaultDial speed acceleration Monitor key actionScan pause timer Scan resume timerScan stop beep Turns the scan stop beep function on and OFFScope audio output Offset frequencyDuplex direction Sets the audio output function while scope operationTone frequency Dtcs codeDtcs polarity Available subaudible tone frequenciesLCD contrast can be adjusted through 15 levels Memory bank linkLCD contrast Turns weather alert function on and OFFCI-V transceive CI-V addressCI-V baud rate RPush Dualwatch to exit set mode Other FunctionsAntenna selection Selecting antennaTurn the weather alert function OFF in set mode Weather channel operationWeather channel selection Weather alert functionReceiver shows following indications Cloning using a personal computerData cloning Auto power-off function Cloning errorRecording a received audio Playing back recorded contentIC recorder Playback speed setting Recording set mode Quality settingAutomatic recording Erasing recorded audioREC Same time, but cannot erase each track independentlyPartial reset Data format Control CommandCommand table Control Command CI-V compatible transceiverFrequency Table TV channelsS.A. channels Ccir channelsChina channels NewZealand ChannelsIndonesian channels Italian channelsTaiwan channels FOT channelsVHF marine channels Weather channelsunit MHzHF CB Citizens Band channels Other communications in the USAChannels Murs channels Cable TV IRC Wireless MicrophonesGeneral aviation frequencies PMR446 channels unit MHz LPD Low Power Device channels Unit MHzOther communications- other countries UHF C.R.S Citizen Radio Service channels Maintenance TroubleshootingSpecifications GeneralOptions OptionsDriver Installation For Microsoft Windows XPDriver Installation Windows starts installing the USB driver After the installation is completed, click Finish 0Repeat step e to yFound New Hardware Wizard will come up as below. Click Next For Microsoft Windows2After clicking Finish, the dialog appears as below Select Click Driver Installation For Microsoft Windows 98/98SE/Me Select Click COM port confirmation Click the Device Manager Pocket Guide IR20Release Mode Scan to start scan Declaration Conformity We Icom Inc. Japan#07 France Kamiminami, Hirano-ku, Osaka 547-0003, Japan