TO: FILE hagen\wpfiles\430tx\newpartnumbers.wpd

FROM: Jon Hagen

Date: Jan. 9, 2003

Subject: Part numbers for components added to 430 transmitter

K333 Y switch sense relay, inside console. (see dwg "430 radar system receiver interlocks"). Powered by PS333, a 110VDC supply used only to close K333 when the y switch interlock switches on the platform are in the radar positions. The contact of K333 is used in the PA HV interlock chain (see dwg 430_106, p5)

PS333 (see K333) 110VDC power supply used only to power K333, the Yswitch sense relay.

K444 "Transmit Lock Relay", located in the plexiglass doored junction box behine the receiver racks. The coil of this relay receives 120VAC from the transmitter console when the PA HV is on. The single contact of this relay closes a loop from the receiver control chassis, which actuates a solenoid to prevent the front panel switch on that chassis from being turned from either of the Radar ANT and LOAD positions to either of the Radio Astronomy ANT and LOAD positions. Thus this solenoid prevents an operator from moving the Y switch while the high voltage is up.