d. Avoid Mechanical Shock. SWR Autotesters
and bridges are designed to withstand years of
normal bench handling. However, do not drop or
otherwise treat them roughly. They are labora-
tory-quality devices, and like other such devices,
they require careful handling.
e. Keep SWR Autotester or Bridge Connectors
Clean. The precise geometry that makes the
SWR Autotester’s or bridge’s high performance
possible can be disturbed by dirt and other con-
taminants adhering to connector interfaces.
When not in use, keep the SWR Autotester or
bridge connectors covered. Refer to paragraph 8
for cleaning instructions.
6. PERFORMANCE VERIFICATION
Performance verification consists of measuring the
directivity of the SWR Autotester or bridge and
measuring connector pin depth.
7. DIRECTIVITY MEASUREMENTS.
Directivity measurements are frequency limited. For
frequencies 2 GHz and above an air line technique
is used to obtain a precise measurement; below 2
GHz where an air line is not effective, a go-no go test
must be used.
Table 4 lists recommended test equipment for per-
forming these measurements. Measurement proce-
dures are given below.
Measuring the directivity of 97S50 and 97SF50 SWR
Autotesters at 2 GHz and above requires use of a
19SF50 or 19S50 Air Line. The WSMA connectors on
these components are designed to mate with SMA
connectors. When mating two WSMA connectors,
compensation washers are required. The only excep-
tions are the WSMA Open/Short and the sweep gen-
erator RF OUTPUT connector, which have been op-
timized for use with WSMA. An envelope containing
six or more of these washers is packaged with each
air line. Figure 9, beginning on page 12, provides a
procedure for installing these washers.
Instrument Required Characteristics Recommended Model and Manfacturer
Scalar Network Analyzer System
Sweep Generator
Leveled Output: ±1.0 dB
Frequency Range: 2 – 18 GHz
Scalar Network Analyzer
Vertical Sensitivity: 0.5 dB/Div.
Variable Offset Control
WILTRON 562 SNA and 68147B
Synthesized Sweep Generator, with
560-10BX Cable
OR
WILTRON 5447A Scalar
Measurement System
Air Line SWR: 1.002 (GPC-7 Connector)
SWR: 1.006 (Type N/NF
Connector)
SWR: 1.006 (WSMA Connector)
WILTRON 18 Series
WILTRON 19 Series
Termination 20 dB Offset WILTRON 29 Series
Precision Termination
50
±
0.5 Ohms
GPC-7 Test Port Connector
Type N Test Port Connector
WSMA Female Test Port Connector
WSMA Male Test Port Connector
75
±
0.5 Ohms
Type N Test Port Connector
BNC Test Port Connector
WILTRON:
28A50-1
26N50
28S50
28SF50
WILTRON:
26N75
26B75
Table 4. Recommended Test Equipment
6 SWR OMM
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