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EH- Antenna for the 160- meter Band

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 ANTENTOP- 02- 2010, # 014 EH- Antenna for the 160- meter Band Vladimir Kononov, UA1ACO, St- Petersburg   Credit Line: The antenna has diameter 110- mm and is 2 meter in length. The sizes are without protected enclosure (indoor variant). Antenna was calculated with help of program VK4ANW. Figure 1 shows the calculation. Figure 1 Calculation EH-Antenna for 160 meter with help VK4ANW program Here are some explanations about the antenna data.   Diameter plastic tube for the antenna is 110- mm. Standard row for the tube is: 75, 110, 165, 215- mm. If we take tube with smaller diameter 75- mm we get twice decreased Pass Band and twice increased turns in the inductor (so, losses in the inductor also highly increased). If we take tube with bigger diameter 215- mm we get twice increased Pass Band and twice decreased turns in the inductor (so, losses in the inductor also decreased). Good parameters, but antenna is too bulky! 2. Diameter of the wire in the inductor is 0.85- mm (20- AWG). It is compromise variant that depends on power (10- Wtts allowed in Russia) allowed for using and losses in the inductor. For bigger power it needs to use wire with bigger diameter.   3. Copper foil is 0.05- mm in the thickness. Thickness of the using copper foil for the EH antenna depends on power going into antenna and to mechanical strength of the foil. 0.05- mm foil should be enough for the antenna. 4. Length to the cylinder diameter is 6. I took the digit from my experience. If the digit less the 6 the Pass Band is decreased. If the digit more the 6 the antenna design going to be complicated. Page-52

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