[Chuck Schwark]

Remember, the Shadow Meter depends on the strength of the AVC action in the set. The better the aerial and ground, the stronger the stations come in and cause larger AVC voltage. The set was designed to acommodate an outdoor aerial for best performace and a driven ground.
Also, having the IF stage(s) adjusted properly vastly effects the Shadowmeter action. Poorly aligned IF causes low or nonexistant AVC voltage changes.

Chuck