This crystal's oscillations have an amplified feedback through the base and collector (through the LC tank circuits connection to this junction). The combination of the T1 primary and capacitor C1 form what is known as an LC (inductor-capacitor) tank circuit with a tuned frequency that matches the oscillation of the crystal provided. This transmitter is a basic Pierce crystal oscillator. You can also contact myself or other members of the Amateur Radio special interest group to help you in testing your modified transmitter to ensure it complies with FCC regulations. If your interested in modifying the transmitter we produce in this class, and you have an Amateur Radio license, basic guidelines to do so will be included in an appendix. If you build the transmitter according to the directions provided here, you will be in compliance with FCC rules concerning experimental radio transmitters, even if you do not have an Amateur Radio license.
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