Before revision: However, advances in electronics have come to market devices that can be controlled by a computer and allowing digital modes such as packet radio and also the use of satellite tracking, because it can continuously change the device's frequency according to the Doppler effect
After revision: .However, advances in electronics have come to market devices that can be controlled by a computer and allowing digital modes such as packet radio and also the use of satellite tracking, because it can continuously change the device's frequency according to the Doppler effect