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Minutes
of the CE-4.0 RF Connectors Committee
February 22, 2001
West Palm Beach, Florida
The Minutes from
the 4-13-99 meeting were read and accepted.
Old Business
1.0 ECA Connector
Interface Review
The connector interface final drafts will be submitted in Mil-Std-348
format per ANSI Y 14.5 to the ECA by Chairman John Schimelfanick. John
requested the drafts delivered to him in two versions (.dxf ) and (.pdf
).
2.2 BNC 75 Ohm
Pin and Socket
No changes required. Amphenol will draft the finished version.
2.3 Miniature 75 Ohm SMB
No changes required. AEP will draft the finished version. (Air Dielectric,
High Density red teflon and old large body versions)
2.4 MCX, 50 Ohm
No changes required. Tyco will draft the finished version.
2.5 MMCX
No changes required. Johnson Components will draft the finished version.
New Business
1.0 Concentricity
Requirements for Center Contacts (Radial Captivation)
Problem: There are no current concentricity specifications in Mil-PRF-39012
except for a few Test connector interfaces. Discussion items included
that size of the connector ie, N Type Vs. MMCX would require variation
in concentricity values. Astro Lab made a recommendation for the N Connector
jack interface: .002" T.I.R. center contact tine to center contact
tine, .008" T.I.R. contact to body transmission bore, .004"
T.I.R. (2 places) applied from threads and from lead in taper to body
transmission bore. It was mentioned that a concentricity specification
would add measurement and documentation costs for manufacturers.
Conclusion: The
Group A and B Mil-PRF 39012 tests should predict intermateability and
identify failures caused by concentricity issues. No concentricity controls
will be added to Mil-PRF-39012.
2.0 ECA Connector Interfaces- New Proposals
2.1 TNC 75 Ohm
Ampenol recommends deleting the female contact diameter dimension. The
TNC will be proposed as air dielectric only. The extended dielectric
version limits future high frequency performance and provides no mechanical
advantage. AEP will re-draw the proposal.
2.2 N Type 75
Ohm
Astro Lab recommends pin diameter .033/.036" was .036/.037".
Several dimensional constraints are missing. Tyco will re-draw the proposal.
2.3 SMA 75 Ohm
Additional constraints will be added to standardize mechanical limits
to the 50 Ohm version. The female contact diameter may need to be specified.
2.4 Mini "SMP"
Amphenol proposes a new unnamed interface that is compatible with a
mini SMP for adoption by the ECA. Committee members will review the
proposed document and bring comments and documents of similar interfaces
for review to the next meeting.
2.5 Mil-Std-1533 Interface
Ron submitted arts and would like the committee to review this connector
interface for standardization as a Mil-Std-348 interface. DSCC will
coordinate a meeting and comments.
2.6 TK Interface
Airforce would like the 4.0 Committee to review the TK interface for
inclusion in ECA. Manufacturers will submit drawings for review by the
committee.
2.6 TNCA Vs. TNC
A user has asked that a relief in the TNCA interface body be added as
allowance for TNC insulator protrusion when inter-mating TNCA and TNC
connectors. Some manufacturers provide this and others don't. No change
will be made to the interface standard. The TNCA is a high frequency
controlled impedance alternative.
3.0 Contact Termination Strength
Ron Gary presented an issue on a TNC Hermetic connector with a tab eyelet
rear contact. A user complained that the eyelet breaks off in their
application. Ron asked if the committee should consider a strength test
requirement for the contact tab. There was much confusion by several
committee members as to application of contact retention torque. Ron
tabled this issue for inclusion in a future Military Standardization
Program. It is however, noted that Mil- C-83517 does include a contact
retention torque of 4 inch-ounce for contact to assembly retention.
4.0 Center Contact
Resistance
A DSCC supplier proposes measurement of Contact Resistance without the
cable conductor attached due to calculated negative resistance values.
The group agreed that the cable resistance contribution can not be calculated
but must be pre-measured. Proposal denied.
5.0 Connector
Temperature Ratings
A user requests standardization of all SMA connectors to 200 degree
C operation rather than the varied temperature ranges called out in
Military slash sheets. Due to the variety of applications, cables, PC
board temperature ratings and varied connector designs to match these
applications the committee agreed not to change the connector temperature
ratings.
6.0 DSCC Commercial
Statement
Ron proposes to add a cautioniary statement and a reference heading
to non DSCC part numbers (Manufacturers' commercial versions) listed
in Mil Specifications, stating "The DSCC part number must be purchased
to ensure all the required testing and performance requirements are
met". Ron will take this amended version back to DSCC for approval.
7.0 DSCC Interchangeability
Statement
A statement from Mil-DTL-38999 will be added to Mil-PRF-39012 "All
connectors having same identifying P/N shall be completely interchangeable
with each other with respect to performance".
8.0 Mil-C-17
A user of aluminum semi-rigid cable finds that the jacket deforms during
the dimensional stability test. Ron will take this back to the user
for more information.
9.0 Beryllium
Copper (BeCu) Shortage
SV Microwave suggests that lower durability requirement dash numbers
be set up in the military specifications to allow the use of non-BeCu
alternate materials.
Discussion:
Europe is limiting influx of BeCu products due to health and environmental
concerns. DSCC was told the material shortage is short term.
There has been an increase in lead content (still within ASTM limits)
starting in August which has caused plating issues. Special pre-clean
needed, lead leaches out. Apparently Brush Wellman notified everyone.
Members will bring
test results of alternate materials for review at the next meeting.
10.0 FCC Rule
15 revision was read for informational purposes about non standard antenna
connectors.
11.0 DSCC Producer
Site inspector
Joel Hemmila is asking for QPL retention guidelines and standardization.
He would also like definitions of inter slash sheet qualification within
a connector family.
12.0 The Mil-Std-1553
Interface.
Comments to be sent directly to DSCC. A coordination meetingwill be
planned.
13.0 TK Interface
A request was made by OEM'S to review the TK Interface. CDI and S/V
Microwave will submit drawings, Gore will circulate to General Dynamics
Next Meeting: June
time frame in Virginia, home of the EIA/ECA.
Submitted By:
John Schimelfanick
Chairman, EIA CE-4.0 Committee
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