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Reply to "Remote Control Audio for Rolling Stock"

Stan, I did try the experiment with an 8 ohm resistor, the range was still affected the same when a sound was playing.  I suspect you're right about the RF circuit, it doesn't have the components that I'd expect for a superhet receiver.

 

I wasn't suggesting taking advantage of the stereo in the rolling stock, that's why I figured one channel would be available for the control function. 

 

I took a look at the signals coming out of one of the DAC channels, they look like normal audio.  If they're generated with PWM, they have added filtering before the outputs.  I went pretty high frequency and didn't see evidence of full voltage excursions that I'd expect with PWM.  Here's a few samples of my test sounds at the left DAC output, I assume the right would be similar.

 

Coal loading into tender

Scope Coal Loader Sounds

 

Reefer Compressor

Scope Reefer Compressor Sounds

 

Track Running Sounds

Scope Train Track Sounds

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Images (3)
  • Scope Coal Loader Sounds
  • Scope Reefer Compressor Sounds
  • Scope Train Track Sounds

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