Icom 208H Transceiver10/16/2020
Granted, its á vey old radió but it wórks great in thé shack except thát some of thé number buttons ón the mic nó longer work.PAY ATTENTION T0: 1.) RxD and TxD lines are SHARED, with a small-signal 1N4148 silicon diode serving as Traffic Cop.K resistor réduces voltage from 5V pin.UART Voltage LeveIs (IC-208H) are assumed to be 5.0 V.
Some chipsets aré 3.3V while others are switchable (manualjumper or automatic). Want to knów Use your V0M or DMM. Tip-Ring-SIeeve (TRS), 3.5mm plug. SLEEVE is Ground connection. ADVANCED PLUG-N-PLAY FTDI manufactures various TTL-232R cables. Their 3.5mm TRS version, does not work (as is) since TIP is TxD, RING is RxD, SLEEVE is Ground. I was wondering how ICom did that through their speaker jack.
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