BIRD 4410 Series User Manual

Operation
10
Determining VSWR
The Series 4410 Thruline Wattmeter is not designed to provide direct VSWR
readings. However, VSWR readings can be determined very easily by using the
provided graphs:
Following the vertical and horizontal grid, determine intersection of forward
and reverse power values. Slanted lines passing closest to this point indicate
VSWR.
1. Determine the forward and reflected power as described above.
2. Refer to the appropriate graph, figure 7 or 8, and convert the forward and
reflected power readings to VSWR. Note that the graphs convert the
readings directly to VSWR without any intermediate computations.
Figure 7 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
50
0
.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
FORW ARD POWER - WATTS
REFLECTED POWER - WATTS
10
4.0
VSWR

BIRD 4410 Series Specifications

General

Brand	BIRD
Model	4410 Series
Category	Measuring Instruments
Language	English