The 45uL coil has a primary tapped at 1/4 turns and a link winding with low impedance ideal to use as an aerial input coil or the coil in a Hartley oscillator. The 45uL coil has minimum inductance of 24uH and maximum 55uH, it has pins 1-2 14t, 2-3 42t, so has pins 1-3 56t, and 3t secondary.