True 75 Ohm BNC Straight Cabled Plug -
3 Piece Solder or Crimp Captivated Contact
INCHES (MILLIMETERS)
CUSTOMER DRAWINGS AVAILABLE UPON REQUEST
PART NUMBER
CPMC-68-34
CABLE TYPE
Belden 1855A, 720A
Commscope 7538,
Gepco 7538
CONTACT I.D.
BODY I.D.
FERRULE I.D.
.028 (0.71)
.105 (3.81)
.180 (4.57)
1. Identify connector parts.
(3 piece parts)
2. Slide crimp sleeve over the cable as shown.
3. Strip cable per dimensions given and
loosen braid.
4. Place contact over cable center conductor
and position against insulation.
5. Crimp (.042 crimp hex) or solder contact.
If crimping the contact, crimp the contact
as close as possible to the cable insulation
as shown.
6. Push the cable with the attached contact
into the connector body until contact is cap-
tured by internal rib within connector body.
Contact location shall be per dimension
shown. Slide crimp sleeve over braid until
it rests against top of connector body. Fin-
ish assembly by crimping with appropriate
crimp hex die as indicated for each con-
nector by the table.
Part
Number
CPMC-68-34
Cable Type
Belden 1855A, Commscope 7538, Gepco 7538
Crimp
Sleeve Hex
.178 (4.52)
Contact
Crimp Hex
.042 (1.07)
Recommended
Crimp Tool
24-9963P
Cambridge Products, P.O. Box 1732, Waseca, MN 56093-0832 • 1-800-243-8814 • Fax: 507-833-6287 • www.cambridgeproducts.com
BNC Connectors - True 75 Ohm
Specifications
Electrical Characteristics
Impedance:
75 Ohm
Frequency range:
0-3 GHz
VSWR:
BNC Cabled Plugs (except CPMC-68-18) ....... 1.10 + .03 F (F in GHz)
CPMC-68-18 .................................................... 1.22 + .01 F (F in GHz)
BNC Adapters (In-series and Between-series) 1.03 + .02 F (F in GHz)
Working voltage:
BNC Cabled Plugs and Adapters
(except CPMC-88-18, 20 and 33) ............ 500 VRMS at sea level
CPMC-88-18, 20 and 33 ......................... 335 VRMS at sea level
Dielectric withstanding voltage:
BNC Cabled Plugs and Adapters
(except CPMC-88-18, 20 and 33) .......... 1500 VRMS at sea level
CPMC-88-18, 20 and 33 ........................ 1000 VRMS at sea level
Insulation resistance:
5000 megohms minimum
Contact resistance:
Outer - Nickel plated initial 1.0 milliohm max,
after environmental 1.5 milliohm max
Center - Initial 3 milliohm max,
after environmental 4 milliohm max
Braid to Body - 2.5 milliohm max (nickel plated), after environ-
mental not applicable
Corona level:
375 volts minimum at 70,000 feet
RF High Potential Withstanding Voltage:
700 VRMS at 4 MHz
Environmental Characteristics
(meets or exceeds the applicable paragraph of MIL-C-39012)
Thermal shock:
MIL-STD-202, Method 107
INCHES (MILLIMETERS)
CUSTOMER DRAWINGS AVAILABLE UPON REQUEST
Operating temperature:
-65
O
C to 165
O
C
Corrosion:
MIL-STD-202, Method 101, Condition B
Shock:
MIL-STD-202, Method 213, Condition B
Vibration:
MIL-STD-202, Method 204, Condition B
Moisture resistance:
MIL-STD-202, Method 106
Mechanical Characteristics
Durability:
500 cycles min
Force to engage/disengage:
5 lbs. max, after durability 5 lbs max; 1
lb. min.
Coupling nut retention:
75 lbs. min
Contact retention:
6 lbs. min axial force
Material Specifications
Body:
Brass, nickel plated .0001 min over copper plated .00005 min
Contact:
Brass, gold plated .00005 min over nickel plated .00005
min over copper plated .00005 min
Crimp Sleeve:
Copper, nickel plate .0001 min over copper plated
.00005 min
Nut:
Zinc, nickel plated over copper plated
Insulator:
Teflon
Spring Washer:
Beryllium Copper (unplated)
Flat Washer:
Steel, nickel plated
Gasket:
Silicone rubber
True 75 Ohm BNC Plug and Jack Mating Engagement
Cambridge Products, P.O. Box 1732, Waseca, MN 56093-0832 • 1-800-243-8814 • Fax: 507-833-6287 • www.cambridgeproducts.com
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