ANTENTOP- 01- 2007  # 009

Lightning Tank Calculator

Very often an amateur need calculate parameters of resonator tank (see Figure 1). Certainly, there are lots programs that can do the calculations. However very quick and with acceptable tolerance amateur can do it using Table 1. The table gives value for L (in μHn) multiple to C (in pF).

Example 1: You need resonator tank for 10 MHz. Value LxC is 253.3.

So, you may use, L= 2.53 μHn and C= 100 pF.

2.53X100= 253.

Or, you may use L= 5 μHn and C= 56.6-pF.

5X56.6= 253.

Subtract from the capacitance 10- 15 pF- it is selfcapacitance L plus capacitance parts to ground. So, real C should be 238 pF(253- 15) or 41 pF ( 56- 15).

Example 2: You need resonator tank for 14 MHz. Value LxC is 129.2.

So, you may use, L= 1.0-μHn and C= 129 pF.

1.0X129= 129.

Or, you may use L= 2 μHn and C= 64.6-pF.

2X64.6= 129,2.

Subtract from the capacitance 10- 15 pF- it is selfcapacitance L plus capacitance parts to ground. So, real C should be 114 pF(129-15) or 49 pF ( 64- 15).

Table 1

LC Value