What determines the transmit frequency in this 555-based transmitter

  
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Planning on basing a QRP transmitter off of this instructables project, seeing as I have a veritable plethora of 555 ics in my shack toolbox. The problem is, this transmitter is designed to operate a bit below the commerical AM band. How is the general operating frequency being set I`d like to get it set around the 1. 8 mhz band (160 meters). Much help is appreciated, as I`m going to use this to teach the other kids in the
What determines the transmit frequency in this 555-based transmitter - schematic

ham radio club at my school how to build basic transmitters. Picture of circuit:



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