OM POWER OM4000A, Инструкция по эксплуатации

Страница: 25 / 36

25
After this procedure the amplifier is tuned correctly and ready to give 4000W output power in
all operation modes.
At optimal tuning and full output power a positive max. 80mA current goes through the second
grid. On 24 and 28 MHz bands optimal tuning can be achieved when one or two LEDs are lit up to
the right from the position “V”. If less output is desired you can simply decrease the load of the
transceiver.
CAUTION
Should the amplifier demonstrate any malfunctions during tuning or should it not behave in
accordance witch the description, interrupt the tuning procedure immediately and check
the amplifier! Be sure to have not done any mistakes in choosing bands or TUNE/LOAD values!
Be sure that VSWR is not higher than 2:1 and input power is LOW!
After excluding possible human mistakes you will be able to work for long time with this
amplifier!
5.3.3. Tuning Adjustment
Entering the TUNE mode is done by pressing the TUNE button. The OM4000A then switches the
transceiver to RTTY and sets the frequency to corresponding segment. By changing the values of
TUNE and LOAD capacitors we tune the PA as per manual tuning instructions (see 5.3.2.). The
optimally tuned amplifier will deliver full output without approaching the maximum Screen
Current of 80mA!
After tuning the amplifier save the settings by pressing SET and PA will automatically tune
frequency of your transceiver to next band segment.
Follow the same procedure for all bands
and segments if needed.
Dividing of bands into segments
Band (MHz) 1,8 3,5 7 10 14 18 21 24 28
Width of the segments (kHz) 15 30 30 30 30 50 60 60 70
By pressing MAN or AUTO buttons PA and
TCVR will return to standard operating
mode.