Apollo 51000-001 Theorie der Arbeitsweise - Seite 2

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Components L1, L2, C8, C9, C10, and C11 provide impedance matching and harmonic

rejection between U2 and the PCB mounted wire loop antenna. X1 provides frequency

reference for U2.

This device does not have any adjustments which can be changed by the user.

The loop antenna generates an H field, with some E field utilizing the main PCA of the

Apollo detector and battery for additional ground.

U2 is an integrated circuit transmitter chip, with a output frequency fixed at 32 times the

crystal reference frequency. The output circuit is an open drain operated in class c mode.

The power output is controlled by the voltage at TP1. A resistor in the antenna circuit

limits the radiated field.