Power!Supply - OM POWER OM2000+ User Manual

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The!output!of!the!amplifier!is!a!PiaL!circuit.!The!ceramic!capacitor!for!TUNE!and!LOAD!are!divided.!This!
enables!the!amplifier!to!be!tuned!exactly!and!makes!it!possible!to!easily!return!to!the!previously!set!
positions!after!band!changes.!
Top)view)on)the)opened)OM2000+)
Tetrode!FU728F!!!!!!Antenna!Switch!
Output!PiaL!Circuit!
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3.2. Power'Supply'
Power! amplifier! is! using! one! 3! KVA! toroidal! transformer.! A! soft! start! is! provided! using! relays! and!
resistors!(placed!on!the!switchaON!board).!The!high!voltage!is!made!by!combining!4!x!530V!AC!(total!
abt.!2950V!DC)!@!1.2A.!Each!has!its!own!rectifier!and!filter.!In!the!high!voltage!circuit,!safety!resistors!
are!employed!to!protect!the!amplifier!against!overload!(placed!on!the!power!supply!board).!
The!separated!supply!for!screen!grid!is!regulated!by!stabilization!with!MOSFET!and!delivers!abt.!330V!
DC!at!100mA.!!Control!grid!voltage!is!also!stabilized!(a120V!DC).!Change!of!stabilized!first!grid!voltage!is!
controlled!by!the!software!(EBS!for!example).!!
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Blower! !!!!!!!!!Power!Supply!Board!!!!
!!!!Tuning!Capacitor!!!!!!!!!!!!!!!Subpanel! !!!!!!!!!!!!!!!!HV!transformer!
Exhibit!6!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Page!8!!from!35!
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SwitchaON!Board)
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