Baofeng programming mac4/4/2023 The Y_TRX is used here to charge C1 to 3V3. Unfortunately, the Yaesu radio doesn't provide a low impedance voltage source output. ![]() For Q2 to work properly, its gate should be tied to 3V3. When Y_TRX goes low, Q2 assures that FTDI_RX goes low as well. D1 prevents the FTDI_TX output of the FTDI from being pulled down. When the radio wants to send back data to the FTDI, it pulls Y_TRX. The FTDI can send data to the Yaesu by pulling FTDI_TX low. This signal is pulled up internally in the radio. Yaesu connectionįor the Yaesu FT-65, the RX and TX share a common Y_TRX signal. When B_TX goes low, the FTDI_RX pin goes low as well. When the Kenwood sends data back to the FTDI-chip. D5 prevents latchup on the Kenwood RX-pin (B_TT/RX). On the Kenwood side, this is pulled up to 5V using R2. ![]() The FTDI cable sends data to the Kenwood using the FTDI_TX signal. The Kenwood plug has a separate RX and TX-signal. ![]() ![]() In the least, it serves as a demo how to protect devices in cases where it's needed. This protection might not be necessary, but it doesn't add much to the cost. This protects your radio in case you connect a powered programming cable while your radio is off. The programming includes a latch-up protection.
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