Others already pointed you to the right adaptors.
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I'll add that I often use iFTx with an iPhone and it works well, with a caveat: Apple places artificial limitations on the iPhone and it won't do CAT control.
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To get PTT working, you set the QMX to "VOX" as was pointed out earlier in this discussion. You may have to tweak some threshold values on the QMX to make this work smoothly.
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Further, since there's no CAT control, you have to manually select the band in the iFTx app, and set the band/frequency on the QMX. (e.g.: you set iFTx to 20m band, manually change the QMX to "14.074MHz", the standard 20m FT8 frequency) You can make this less cumbersome by saving all the FT8 and FT4 standard frequencies as on the QMX and just toggling between them.
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Note that you don't have to adjust this when you change the transmit tone. The app will adjust the tone to whatever you've set (say, "1500Hz"), similar to operating in "Fake It" mode in WSJT-x instead of full "Split" mode.
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