The most precise global geodetic reference frame, the International Terrestrial Reference Frame (ITRF), is based on four space geodesy techniques: Very Long Baseline Interferometry (VLBI), Satellite Laser Ranging (SLR), Global Navigation Satellite Systems (GNSS) and the Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) System. All four techniques complement each other with their observations for ITRF. In this study we focus on the co-location of two of these techniques: DORIS and VLBI. The question of how the desired co-location of DORIS at a VLBI site (or vice versa) can be achieved is under permanent discussion. The VLBI systems are designed to receive extremely faint cosmic signals down to 110 dBm, whereas the DORIS beacon emits signals at a frequency of 2,036 MHz with 40 dBm output power. There is a potential for coupling between DORIS emissions and the VLBI receiving chain generating spurious signals. The CRAF-VGOS group presents a compatibility study usin g pycraf to find in simulations the exclusion zones for a DORIS beacon located next to a VGOS radio telescope. The purpose of this study is to evaluate the electromagnetic compatibility between the DORIS and VGOS systems when they are actually or potentially co located a t the same station.