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[References: 8 tit.]

Development of HPM sources based on gyromagnetic nonlinear transmission lines (NLTLs) includes the appropriate filtration of the high voltage video pulse and the irradiation antenna. We present experimental results of testing of band-pass filters designed for NLTLs. The influence of a band-pass filter bandwidth on the irradiated RF peak power is discussed. Two antenna systems have been developed to irradiate RF pulses with peak power more than 1 GW. To increase the directivity of the irradiation the 4 channel splitter into four 50 Ohm loads (antenna array) has been designed and tested. The coherent parallel excitation of several NLTLs is discovered to be possible due to the low jitter - about 5% of the period of oscillations. The possibility of the elongation of the RF pulses produced in the gyromagnetic NLTLs using coupled coaxial lines with spatial dispersion is discussed.