Required equipment: Radio + 4G module

cfh

我想做一个设备，它是一个无线电的发射装置但是可以插卡的（有4g模块，也就是有网络的），这个无线电的发射装置能收到邮件或者是一些文字信号，然后这个文字信号它能自动转化成语音信号，再通过无线电信号发射出去。可以做到设备自动接收和发射，全程无人值守的。

cfh

I'm looking for guidance and suggestions from someone with experience and a good understanding of the topic.

BG6QED

There's something called "4G Cloud Broadcast" that can convert text to speech. If I could connect its audio output directly to a radio microphone cable, and then turn on the radio's Vox function, would that work? Adding a PTT (Push-to-Talk) control shouldn't be too difficult.

BG2ELG

With a Raspberry Pi, an audio cable, and a microphone (VOX), you can achieve this.

BI3WKD

BG2ELG Yes, this offers the minimum functionality for the lowest possible cost.

BG5BQB

I've been experimenting with IPPBX recently, and I'm now able to receive radio audio through the handset and send calls to the radio station. I'm also researching how to use the handset to trigger the radio station's VOX (voice activation) feature.
It feels like you and I are essentially doing the same thing – just using IP protocol to transmit audio.
I recommend the ESP32-Audio-Kit development board, which should be able to achieve the functionality you require. However, converting text to speech for broadcasting may violate the amateur radio station management regulations prohibiting the transmission of broadcasts and signals, so I suggest you reconsider.

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