Bird Technologies 4201 Series - Manual (Page 21)

VSWR Conversion
Nomograph
Using the VSWR Nomograph, determine the intersection of the forward and reflected
power values. The slanted line passing closest to this point indicates the VSWR.
10 15 20 0.5 1.0 1.5 2.0 2.5 3.0 4.0 5.0 25 30 40 50 100 150 200 300 400 500
.2
.4
.6
.8
1.0
1.2
1.4
1.6
1.8
2.0
4
6
8
10
12
14
16
18
20
VSWR=
1+
Reflected Power
Forward Power
Reflected Power
Forward Power 1
FORWARD POWER - WATTS
REFLECTED
P
OWER
-
W
A
TTS
3.0
2.5
2.0
1.6
1.5
1.4
1.3
1.25
1.20
1.16
1.14
1.12
1.10
1.09
1.08
1.07
1.06
1.05
1.8
10
4.0
VSWR
Figure 9
VSWR Conversion Nomograph
10 15 20 0.5 1.0 1.5 2.0 2.5 3.0 4.0 5.0 25 30 40 50 100 150 200 300 400 500
.01
.02
.03
.04
.05
.06
.07
.08
.09
.1
.2
.3
.4
.5
.6
.7
.8
.9
1.0
3.0
2.5
2.0
1.6
1.5
1.4
1.3
1.25
1.20
1.16
1.14
1.12
1.10
1.09
1.08
1.07
1.06
1.05
1.04
1.03
1.8
FORWARD POWER - WATTS
REFLE
C
TED
P
OWER
- W
A
TTS
10
4.0
VSWR
Figure 10
VSWR Conversion Nomograph
Operating Instructions
11