PWM signal interference

[ZSF]

Hi I am new to solar, and to this forum, and I have some questions. So my system I am working on is an off-grid cellular amplifier to be used in outer villages in Africa. The frequency we are amplifying is 900MHz I believe. I read that PWM spikes from a PWM controller can sometimes cause signal interference with certain frequencies. Is there anyone that has knowledge or experience with this? It is a small system and I don't think an MPPT would be necessary, but will upgrade if needed. The controller I am using is the HQST 30A PWM Smart Solar Controller on Amazon.

[Mike90250]

PWM controllers operate in the khz range, and will mess up conventional AM radio and the lower band of SW radio. Radio frequencies about 20mhz will not see much effect. 900mhz is way far away and should not be affected

What can be a issue, is if the power supply for the radio, cannot properly filter noise from the charger. Like the whine a cheap car radio gets from the alternator in the vehicle. Also solar charging systems can see voltages from 11V - 16V. That's going to be critical if the radio conks out at 15V