I found that on C4FM the transmitted rx confirmation is way too long. On my OS4, its about 1,2 seconds, while on my OS3 its just 0,5 seconds, which seems absolutely sufficient to me. Any way to set this up?
Please send us a device log excerpt and a video to info@sharkrf.com which shows the longer RX confirmation. It should be 500ms also on the OS4. Note that RX confirmation will only be 500ms if your call from the transceiver does not end with a timeout.