The generator provides: AM; FM; FSK and has its own built-in PULSE modulator with an on/off ratio of better than 80dB. The pulse rise/fall time better than 10nS with minimum pulse widths of just less than 20nSec. Frequency resolution is 1Hz and a 0.01dB level resolution. A full range output attenuator covering: -130dBm to +13dBm.up to 1GHz. Falling to +10dBm up to 18GHz and then +8dBm up to 20GHz.