TYPE 2J55\ 3 Stage Marx PFN Pulse Modulator

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Brief notes: construction layout PDF

Experimental Setup (see also Pulse M odulator 3 ); using the same magnetron mount ; pulse transformer not used

MarxPFN modified with a trigger transformer (construction)

HV Pulse OUT connects to 2J55 cathode

DIY Current viewing transformer

Note: pulse transformer is NOT connected

Current viewing transformer

HV probe\ monitor magnetron cathode

Front View

DSO in screen box

Pulsed magnetron current (12 AMPs);Current viewing transformer

Pulsed cathode voltage; HV probe

2J55 purchased from Ebay

RF envelope of magnetron output using a 1N23 microwave crystal detector

DIY 6.3 vac 2J55 heater transformer; constructed from a small microwave oven transformer; winding removed; replaced with 300turns # 22 magnet wire (black winding above) and about 16 turns # 18 well insulated (white above)

Note tha the secondary output is shunted with four Panasonic 3KV 2700pF ceramic capacitors in parallel

Neon bulb RF excited (see video A)

See video of Marx in operation; note that the sparks are barely visible for 1K ohm impedance

See video of pulse to pulse repitition smoothness