MIL-DTL-3970F
4.7.2 VSWR (see 3.5). The VSWR of the assembly shall be measured over the specified frequency range (see
3.1), using the test set-up of figure 1 or figure 2 (or equivalent). Test equipment shall be capable of providing a
continuous measurement of VSWR over required frequency ranges. A means shall be provided for producing
permanent records of the assembly's VSWR versus frequency. If VSWR is not directly measured; that is, if return
loss is measured and VSWR is calculated from that measurement, the permanent record shall indicate the worst
case VSWR numerically for each frequency band and shall provide the calculation used to obtain the calculated
VSWR. The measurement system and permanent record shall provide a minimum accuracy of 0.04 dB over the
frequency ranges below 26.5 GHz and a minimum accuracy of 0.08 dB over the frequency ranges 26.5 GHz and
above.
FIGURE 1. VSWR test setup using coupled sliding load (or equivalent).
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