Apollo 51000-001 Werkingstheorie - Pagina 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.