Doodle Labs Smart Radio 문제 해결 매뉴얼 - 페이지 10
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페이지 인쇄Smart Radio Trouble-Shooting
Guide
bandwidth. The operating range is reduced by 2x for every 6 dB increase in the measured noise
above the thermal nosie floor.
Power Supply Issues
Please make sure to follow the power supply requirements mentioned in your product's
datasheet. The Smart Radios have voltage and power requirements. Most AC/DC regulators
specify an output voltage, and the maximum current they can supply. The maximum power
they can supply is simply the voltage multiplied by the current (in amperes). So a 9-V, 2-A
adapter can supply 18-W of power. Additionally, for best performance, power supply lines
should
1. be short to minimize the IR drop
2. be twisted (ground and supply) to minimize their inductance
a. if they cannot be twisted, keep them as close together as possible
3. be routed in a star topology. The power lines should never be daisy-chained
a. the center of the star should be as close to the power supply as possible
Some power supplies are noisier than others. Devices such as powerful motors create supply
noise when they pull current from the source. The Smart Radios have power supply isolation
built in, but their effectiveness depends on how noisy the supply really is. If you are unsure
whether your supply is causing a problem, power the Smart radio from a separate battery.
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Fig. 3 – Spectrum Scanner results
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September 8, 2021