This might help I made a short video of what the set does from stone cold. It had been powered off for over 24 hours when I started recording.
As you can see, there is a picture on Channel 6, where I set my Agile Modulator, but the sound is very weak and the image is hard to maintain, and it has to he fairly close to my modulator.
All I get is a blank, soundless image on all the other channels on both bands.
After it warms up, static shows up on the other channels and the image clears up.
https://youtu.be/iSkkBkEJiZs