Icom IC-208H Adjusting the transmit signal output from TNC, Increase the TNC output level

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DAdjusting the transmit signal output from

the TNC

When setting data transmission speed to 9600 bps, the data signal coming from the TNC is applied exclusively to the in- ternal limiter circuitry to automatically maintain band width.

NEVER apply data levels from the TNC of over the accept- able level below, otherwise the transceiver will not be able to maintain the band width and may possibly interfere with other stations.

1.When using a level meter or synchroscope, adjust the TX audio output level (DATA IN level) from the TNC as follows.

2	Vp-p (1 Vrms)	: recommended level
1	Vp-p–3 Vp-p (0.5–1.5 Vrms)	: acceptable level

2.When NOT using a measuring device. q Connect the transceiver to a TNC.

w Enter a test mode (“CAL,” etc.) on the TNC, then trans- mit some test data.

e When the transceiver fails to transmit the test data or

transmits sporadically (TX indicator doesn’t appear or ﬂashes):

- Decrease the TNC output level until the transmit indi- cator lights continuously.

When transmission is not successful even though the TX indicator lights continuously:

- Increase the TNC output level.

OTHER FUNCTIONS 11

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Contents I208H May occur Word Definition RwarningEquipment damage may occur Personal injury, ﬁre or electric shockOperate this device under FCC regulations PrecautionSupplied Accessories Dtmf Memory Encoder Quick Reference Guide InstallationInstallation methods Location Using the mounting bracketDrill 4 holes where the mounting bracket is to be installed Separation cable connection Microphone connectionConnect the supplied microphone as illustrated below Detach the controller as belowWhen using the optional MB-65 Optional MB-58 installationDrill 2 or 4 holes where the bracket is to be installed DC power supply connection Battery connectionConnecting to a DC Power Source Connecting to a DC Power SupplyAntenna connector Antenna installationAntenna uses a PL-259 connector Antenna locationIC-208H has 2 m and 70 cm transmittable bands Your ﬁrst contactPush Band to select the desired frequency band You can select the desired frequency band from the HM-133Tune the frequency Repeater operation Setting duplexPush and hold S.MWMW for 1 sec. to program Programming memory channelsPush Func then CLR AMW Front panel- controller Panel Description4CONTROLLER Release Latch 0MEMORY/CALLPRIORITY Switch M/CALLPRIO2BAND Switch Band WDUPLEX Indicators p QTRANSMIT IndicatorETONE Indicators Function display5S/RF Indicators 2MEMORY Channel Number Indicators6OUTPUT Power Indicators 7BUSY IndicatorAntenna Information Rear PanelData Jack PIN Assignment Microphone HM-133 0BAND Switch Band1MEMORY/CALL Switch MR/CALL Holding Microphone keypadCancels the scan or priority watch Ming Cancels frequency entryAtion is performed Ing the a to D, # and MkeysOptional Microphones HM-118N/TN/TAN DTurning power ON/OFF Setting a FrequencyPreparation Dvfo and memory modesUsing the keypad Using the tuning dialUsing the Y/Z keys Push Setlock to enter set mode Tuning step selectionLock functions Switch the microphone keypad lock functionFrequency lock DMicrophone keypad lockReceiving Basic OperationMonitor function SQL Y DMUTE/ SQL Z #16KEY-L, respectivelySquelch attenuator Push PWR to exit initial set modeTransmitting Selecting output powerRF Indicator Power Output Push PTT to transmit and push again to re- ceive One-touch PTT functionAudio mute function General Repeater operation ﬂow chartRepeater Operation Release PTT to receive Accessing a repeaterPush and hold PTT to transmit Push Simp 9TSQL to return to simplex opera- tion Set the receive frequency repeater output freSubaudible tone frequency list Subaudible tonesSubaudible tones Hz tone Dtmf tonesPush Y or Z to set the desired offset Offset frequencyPush Band to select the desired frequency SET band Frequency range