Failed Sending I/Q Datastrom

Hi, i have the LimeSDR -Mini (Esa version) what ever i send as I/q -data , i got not with receiver what i hope.

Often i got width spreading peaks . I wan’t modulate an AM and FM Signal from Microphone.

How i can convert the stream right ?, The datas are sending with LMS_SendStream from Lime Suite Functions
works nice as transponder / repeater but not fr my own wave files with sin and cos transformation

thanks for any help
Karsten from berlin