Embraer Phenom 300
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe
General None Reported / Taken
Aircraft
In the cruise/descent portion of the flight we were cleared to 12;000 ft MSL and on an assigned heading of 245 degrees. I was the Flying Pilot (PIC) occupying the left seat. The First Officer stated that he was going to leave comm 1 to contact [FBO] at the airport on comm 2 and I confirmed the 'transfer' of the radios stating I had comm 1. The First Officer was on comm 2 for approximately 1 minute; all the while I was monitoring comm 1. Once my First Officer stopped his communication on comm 2; tower stated our call sign and I responded. ATC stated that they tried 3 attempts to reach us. This was the first and only time I heard ATC. This was the result of the radio/comm setup in the Phenom. When the non-flying pilot utilizes comm 2 and broadcasts; it 'blocks' the ability for the other pilot to hear ATC. Once we were established in communication my First Officer stated that at times when utilizing the comm 2 Radio it will 'block' out the comm. 1 Radio; which was the case in this flight.There needs to be a radio modification of sort to remedy the 'blocked' comm 1 radio on this fleet as this is posing some issues.
During cruise; the flight crew of an Embraer 505 experienced communication issues when the First Officer used comm 2 inadvertently blocking the use of comm 1.