Duplex direction Setting the auto repeater function ON/OFFFrequency range and offset direction Memory channel selection Memory OperationGeneral description Push S.MWMW for 1 sec. to program Programming a memory channelRotate Dial to select the memory channel to be pro- grammed Programming a memory channel via the microphone Copying memory contents Memory/callmemory/call Example Transferring memory channel 30 contents to channelSelect the memory/call channel to be transferred Rotate Dial to select the target memory channelProgramming channel names Rotate the tuning dial to select the desired characterPush Then push To select the channel. Push Push SET BD-OFF or ENT CT-OFF until ANM appear DTo indicate the channel namePush S.MWMW momentarily, then push S.MWMW again for 1 sec Memory clearingRotate Dial to select the memory channel to be cleared Push Y/Z to select the desired contents in the bank Rotate Dial to select the contents in the bankMemory bank selection Rotate Dial to select the desired bank, a to JOry channel via Y/Z or keypad Memory bank settingPush MR/CALL then select the desired mem Transferring bank contents Call channel transferring Call Channel OperationCall channel selection Programming a call channel Scan types Scan OperationMemory mode for memory scan Push VFO/LOCK to select VFO mode forScan start/stop PreparationExample Programming 145.300 MHz into scan edges 1A Scan edges programmingProgramming scan edges via microphone Select a memory channel Skip channel settingPush Monidtmf to exit set mode Scan resume condition Rotate Dial to set the desired timerOrity watch starts Priority WatchPriority watch types Push MR/CALL, then push Scan 2 to start the memory scan Priority watch operationPush M/CALLPRIO for 1 sec. to stop the watch Programming a Dtmf code Dtmf Memory EncoderPush Monidtmf for 1 sec. to turn the Dtmf encoder on Push Monidtmf to exit Dtmf memory programming conditionPush VFO/LOCK to exit the programming condition Push Func then LOW 6DTMF to turn Dtmf Dtmf encoder onTransmitting a Dtmf memory directly Transmitting a Dtmf codeAutomatic transmission Dtmf memory Push DTMF-S again to deactivate the Dtmf direct selection Manual transmissionMentarily, then push the desired Dtmf keys A to F Pocket beep operation Pocket Beep and Tone SquelchWaiting for a call from a speciﬁc station Lect the Dtcs polarityAvailable tone frequency list Calling a waiting station using pocket beepTone/DTCS squelch operation Selects the tone type to be scanned Tone scanPush TONET-SCAN for 1 sec. to start the tone scan Other Functions Set modeDisplay color Display dimmerRepeater tone Tone squelch toneDtcs code Tuning stepOffset frequency Dtcs polarityMemory name setting Scan resume timerChannel skip setting Memory bank settingBank link setting Program scan skip settingMemory bank link function Turns weather alert function on and OFFEntering initial set mode Initial set modeKey-touch beep Time-out timerDAuto power OFF Cooling fan control Squelch delayData transmission speed Microphone sensitivityNarrow TX function Active bandDtmf speed Push Band or MR/CALL to select the desired AM/FM narrow modeWeather channel operation Turn the weather alert function OFF in set modeWeather channel selection Weather alert functionMicrophone keys Default settingUP/DN keys on a microphones 1/F-2 keys on HM-133Partial reset Push Setlock on the master transceiver Cloning between transceiversCloning error Cloning using a personal computerBps packet operation Packet operationData speed Connect the transceiver and a TNC as illustrated belowOther Functions Bps high speed packet operation Increase the TNC output level Adjusting the transmit signal output from TNCProblem Possible Cause Solution MaintenanceTroubleshooting Fuse Fuse replacement20 a Speciﬁcations Specifications and OptionsDgeneral DtransmitterOPC-600/600R*, OPC-601/601R* Separation Cables OPC-347/OPC-1132 DC Power CablesOptions Mode Arrangement Mode Arrangement Kamiminami, Hirano-ku, Osaka 547-0003 Japan