During an EMCOMM excercice one member was not decoded using Broadcast. When he transmitted the 500 Hz field in VaraHF was filled in the waterfall. However there was also a signal at around 800 Hz. I will try to enclose a photo. Does anyone have an idea of what could cause this phenomena. He did not have any microphone connected and he lowered the soundcard speaker level a lot so as not to overdrive, that did not help.
The foto was taken on a VaraHF for Winlink, so the limits for the bandwith is not shown as 500 Hz.
73/Torbjörn/SM6AYM
A sound recording may help could be over modulation which also leads to the scattering you see. Some sound devices has enabled ALC'/AGC and "Enhancements" that you need to disable at the sound device level