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SMK - 50 Ohm Connectors
(2.92mm)
INCHES (MILLIMETERS) ? CUSTOMER DRAWINGS AVAILABLE ON REQUEST
Johnson SMK (2.92mm) Connectors
The Johnson SMK Connector provides an excellent solution
for demanding applications requiring high frequency trans-
mission. Although similar to the SMA interface, a smaller
internal body diameter (2.92mm) and air dielectric provide
a higher cutoff frequency and other key advantages:
? Precision manufacturing allows superior electrical
performance to 40 GHz.
? Female contacts have a unique three-slot construction,
which enhances connectivity by creating a more rugged connector
while reducing the chance of intermittent connections.
? Precise assembly tooling assures excellent, repeatable contact and support bead location on cabled connectors.
? Connector mating interface per MIL-STD-348
? Mating interface control provides consistent electrical performance.
? The plug connector VSWR is 1.20 Max to 40 GHz and a 12 inch SMK plug to plug cable assembly performs
better than 1.35 VSWR to 40 GHz.
? The Field Replaceable Jacks are teamed with a high quality hermetic seal feed thru for use in sealed
circuit modules.
? The SMK plug interface employs more precise dimensions than an SMA and uses a shorter snub nose male
pin such that the connector bodies align before the contacts engage.
MATERIAL SPECIFICATIONS
Bodies: Stainless steel per QQ-B-626, gold plated* per MIL-G-45204
.00005" min. or passivated per MIL-F-14072 B (EL) 300
Contacts:
Female - beryllium copper per QQ-C-530, gold plated per
MIL-G-45204 .00005" min.
Contact Support Beads: PTFE fluorocarbon per ASTM D 1710 and
MECHANICAL RATINGS
Engagement Design: MIL-STD-348, Series SMK (2.92mm)
Engagement/Disengagement Force: 2 inch-pounds maximum
Mating Torque: 7 to 10 inch-pounds
Coupling Proof Torque: 15 inch-pounds minimum
Coupling Nut Retention: 60 pounds minimum
Contact Retention: 6 lbs. minimum axial force (captivated contacts)
ASTM D 1457 or modified PPE resin
Cable Retention:
Axial Force* (lbs) Torque (in-oz)
Seal Rings: Silicone rubber per ZZ-R-765
* All gold plated parts include a .00005" min. nickel underplate barrier layer.
.086 Semi-Rigid ...................................30 16
.141 Semi-Rigid ...................................60 55
*Or cable breaking strength whichever is less.
Durability: 500 cycles minimum
Mating Engagement for SMK (2.92mm) Series
PLUG
JACK
PLUG
JACK
Notes:
1. ID of contact shall meet VSWR and connectivity requirements
when mated with dia. .0355-.0365 male pin.
Connectivity Solutions
Tel: 800-247-8256 ? Fax: 507-833-6287 ? www.EmersonNetworkPower.com/connectivity
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