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Fault Light/Switch: If you amplifier is operated in such a manner to produce excessive screen
grid current, a protection circuit will place the amplifier in a standby mode. A red light will light in
the fault switch. The amplifier can be reset into a transmit mode by pushing the red switch. A
successful reset will be indicated when the fault light turns off.
Tune Control: A 6-1 vernier drive control used to adjust the input capacitor of the pi output tank
circuit during tune up. 0 - 100 logging scales provide a means to record your tune up settings for
future reference.
Load Control: A 6-1 vernier drive control used to adjust the output capacitor of the pi output tank
circuit during tune up. 0 - 100 logging scales provide a means to record your tune up settings for
future reference.
Band Selector Switch: Selects the desired band of operation
Red LED: When lit, the amplifier has been turned on, and it has gone through its warm up cycle.
Green LED: When lit, the amplifier has been keyed and amplifying the power supplied by the
transceiver.
INITIAL POWER UP
Preset the amplifier's front panel controls as follows:
On/Off Off
Operate/Standby Standby
Multimeter PV (Plate Voltage)
Fan Fan High
ALC Adjust Full counter clockwise
Tune Control Zero
Load Control Zero
Band 160
Turn the amplifier on by placing the On/Off switch in the on position. The meter lights and blower
should immediately come on. The amplifier is now in its two minute warm up cycle. During this
warmup period, check for the following readings:
Screen (Screen Current): Zero
PV (Plate Voltage): 2.4 KV to 2.6 KV
SV (Screen Voltage): Approx. .35 KV (350 V)
IP (Plate Current): Zero
OBSERVE THE PLATE CURRENT (IP) DURING THE WARM-UP PERIOD. IF IT STARTS TO
RISE, IMMEDIATELY TURN THE AMPLIFIER OFF. THE PLATE CURRENT SHOLD NOT RISE
DURING THE WARM-UP PERIOD. CALL QRO TECHNOLOGIES FOR INSTRUCTIONS. Place
your transceiver in the CW mode or any mode that will provide a continuous carrier for tuneup.
At this time make sure that your transceivers output power level has been set to zero.
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