January 2013
Rev A
Chapter 2 Operation
2.1 INTRODUCTION
The Locked On RF variable matching transformers are used to transform the input of 50
ohms to impedance ranging from 6 to 800 ohms over a frequency range of 500 KHz to 5
MHz.
There are several models that have different options. There are low impedance and
high impedance versions. Additionally they may be ordered with a display that indicates
forward and reflected power simultaneously and a further option allows for
‘hot
switching’ or varying the impedance while a signal is applied to the input of the unit.
See below for designators
1. HI-Z-800
– Standard High Impedance Option
a. HI-Z-800-D Option with Display
b. HI-Z-800-H Option capable of Hot Switching
c. HI-Z-800-DH Option with Display and Capable of Hot Switching
2. LO-Z-6
– Standard Low Impedance Option
a. LO-Z-6-D Option with Display
b. LO-Z-6-H Option capable of Hot Switching
c. LO-Z-6-DH Option with Display and Capable of Hot Switching
2.2. Mains Voltage
The unit accommodates AC line voltages from 100 TO 240 VAC 47
– 63 Hz
2.3 OPERATION
A line cord is supplied to form a connection between the mains supply and the rear of
the unit. Plug this into the AC input at the rear of the unit and the AC mains outlet.
2.3.1 Proceed as follows:
(i)
Ensure
there is at least 3” or 7.5 cm clearance at the rear of the unit for air
flow.
(ii)
Turn on AC
(iii)
Ensure RF input voltage is not excessive
a. 1000 Watts is the maximum that the unit can tolerate without damage.
(iv)
Connect the output of to the load.
(v)
Select the desired output impedance.
