In this episode I let you hear the operation of my Kenwood TS940S automatic tuning unit. It had been a while since I’d last transmitted and I was a bit nervous that it might not even work – apparently it still does.
Link to my original show that had a comment from Michael
hpr2668 :: Explaining the controls on my Amateur HF Radio Part 3
Link to article about the Kenwood TS940-S
Information on the Automatic Tuning Unit located internally within the Kenwood TS940S apparently its an optional Unit with Part number AT-940
if you really want to dive into more detail about Tuning units feel free to follow this link in wikipedia.
Dipole information from wikipedia
40M band allocation information from Wikipedia
Noise Blanker information from wikipedia