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One thing that worries me about the description for your FM CZE-o5B transmitter..
The website says “FCC Part 15 Approved.”
But read it again. It does NOT say, “FCC Part 15 Certified.”
The word “approved” has no legal definition in the case of FM Part 15 Regulations, which is FCC 15.239 gives the field strength limit for frequencies between 88 and 108 MHz, and I can guarantee that 50mW (50-milli-watts), which is the power of your transmitter, could easily be far too much.
The way to control it is to use a very weak antenna, or somehow reduce the power.
But, there is another serious thing to learn about… transmitters produce harmonics, which are frequencies above the FM band, which must be very much supressed to avoid interfering with… get ready for this.. airplane traffic!
For example, what is two-times 88Mhz? The answer is 176Mhz, which is your transmitter harmonic frequency. If you send a signal at 176Mhz and it is too strong… you will be interfering with airplane traffic control. This will bring instant knocks on the door.
That is why you need an FCC CERTIFIED transmitter for legal FM broadcasting… it keeps you safe.
Ask any questions and a bunch of us will have answers.