In message , rickman
writes
On 11/4/2015 8:52 AM, Ian Jackson wrote:
In message , John S
writes
On 11/4/2015 6:49 AM, Ian Jackson wrote:
In message , rickman
writes



https://www.youtube.com/watch?v=SUYI81dkEMA

When he's measuring towards the capacitor, won't the presence of his
hand be causing the loop to de-tune - hence less current?



Yes. But, is it measurable?

Being a high-Q circuit, I would think that a small amount of additional
C would cause considerable de-tuning.

Wouldn't that also give less voltage? That didn't seem to go down any.

While I'm not really looking for flaws in the experiment, I've had
another quick look, and I don't see anywhere where the voltage is being
measured. I would have expected at least the input drive (voltage,
current or power) to be monitored just to check that it didn't fluctuate
(too much).

I note that the analyser VSWR meter reading increases as the current
probe is moved towards the capacitor - but what is it measuring? Is it
measuring the SWR where the probe is - and if so, how? Is there any
reference ground connection (which I'm pretty sure an SWR meter needs)?
--
Ian