AS-3226B/URC
VTM-01-009-RevE
Figure 4-1
VSWR Test Setup
f. Procedures.
(1) Prepare test setup as shown in figure 4-1.
(2) At 10 MHz intervals between 30 MHz and 80 MHz, inclusive, plus 88 MHz,
perform the following steps.
(a) Tune VHF generator to desired frequency as indicated on electronic counter.
(b) Tune impedance bridge for maximum reading as indicated on standing wave
indicator.
(c) Set reference level on standing wave indicator to 1.0 on SWR scale.
(d) Tune impedance bridge for minimum reading as indicated by standing wave
indicator.
(e) Read VSWR on standing wave indicator on SWR scale.
g.
Test Values. If VSWR is 3.0:1 or greater, internal damage is indicated.
h.
Corrective Action. Refer to table 5-3 for corrective actions.
Valcom Manufacturing Group Inc
9
