30
25A1090 (Rev.3)
(1) = PLL_LE @ pin 34, (2) = PLL_DATA @ pin 35, (3) = PLL_CLOCK @ pin 36
T = 1.800s: Microcontroller pin 6 (RF_GND_ON) goes from 0V to 5V. RF carrier gets
unmuted.
T = 2.000s: Tone-key is turned on. You will see a square wave (Vpp = 5V, f0=32768Hz) at
microcontroller pin 18 (TONEKEY_SQUARE).If these stages can be captured with the scope,
the microcontroller did its part to let audio go through the system. If audio is still not being
transmitted, please involve RF spectrum analyzer and oscilloscope to debug the RF and audio
stage of the transmitter.
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