Thanks for the info Bert. Did you find that your actual base current was
close to the predicted current (5a seems kinda low based on the numbers
from JavaTC on some medium sized spark gap coils).
On Tue, Jun 25, 2019 at 1:37 PM Bert Hickman <bert@xxxxxxxxxxxxxxxxxxxxx>
wrote:
> Hi Dan,
>
> Many years ago, I tried using an older thermocouple type RF ammeter
> (that I got at a hamfest) in series with the secondary base ground
> circuit in a 6" coil. As I recall, it was a 0-5A unit. It worked quite
> well at lower power levels, but I accidentally burned it out when trying
> to run it at slightly higher power levels. The resistance/heating
> element in the meter apparently was a bit fragile, particularly when
> trying to handle the high-current peaks from a spark-gap TC. YMMV...
>
> I had much better success using a wideband current transformer and
> oscilloscope.
>
> Bert
>
> Daniel Kunkel wrote:
> > Hello list,
> > I have been thinking about using a current meter to monitor the base
> > current of the secondary coil, mainly as a tuning aid. It appears there
> are
> > HAM radio guys that use RF ammeters, and there are even plans to build
> your
> > own, however, I wonder how accurate it would be (due to dirty EMI and
> > irregular current draw)? Has anyone tried this? Or is there a better way
> to
> > ensure the tune is spot on other than observing for best streamer
> > production?
> > Thanks,
> > ~Dan
> > Kansas City area...where the ground might be starting to dry out, but
> only
> > a little bit
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