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Pride DX-300 CHAPTER 2
Figure 2-1 Front Panel
2.1 OPERATION:
1) Check to see that the TUNE/STANDBY/OPERATE switch is in the center or STANDBY position. Apply power
to the unit by switching the POWER switch to the ON position. You will hear the cooling blower come up to
speed. Wait 60 seconds for the tube to come up to operating temperature.
2) During the time that the amplifier is warming up or at any time that the TUNE/STANDBY/OPERATE switch is
in the STANDBY position, the exciter may be operated normally "straight through" the amplifier.
3) Set the band switch to the same band as that the exciter is tuned to.
4) After warm up, place the TUNE/STANDBY/OPERATE switch into the TUNE position. The OPERATE
indicator will light up, indicating that the unit is ready for operation. If the RECEIVE switch is on, the RECEIVE
indicator will light also, indicating operation of the receive preamplifier.
5) Rotate the PLATE LOADING control to the nine o'clock (counter clockwise) position.
6) Apply several watts of drive from the exciter and quickly peak the PLATE TUNE control for maximum output
as indicated on the front panel wattmeter. The SCREEN overload indicator may glow at this time, and will peak
in brilliance at approximately the same place of tuning that maximum output occurs.
7) The PLATE LOADING control is then turned clockwise 1/2 division or so, and the PLATE TUNING control is
peaked again for maximum output. The brilliance of the SCREEN indicator will peak again, but not quite as
brightly as before. This process is continued until a further increase in the PLATE LOADING control will give no
further increase in power output. This will normally result in approximately 100watts output for three to four watts
of driving power.
8) Un-key the exciter, and place the TUNE/STANDBY/OPERATE switch in the OPERATE position. When the
exciter is keyed again, the power output will be somewhat higher, and the SCREEN indicator may glow brightly
again. Repeat the procedure as before, tuning the PLATE LOADING and PLATE TUNING controls alternately
for maximum output. The PLATE TUNING control should always be the last control that is adjusted. Power
output should be about 250watts for five watts drive at this point in the tune up procedure. When proper loading
is accomplished, the SCREEN indicator should glow only dimly. The plate current, as read on an external meter,
should be in the neighborhood of 200-250ma.
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