Yes, oscillations in signal boosters can affect nearby electronic devices[4][10]. Oscillation is a feedback loop that occurs when the amplified signal from the inside antenna is picked up by the outside antenna, creating a continuous loop of amplified signals[5]. This can lower the signal quality in the area, causing interference with phones and making potential signal connections worse[3].
When oscillation occurs, an unwanted AC voltage is superimposed on the DC output voltage[4]. If the oscillating output contains a high-frequency AC component, the resulting electromagnetic interference (EMI) might induce noise in neighboring devices, causing them to malfunction[4]. Additionally, a signal boosting system suffering from oscillation can interfere with the reception of any phone in the vicinity[10].
Citations:[1] https://www.wilsonpro.com/blog/commercial-cell-phone-signal-booster-oscillation-and-overload
[2] https://apps.fcc.gov/kdb/GetAttachment.html?id=IrdDP74Ab4%2FMUbyQnMOT4w%3D%3D&desc=935210+D03+Signal+Booster+Measurements+v04r04&tracking_number=20673
[3] https://www.surecallboosters.ca/post/how-to-avoid-signal-oscillation-with-your-booster
[4] https://toshiba.semicon-storage.com/info/docget.jsp?did=67687
[5] https://powerfulsignal.com/support/knowledgebase/consideration/what-is-cell-signal-booster-oscillation/
[6] https://www.researchgate.net/publication/329034021_Survey_of_Cellular_Signal_Booster
[7] https://www.signalbooster.com/blogs/news/prevent-oscillation-or-feedback-in-signal-booster-installations
[8] https://www.federalregister.gov/documents/2013/04/11/2013-07396/signal-booster-rules
[9] https://www.pta.gov.pk/assets/media/ad_cons_paper_10102020.pdf
[10] https://www.ubersignal.com/blogs/articles/how-to-prevent-oscillation-or-feedback-in-a-cell-phone-signal-booster-system