Avtech AVB models operate in the frequency range of 200 to 400 MHz but the AVA is tunable over the full octave while the AVB is fixed-tuned.The pulse repetition frequency of -C units is variable from 100 Hz to 1 MHz using the internal clock oscillator that is controlled by a four-position range switch and a one-turn control (a 3 MHz option is available for 1000 MHz and higher AVD units).
