Recordings and spectrograms with the KX3

The KX3 is a great platform for recording off the air audio and making spectrograms of other Ham's transmitted audio.  The pass band of the Kx3 is perfectly flat as seen below.

The trace with the pass band set from 0 to 3.5 kc. reading white noise off of a dead band (very easy to do these days).  The radio will transmit and receive up to 4 kc band width.

The audio from the KX3 is fed into my computer which is running Hamalyzer and Audacity.  They have had the inputs balanced, and a spectrogram and a audio recording are made at the same time.  The trace is saved as a jpeg and the audio is saved as a MP3 file.  The trace can be attached to an email and sent to the Ham along with the MP3 of their audio.  The MP3 can also be re-transmitted on the spot back through the KX3 very faithfully.  The above trace is off the air on 17 meters.  The high and low frequencies are marked.  The part of the trace above 2.6 kc is band noise since the signal was only about 15 dB above the noise level.