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Re: Topband: Choke material

Subject: Re: Topband: Choke material
From: Stan K <>
Date: Sat, 9 Sep 2017 16:21:41 -0400
List-post: <>
Guy Olinger K2AV said:

"Those chokes are of a material that is designed for audio frequencies. I
can still remember the day's in my youth when I could hear the 15 kHz
horizontal sweep frequency.

I would not be using those for a frequency more than a hundred times
the frequency
they were designed for."

Sorry, but I have to disagree. Those chokes are made for the horizontal and
vertical frequencies, the horizontal being around 15 kHz. However it is a
triangle wave. With the scan going across and then the fly back (steep part
of the wave) coming back. The fly back part of the wave moves the scanning
dot back much, much faster than the sweep part of the triangle wave that
creates the line on the screen. If you were to check the timing on just the
fly back part of the wave it would be much, much higher in frequency. So
the cores would have to be suitable for a much higher frequency than 15
kHz. They would have to be suitable for the frequency of the steep part of
the triangle wave.

Hopefully I explained that in an understandable manner......

Stan K8LL
NW Ohio, USA
10-10# 76801
FP# 3255
100WattsAndAWire# 1939
Propagation is our master . . . but sometimes the master is cruel!
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