OM POWER OM2000 HF Instruction Manual page 8

Tuning instruction:
Please note:
Before starting tuning you have to check if the right antenna or a 50 Ohms
load resistance is connected at the antenna output!
Switching on the amplifier:

put the switch at the multimeter to HV position

put the OPR/STBY switch to STBY position

press the „ON" button
The amplifier is prepared for operation with the following steps:

the toroidal transformers are switched step by step.

the blower of tube is switched on.

the multimeter bargraph measures the high voltage; the normal value is 2,8 kV

the WAIT LED lights up
After switching on you have to check the functioning of the blower. Air must be blown out of the
ventilating apertures above the tube. ( If there is any failure you have to press the „OFF"-button
immediately !)
Heating the tube takes about 150 seconds. After this time the WAIT LED goes out and the amplifier is
ready for operation.
Tuning the amplifier to an output of 2000W
1. Switch BAND, TUNE and LOAD to the position according to the table:
Band
1.8
3.5
7
10
14
18
21
24
28
The tuning table available to you is made by using a dummy load! Each amplifier will have other
values depending on used frequency and antenna! Make your own list for your own antennas! Use
tuning position (see later)!
2. Reduce the power output of your transceiver to the 0.
3. Switch OPR/STBY to „OPR" position (OPR LED lights up)
Tune
45
60
44
80
72
70
32
48
25
Load
40
34
64
8
30
35
56
50
62