depth, if the SWR Autotester or bridge connector
measures out of tolerance (Table 3) in the “+”
region of the gauge (Figure 3), the center pin is
too long. Mating under this condition will likely
damage the SWR Autotester or bridge connector.
On the other hand, if the test device connector
measures out of tolerance in the “–” region, the
center pin is too short. While this will not cause
any damage, it will result in a poor connection
and a consequent degradation in performance.
b. Avoid Over Torquing Connectors. Over
torquing connectors is destructive; it may dam-
age the connector center pin. Finger-tight is usu-
ally sufficient, especially on Type N connectors.
Should it be necessary to use a wrench to tighten
SMA or WSMA connectors, use a torque wrench
that breaks at 5 inch-pounds. As a general rule,
never use pliers to tighten connectors.
c. Do Not Disturb Teflon Tuning Washers On
Connector Center Pins. The center conduc-
tor on many SWR Autotester or bridge connec-
tors contains a small teflon tuning washer lo-
cated near the point of mating (interface) (Figure
4). This washer compensates for minor imped-
ance discontinuities at the interface. The
washer’s location is critical to the SWR
Autotester or bridge’s performance. Do not dis-
turb it.
Series
Port/
Conn. Type
Pin Depth
(MILS)
Gauge
Reading
58, 59,
87,
97
1
INPUT – NF 207 +0.000
–0.010
Same As
Pin Depth
OUTPUT – NF 207 +0.000
–0.010
58, 59,
87, 97
TEST – A +0.000
–0.003
97 TEST – N 207 –0.000
+0.003
207 +0.000
–0.003
TEST – NF 207 +0.000
–0.003
Same As
Pin Depth
TEST – S
2
–0.0025
–0.0035
TEST – SF
2
–0.0003
–0.0007
60, 63 INPUT – NF 207 +0.000
–0.020
N/A
60 OUTPUT – NF
60, 63 TEST – A +0.000
–0.003
Same As
Pin Depth
TEST – N 207 +0.000
+0.003
207 +0.000
–0.003
TEST – NF 207 +0.000
–0.003
Same As
Pin Depth
62 INPUT – NF 207 +0.000
–0.020
OUTPUT – NF
62 TEST – N 207 –0.000
+0.018
207 +0.000
–0.018
TEST – NF 207 +0.000
–0.018
Same As
Pin Depth
Legends and Notes
Typical Model Number:
97SF50
Connector Type Abbreviations:
N = Type N male
NF = Type N female
A = GPC-7
Impedance
Connector Type (Test Port
Connector on Bridges and
SWR Autotesters
Impedance
Table 3. Pin-Depth Tolerance, SWR
Autotesters and Bridges
TEFLON WASHER
NOTE
The teflon washer is shown on a GPC-7 connec-
tor. A similar washer may be installed on any
WILTRON precision connectors.
Figure 4. Tuning Washer on GPC-7 Connector
SWR OMM 5
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