charging choke prevents discharge of the PFN until the switch closes. The
switch is a HYDROGEN THYRATRON, which is triggered at the PRF of the radar.
When the THYRATRON fires, the PFN discharges through the pulse transformer
primary, developing a negative DC pulse with an amplitude equal to half the
voltage on the PFN. The pulse width is equal to two TDs and depends on the
PFN characteristics.
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