Hello, this is a question relating to a bifilar winding around various
torroid cores. The winding was made from two pieces of #26 enamel wire
about 6 inches long and wound at 3 to 4 turns per inch. The toroids were
either size 37 or 50 and made from #43, #61, and #67 material. The wire
winding was then wound around the toroids.
The winding cores were then tested for frequency response. The #43 core
had the lowest response and the least loss, the #61 was second, and the
#67 poorest. The #43 had a loss of .4 to 1 db between 160 and 6 meters,
the #67 had a loss of 1.5 to 2.4 db.
This all seems reasonable. There is a small response glitch in response
at about 25 MHz, for about a MHz. This is common on all toroids. The
question is: What is the cause of this glitch?
The measurement system is an HP 8505a network analyser. The power is set
to -20db, the network is RF out to an mini-circuits HF splitter, one leg
to the R input and the second to channel A. The measurement system does
not have the glitch measuring other configurations.
Thanks in advance - Dan kb0qil
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