Bird Technologies 4331 - Manual (Page 31)

Impedance Mismatch
There may be cases where it is necessary to use the Model 43 on other than
the 50 ohm circuit for which it is designed. When using the Thruline
Wattmeter, you will be inserting a four-inch length of 50 ohm air line into
the circuit and therefore the load on the transmitter will be changed from
its original condition without the Thruline Wattmeter. If the reflected power
20 40 60 80 100 200 400 600 800 1000
Frequency In Megahertz
-1
0
-5
0
-1
0
-5
0
-1
0
-5
0
Rela
tiv
e
Res
po
ns
e
D
B
10 C
Element
100 C
Element
500 C
Element
Figure 6
Representative Frequency Response
Theory of Operation
17