OM POWER OM2000+ Manual page 26

R emember
Always u se T UNE k nob t o g et m aximum o utput p ower. Use L OAD k nob t o g et T UNE i ndicator o n t he
display to the middle p osition between both arrows. S imultaneously check if I s graph indicator stays
within t he b oundaries. R epeat b oth s teps m ore t imes.
Proper operation mode of FU-­‐728F requires the plate voltage to be close to 3 kV. If anode voltage
without RF power is much lower, watch the heating voltage, too. Normally, heating voltage must be
in boundaries from 8.5 to 9 V without RF signal (DSP3). Heating voltage level is a reliable indicator
of correct AC selector adjustment. If you see heating voltage lower than 8.5V without RF signal,
change primary AC voltage selector one step down (if possible). Conversely, if the voltage is higher
than 9V, try to move AC selector one step up (for example from 220 to 230 VAC). Check heating
voltage under full load (full output power), also. If the heating voltage without RF signal is OK but
under full load drops more than 1.5 V, this relates to the „soft" AC network and is solvable only by
„changing" t he A C n etwork...
Two of important information is visible –
screen current increased, but still is within
the allowed limits. Turn LOAD knob slightly
in arrows direction to get TUNE indicator
between a rrows.
Display indicates correct tuning of the
Power a mplifier.
Without R F p ower t he p late v oltage i s O K.
Without RF power the plate voltage is 2.85
kV. Check the heating voltage, too. If it is
below 8.5 V, this indicates the need to
change AC selector position one step down
(for e xample f rom 2 30 t o 2 20 V AC).
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