NST Filter and Spark Gap Resistance
Subject: NST Filter and Spark Gap Resistance
From: Terry Fritz <twftesla-at-uswest-dot-net>
Date: Sat, 31 Jul 1999 21:50:13 -0600
I was testing my spark gap without the secondary in place tonight. As it
turns out my new rotary presents about 1 ohm of resistance to the primary
circuit and not 2.5 as I thought (that was the old rotary gap resistance).
I must have done something right on the new gap :-))
I also measured the waveforms before and after my NST filter to verify that
it was working. A graphic with the details is at:
The actual noise from the gap is much higher than I expected (but I am not
surprised). However, the filter is designed to filter even the full
primary waveform (as in NST across the primary cap use) so it still does great!