I got a simple RF24Audio walkie talkie example working. I'm using the sketch file provided by the RF24Audio getting started example:
Although my receiver can produce an intelligible audio transmission, it does have a very loud and distracting buzz sound in the background (edit: the sound is a 1.5kHz buzz). Here's a short video clip so you can hear what it sounds like:
I tried replacing the computer speakers with other computer speakers, with ear phones, and with an 8 ohm speaker. They all have this background buzz.
This is what my set up looks like:
I do not hear this buzz when I hook up speakers and ear phones to the A0 of the transmitter. A human voice sounds pretty good at A0. Hence, I suspect this buzz is coming from the Arduino, the nrf24l01 modules, atmosphere interference, or something else.
Can anyone suggest what it might be and what I should consider to reduce or eliminate this noise?
When I put the speakers next to several musical instrument tuners, the musical instrument tuners report the buzz I'm hearing is 1.5khz, which is between F#6 and Gb6.