In this video sample, Boondock Echo is listening tand captures the audio.

Boondock is connected to the Radio with a custom-made cable. Audio out on the Radio is much higher voltage than the mic in, so we use resister divider-based audio attenuation.

In the first example, Baofeng Radio is tuned and listens to NOOA Weather radio. Weather radio transmits audio continuously. 

In the second example, we are using second radio to transmit. The Radio has a Dummy load attached as an antenna so as not to transmit to nearby stations.