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Using RF Module with Switching Power Supply

Digi XStream modules require a regulated 5VDC supply. Switching supplies may be used though special care must be taken to ensure optimum performance as noise on the power supply can affect the operation of the radio. 

Most step-up and step-down switching supplies and even some RS232 level converters can introduce ripple into the power supply. The magnitude of this ripple must fall within the radio modem specification of +/-0.25V as per the manual. 

Care must be taken to ensure that the frequency components of the ripple do not affect the radio performance. Frequency components between 20kHz and 100KHz are particularly harmful to the performance of the radio. A simple L-C lowpass filter should be used to block the switching noise that otherwise may reduce the performance of the radio module. 

Ask a Digi Support Representative for additional help with this if necessary.
Last updated: Aug 08, 2017

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