Update README.md

README.md

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 ![APK](https://img.shields.io/endpoint?url=https://apt.izzysoft.de/fdroid/api/v1/shield/com.radio.codec2talkie)
 
 # Introduction
-**Turn your Android phone into real Amateur Radio HF/VHF/UHF APRS enabled Codec2 DV (digital voice) and/or FreeDV handheld transceiver. Requires additional hardware (e.g. AFSK/LoRa), software (e.g. Direwolf) radio modem or analog transceiver with USB audio + VOX/USB CAT PTT control.**
+**Turn your Android phone into real Amateur Radio HF/VHF/UHF APRS enabled Codec2 DV (digital voice) and/or FreeDV handheld transceiver. Requires additional hardware (e.g. AFSK/LoRa), software (e.g. Direwolf) radio modem or analog transceiver with USB audio + VOX/USB CAT PTT control, such as MCHF or ICOM**
 
 For more information visit project [Wiki](https://github.com/sh123/codec2_talkie/wiki)