Hey babydoll, did I get the connections right?  You can trust me .... this won't hurt a bit.

Ain't these just about the purtyest scopeshots you've seen?

Two log sweeps of thirty seconds, 1kHz-25MHz.

I wish my FG would go higher but to get any higher than 25MHz I'd have to dig out the HP8640B and that damned thing weighs a ton.

Quote from: TinselKoala on April 17, 2017, 12:15:23 AM
Ain't these just about the purtyest scopeshots you've seen?

Two log sweeps of thirty seconds, 1kHz-25MHz.

I wish my FG would go higher but to get any higher than 25MHz I'd have to dig out the HP8640B and that damned thing weighs a ton.

Have you looked on youtube on how to update your device by loading different characteristics, I think you can get it to think it's a spectrum analyser  PS don't blame me if it cocks it up !

Regards AG

Quote from: synchro1 on April 16, 2017, 10:28:18 PM
@Tinselkoala,

No one can trust you to hook anything up right. You can't figure out how Bedini ran his "Ferris Wheel"!

Syncro. Brad and I are moderators here. You need to put up or shut up, to put it bluntly. Either show what your arguments claim or we will have to shut you off here.

You came into this thread at page 3 and claimed that the bifi has 2 times the inductance as a normal coil. Tk proved you wrong, and I am saying you are wrong. Get it together bud and I do not want to see1, 3, 4 and 5 posts in a row of bashing. You are accomplishing nothing but wasting page space. So it has to end here. Ok?

Mags

Quote from: TinselKoala on April 16, 2017, 10:31:55 PM
How about this magic, MH: 

Here is a scopeshot of the TBF pancake coil (661 uH, F_R = 273.2 kHz) being stimulated by a sine wave at the resonant frequency. The Blue trace is the source frequency,  the Yellow trace is the voltage across the current sensing resistor as used in the previous scopeshots connected as MH specified, and the Purple trace is the signal from a "pickup coil" (actually the monofilar pancake, it was the first thing handy to grab) suspended a couple of cm away from the TBF coil. Not connected (but share the common ground of course). It is clearly getting a voltage induced in it. But the current sensing resistor on the TBF coil is showing zero voltage across the resistor, which should mean no current flowing through it. Clearly, the TBF is still generating a magnetic field that alternates at its driven frequency, otherwise it could not induce a voltage in the pickup coil. Right? 

(Inspired by Gyula's questions, thanks!)

Sweet. So the blue trace is the input on 10v scale and the purple is on a 1v scale of the pickup a couple cm away. What if it were closer and loaded, does that change the yellow trace any? Closer may change the capacitance of the bifi, is that why the couple cm spacing? Thanks for showing.

Mags