I am working on a system which should communicate with a ~100kHz signal, and read that low frequency channels, e.g 10kHz to 200kHz, are especially susceptible to interference.
Why is that? Are they more susceptible than say a 500Hz signal?
Electronic – Why are low frequency channels (10kHz – 200kHz) especially susceptible to interference
frequencyinterference
Related Topic
- Electronic – Why do most PWM LED displays and backlights operate at a relatively low frequency
- Does gauge size of a signal wire has an effect to its susseptability to electromagnetic interference
- Electronic – 2.4GHz Wi-Fi interference between devices in close proximity, even though they’re using completely non-overlapping channels
- Electronic – Generating a sine wave from a square wave, for a large frequency range
- Electronic – Minimum Switching Frequencies in Boost Converters
- Electronic – How to connect a switch to a microcontroller in an extremly noisy environment
- Electronic – Top layer vs mid layer for high speed ADC signal routing
Best Answer
If one is trying to send a 10kbit/second data stream modulated at 910.0MHz, the information for every bit of data will be spread out over 91,000 cycle. By contrast, if one were trying to send a 1kbit/second data stream modulated at 100kHz, each bit of data would be spread out over only 10 cycles. A lot of radio interference comes from events like the closing and opening of switches that start and stop significant currents. Each such event may be modeled as clobbering a cycle's worth of communication on all frequencies. At 910MHz, an event which clobbers one cycle's worth of communication would probably go unnoticed, but at 100kHz, it's far more significant. It wouldn't take very many such events happening close together to disrupt a bit on a 100kHz-modulated data stream.