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I've been using FT8 on my Yaesu FT-450D for quite some time. I decided to try to talk on phone frequencies and discovered neither one of my mics will transmit. My mics are the original hand mic and a Heil headset. I've tried all bands and cannot transmit on any of them. I had successfully talked on the radio but not now. The only change I have made was to change from a switching power supply to a linear power supply. The radio will not transmit on either supply. It only transmits in digital modes. Does anyone have any ideas?

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    $\begingroup$ How is the FT8 audio fed into your trx? What happens when you press the PTT switch on your hand microphone? $\endgroup$ – henryflower Oct 12 at 8:29
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    $\begingroup$ Hello Lyndon, and welcome to ham.stackexchange.com! $\endgroup$ – rclocher3 Oct 12 at 17:19
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    $\begingroup$ Microphone gain accidentially set to 0? $\endgroup$ – Burn Oct 16 at 17:20
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Try changing mode from DATA-USB to USB/LSB.

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    $\begingroup$ I change the mode to USB/LSB with no effect. $\endgroup$ – Lyndon Oct 13 at 14:09
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    $\begingroup$ Hello and welcome to ham.stackexchange.com! $\endgroup$ – rclocher3 Oct 13 at 15:24
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My Xiegu G90 radio has to have the output from the 8-pin connector in the back set to line instead of mic for it to transmit a digital signal into my SignalLink sound card. Could it be that the FT-450D has the same type of settings. which may need to be changed back again from line to mic to send SSB or voice.

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Lewis Duffing is a new contributor to this site. Take care in asking for clarification, commenting, and answering. Check out our Code of Conduct.
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  • $\begingroup$ Hello Lewis, and welcome to ham.stackexchange.com! $\endgroup$ – rclocher3 yesterday

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