Several models are included in this series of instruments, varying in frequency coverage and power ratings. These include:
NS-660P 1.8–150 MHz, 1.5 kW
NS-660PA 1.8–150 MHz, 3 kW
NS-663PA 140–525 MHz, 300 watts (see chart for specifics)
NS-663PB 140–525 MHz, 300 watts (see chart for specifics)
