###### Abstract  
Radio frequency interference (RFI) analysis is crucial for ensuring the proper functioning of a radio telescope and the quality of astronomical observations, as human-generated interference can compromise scientific data collection. The aim of this study is to present the results of an RFI measurement campaign in the frequency range of 4-5.8 GHz, a portion of the well-known C-band, for the Sardinia Radio Telescope (SRT), conducted in October-November 2023. In fact, this Italian telescope, managed by the Astronomical Observatory of Cagliari (OAC), a branch of the Italian National Institute for Astrophysics (INAF), was recently equipped with a new C-band receiver that operates from 4.2 GHz to 5.6 GHz. The measurements were carried out at three strategically chosen locations around the telescope using the INAF mobile laboratory, providing comprehensive coverage of all possible antenna pointing directions. The results revealed several sources of RFI, including emissions from radar, terrestrial and satellite communications, and wireless transmissions. Characterizing these sources and assessing their frequency band occupation are essential for understanding the impact of RFI on scientific observations. This work provides a significant contribution to astronomers who will use the SRT for scientific observations, offering a suggestion for the development of mitigation strategies and safeguarding the radio astronomical environment for future observational campaigns. radio astronomy; radio frequency interference (RFI); C-band; Sardinia Radio Telescope (SRT) 20242464811103390/s2419648  
algorithms [3; 4; 5; 6; 7; 8; 9]. Additionally, it is necessary to periodically conduct specific measurement campaigns to monitor the RFI environment surrounding the telescope. Such measurements are essential for implementing appropriate mitigation procedures [10; 11; 12; 13]. Furthermore, regulatory frameworks at both national and international levels have been established to allocate and protect certain frequency bands for radio astronomy. The International Telecommunication Union Radio Regulations (ITU-RR) assigned specific windows of the entire frequency spectrum to the radio astronomy service (RAS) with the aim of ensuring that sensitive observations are not compromised by interference from other radio frequency emissions [14]. Radio receivers for radio telescopes are designed with wide bandwidths that also include the RAS bands. In this way, the analysis of the spectrum can occur in a larger field than the narrow range of the RAS bands at the cost of detecting a considerable amount of RFI. Focusing attention on the so-called C-band, generally defined as the frequency range from 4 GHz to 8 GHz, this is a vital portion of the electromagnetic spectrum used by various services, including satellite communications, radar, and wireless broadband. Within this range, the primary RAS frequencies are 4.8-5.0 GHz and 6.65-6.6752 GHz [14]. These bands are crucial for studying celestial sources such as molecular clouds, galaxies, and cosmic microwave background radiation. Because the signals generated by these sources are so weak, the RAS frequencies in the C-band are particularly vulnerable to interference from terrestrial communication systems and other man-made sources. As a result, the protection and careful management of these frequencies are essential to maintain the integrity of astronomical research, enabling scientists to continue making groundbreaking discoveries in our understanding of the universe. In Italy, the Sardinia Radio Telescope (SRT), managed by the Astronomical Observatory of Cagliari (OAC), a branch of the Italian National Institute for Astrophysics (INAF), is a sophisticated instrument capable of operating across a broad frequency range, from 300 MHz to 116 GHz [15]. Among the various cryogenic receivers installed on the telescope, one operates in the 4.2-5.6 GHz window of the C-band and is called the C-low receiver [16].