Loop capacitor
Capacitors are incredibly simple. a pair of conductive bits, separated by some dielectric media, and you just charge up that field between them until it eventually arcs if the voltage is too high. I started looking more into what material options for dielectric exist, and how changes in dielectric strength and constant. . Unfortunately while reading about capacitor dielectrics I came across a comment saying that even a small air gap between two dielectric. . The calculation that killed this path of DIY capacitors for magloops was that of power dissipation inside the dielectric material. I had seen tables of “tangent loss coefficient”, but thought that *those numbers seem small. .. . With dielectric losses understood, my choices returned to an air variable capacitor, or a vacuum variable cap. Seeing that most any size of vacuum variable cap started at $150+ on Ebay, I set out to make a simple. [pdf]
FAQS about Loop capacitor
What type of capacitor is used in a magnetic loop antenna?
In this case, a vacuum variable capacitor is used, rated to a peak current of 57 amps and a peak voltage of 5 kilovolts. The magnetic loop design leads to antenna which is tuned to a very narrow frequency range, giving good selectivity. However, it also requires retuning quite often in order to stay on-band.
What is magnetic loop calculator?
Magnetic Loop Calculator v.1.6 by KI6GD It’s a light magnetic loop antenna calculator that run on MS Windows, and allow to calculate capacitor values and voltage based on Loop circumference, conductor diameter, desired resonant frequency and the operating power.
What is ta2wk 73 high voltage butterfly capacitor?
TA2WK (old TA1LSX), 73 High Voltage Butterfly Capacitor for Loop Antennas - TA2WK (TA1LSX): Hello Everyone, Wanna build a magnetic loop antenna? Magnetic loop antenna is a compact efficient antenna that is ideal for portable operation or limited spaces and can be improvised inexpensively.
Where is a tuning capacitor located?
Similar to a separate coupling loop, it is optimally located opposite the gap in the loop, near the low impedance point of the loop. Traditionally, to allow a mag loop to tune below its natural self-resonant frequency, a tuning capacitor is shunted across the small gap.
Does a 40m loop heat a capacitor?
The initial tests of the 40m loop were very promising. During a CW contest, the 40m loop made numerous DX contacts in Europe. When running at 500W, the capacitors showed no signs of heating (SWR drift, physical warmth, etc.). I ran several computer models of this antenna, to determine the effect of differing installation heights.
What is a light magnetic loop antenna calculator?
It’s a light magnetic loop antenna calculator that run on MS Windows, and allow to calculate capacitor values and voltage based on Loop circumference, conductor diameter, desired resonant frequency and the operating power. Works either in Standard and Metric units, and let you choose on material, and loop shape, as circular, square or octagon.
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