I decided to occupy myself with 1000 kHz oscillator crystal transmitter temporarly until I can get a kit or assembled part 15 tranmitter. I am not going to be on 540 kHz that much, my new frequency is AM 1000 on 1000 kHz. Same programming, but a different frequency. Soon I might buy me a new AM transmitter kit and return back to AM 540 kHz.
The main reason why I have to use 1000 kHz is because the audio and stability of a crystal oscillator sounds better than the “toy” lab kit transmitter circuit. The good thing about this is that it’s narrowbanded and does not require wideband tuners to hear the audio.