Ten-Tec TITAN III 417, Руководство пользователя

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2-4
2.5.3 SUGGESTED TUNE UP
PROCEDURE: Following is the
recommended procedure for safe and proper
tune up of the TITAN III.
A. Set the band switch to the desired band.
For 30 meter operation, use position 40B.
For 17 meters, position 15. For 12
meters, position 10.
B. Set the multimeter switch to the Ep
position.
C. After the wait LED goes out, place the
STANDBY/OPERATE switch to
OPERATE. The STANDBY/ OPERATE
switch will light and high voltage is
indicated on the multimeter (nominal
3000 VDC).
D. Set the meter switch to the Is position.
Always monitor Is (screen grid current)
with the multimeter during tune up. Use
FWD and REF positions momentarily for
checking output power. Output power
can also be monitored on the LED
bargraph power meter. Always monitor
the overdrive LEDs. Reduce drive and re-
tune the amplifer if either is lit.
E. For initial tune up you may set the TUNE
and LOAD controls to their center
positions. Alternatively you may refer to
the suggested settings in the chart in
Figure 2-1. Keep in mind that these
settings are for operation into an ideal 50
ohm load and will vary with your
installation.
F. Turn the transceiver RF output control to
between 10 and 20 watts. Note: at very
low transceiver power outputs (<10 watts)
the amplifier may not respond when
attempting to tune up. This is normal.
Increase drive power slightly and continue
tune up. IF AT ANY TIME THE TITAN
III DOES NOT RESPOND AS
EXPECTED, REMOVE DRIVE POWER
IMMEDIATELY AND CORRECT THE
PROBLEM BEFORE CONTINUING.
G. Key the transceiver and slowly increase
the drive power until you see the plate
current increase.
H. Adjust the TUNE control for a peak in
screen grid current and a peak in RF
power output. Adjust the LOAD
control for minimum screen grid
current consistant with desired power
output. You will find that these values
are not always synchronized. Choose
the lower grid current adjustment even
if the power output is slightly less.
Readjust the TUNE control for a
screen grid current and power output
peak each time you adjust the LOAD
control. There will be some
interaction between these controls.
I. Gradually increase the drive level
from the transceiver until you reach
the desired output power level while
carefully touching up the LOAD and
TUNE controls for minimum screen
grid current and maximum output
power, respectively. NEVER
EXCEED 75 MILLIAMPS SCREEN
GRID CURRENT.
J. Once you have the amplifier tuned up
and operating on the desired
frequency, you can log the LOAD and
TUNE settings in the chart provided
(Figure 2-2). These settings should be
repeatable for the same frequency,
antenna, and SWR when used in the
future.