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The amplifier is prepared for operation with the following automatic steps:
•
Toroidal transformers are switched on step by step.
•
The cooling blower for the final tube is switched on.
•
The multi-meter bar graph measures the high voltage; the normal value is
3.3 KV
•
The WAIT LED lights up.
CAUTION
After switching on, please confirm that the blower is operating properly. Air must be
flowing from the ventilating aperture above the tube. If there is any concern, or no air
flow, press the “OFF” button immediately!
Heating of the tube takes about
180 seconds
. After this time the WAIT LED goes out and the
amplifier is ready for operation.
Enter
TUNE
mode. Depending on the input power level and antenna parameters, two situations
can occur.
First
, when your antenna parameters are close to real 50 Ohms, and input power
not exceeds allowed maximum, PA stay in OPR mode and you will see the output power. You
have to do just little adjustment (steps 8, 9, 12, 13) to get maximum output power.
Second
, if
your antenna parameters are not very good and input power is higher than 15watts, safety
devices will switch PA automatically to STBY. In such a case start with step 4, go thru all next
steps.
4.
Reduce the power output of your transceiver to the
minimum!
5.
Switch OPR/STBY to
OPR
position (OPR LED lights up).
6.
Choose the
TUNE
position of multimeter.
7.
Transmit and increase driver power to
cca 10W.
CAUTION
If the input power is higher than 15W and the power amplifier is not correctly tuned, the
safety devices will switch to STBY. The amplifier will automatically reset and switch back to
OPR mode after approximately 2 seconds. Meanwhile, reduce the input power.
8.
Set TUNE knob in such a way, that the TUNE-LED lights up maximum left (multimeter in
TUNE position).
9.
Set LOAD knob in such a way, that the TUNE LED on the TUNE scale lights up under the
“
V
” sign. If it is possible to obtain the LOAD in 2 positions, set the position that is
further to the right.
10.
Repeat tuning several times according to 8 and 9, output power should be abt. 400W.
11.
Increase the input power (to about 50-70W) until an output power of approximately
1500W
will be reached.
WARNING!
Input power can not exceed 100W, otherwise PA will be damaged !
12.
Repeat steps 8 and 9.
Summary of Contents for X8NOM4000A
Page 28: ...Page 28 from 38 7 1 ...
Page 29: ...Page 29 from 38 7 2 Example of connection for ELECRAFT ...
Page 30: ...Page 30 from 38 7 3 Example of connection with Yeasu ...
Page 31: ...Page 31 from 38 7 4 Example of connection with antenna switch and BPF ...
Page 32: ...Page 32 from 38 7 5 Example of connection USB micro KEYER II with IC7800 or IC7700 ...
Page 33: ...Page 33 from 38 7 6 Example of connection USB micro KEYER II with another Icom ...
Page 34: ...Page 34 from 38 7 7 Example for connection USB micro KEYER II with Yeasu or ELECRAFT ...
Page 35: ...Page 35 from 38 7 8 Example of connection PA with MicroHAM MKII MK2R etc with CI V output ...
