I was recently chronicling my explorations with a "Frequency Finder" circuit, a "Dip Adapter" (both of which couple to a signal generator), and a Lodestar Dip Meter—all of which were behaving quite differently, in terms of helping me figure out the resonant frequency of tank circuits ( https://www.electronicspoint.com/threads/need-signal-generator-help.267975/page-2 ).
I built the Dip Adapter in a plastic box, and then decided to line the plastic box with aluminum tape. Subsequently, I discovered that the display on the signal generator indicates "dips" around the same frequencies (several), no matter what I put the dip adapter next to. (The Dip Adapter has a coil projecting from the top of the box that is meant to inductively couple to tank circuits.)
Anyway, I'm getting small dips around 360, 430, & 560 kHz. A pretty decent dip around 770 kHz. And a very big dip around 1250 kHz. Depending on what I put the dip adapter next to, those frequencies might shift a little bit. But, I'm definitely not getting the dips that I expect with a couple of test tank circuits that I made up.
Is it possible that the aluminum lining has caused the box to become a resonator and that it's interfering with the way the thing's supposed to work? Should I rip it all out? Or, could something else be going on?
Also, does anyone have a Lodestar DM-4061 Dip Meter? If so, does it work???
I built the Dip Adapter in a plastic box, and then decided to line the plastic box with aluminum tape. Subsequently, I discovered that the display on the signal generator indicates "dips" around the same frequencies (several), no matter what I put the dip adapter next to. (The Dip Adapter has a coil projecting from the top of the box that is meant to inductively couple to tank circuits.)
Anyway, I'm getting small dips around 360, 430, & 560 kHz. A pretty decent dip around 770 kHz. And a very big dip around 1250 kHz. Depending on what I put the dip adapter next to, those frequencies might shift a little bit. But, I'm definitely not getting the dips that I expect with a couple of test tank circuits that I made up.
Is it possible that the aluminum lining has caused the box to become a resonator and that it's interfering with the way the thing's supposed to work? Should I rip it all out? Or, could something else be going on?
Also, does anyone have a Lodestar DM-4061 Dip Meter? If so, does it work???