12G UHD/SDI Professional Digital Video Micro BNC to Neutrik Rear Twist UHD BNC on Belden 4855R 12G Cable

12G UHD/SDI Professional Digital Video Micro BNC to Neutrik Rear Twist UHD BNC on Belden 4855R 12G Cable
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Micro BNC are used by:
Embrionix SFP Modules, Blackmagic Video Assist 5” 12G HDR
and an increasing number of users who require 12G UHD SDI in a small form factor (smaller than BNC) Also Known As HD BNC (Amphenol) where HD means High Density (where a lot of connectors can fit onto a small area).
All my cables are custom made by myself using care, experience and the right tools. Precision cable stripping and cutting are essential for 3G, 6G and 12G terminations so all of my cables are stripped and cut using a CNC cable lathe made in Switzerland by Schleuniger.
Cable: Belden 4855R
This cable has been designed and built for Ultra High Definition SDI video signals, from the Belden spec sheet:
12 GHz Coax, 4K UHD Precision Video Cable, RG-59 Mini, 75 Ohm, 23 AWG solid .023″ silver plated copper conductor, gas-injected foam HDPE insulation, Duofoil® bonded to the core + tinned copper braid shield (95% coverage), PVC jacket.
Connector 1: Neutrik NBNC75BDD6X Rear Twist BNC Plug
This is the latest high performance connector from Neutrik
With Swiss antraloy plating
The rearTWIST UHD BNC connectors are specifically designed for high resolution video signal transmissions. 
Due to the unique insulator and contact pin design, the connectors feature low return loss values for 4K and 8K signals.
Complete range of 10 colour coded rubber cable strain relief caps.
Connector 2: Coax Connectors Micro BNC plug: (Coax part number: 67-005-B66-FA)
Complete with heat shrink cable strain relief.
These Micro BNC plugs make a locked connection when engaged with a bayonet twist lock movement like their full size BNC connectors. When connecting to Embrionix SFP Modules two sockets are very closely spacedthis makes the unlocking ring difficult to grip with fingers.
For ease, a pair of thin nosed pliers may be used for disconnecting (connecting is straightforward). Simply grip the knurled ring and rotate it anti-clockwise to disengage the plug, Pulling on the cable, heat-shrink strain relief or ferrule will not unlock the connection unless the knurled ring is rotated. A tool is available for very high density socket arrays where plugs can only be accessed from behind.
Technical Cable specs:
Belden 4855R Cable features & spec from web:

Technical Specifications  Product Overview

Environmental Space: Outdoor – Aerial    Suitable Applications: SMPTE 2082-1 12 Gb/s UHDTV, SMPTE 2081-1 6 Gb/s UHDTV, SMPTE 424M 3 Gb/s HD-SDI 1080P

Physical Characteristics (Overall)

Centre Conductor :

  • AWG                       18
  • Stranding                 Solid
  • Material                   SPC – Silver Plated Copper
  • Nominal Diameter   0.584 mm
  • No. of Coax             1
  • AWG Size:               23


  • Material                     Gas-injected FHDPE – Foam High Density Polyethylene
  • Nominal Diameter    2.5908 mm

Outer Shield Material

Type           Layer              Material                                           Material Trade Name           Coverage [%]

Tape             1                    Aluminum Foil-Polyester                Bonded Duofoil®                  100 %

Braid            2                     TC – Tinned Copper                                                                       95 %

Outer Jacket Material

Material                   PVC – Polyvinyl Chloride             Nominal Diameter   4.039 mm

Mechanical Characteristics (Overall)

  • Operating Temperature Range:              -30°C To +75°C
  • Bulk Cable Weight:                                25.299 Kg/Km
  • Max. Recommended Pulling Tension:     177.928 N
  • Min. Bend Radius/Minor Axis:                 40.640 mm

Applicable Specifications and Agency Compliance (Overall)   Applicable Standards & Environmental Programs

  • NEC/(UL) Specification:                          CMR
  • CEC/C(UL) Specification:                        CMG
  • EU Directive 2011/65/EU (ROHS II):        Yes
  • EU CE Mark:                                             Yes
  • EU Directive 2000/53/EC (ELV):               Yes
  • EU Directive 2002/95/EC (RoHS):            Yes
  • EU RoHS Compliance Date :                   11/08/2016
  • EU Directive 2002/96/EC (WEEE):           Yes
  • EU Directive 2003/11/EC (BFR):               Yes
  • CA Prop 65 (CJ for Wire & Cable):            Yes
  • MII Order #39 (China RoHS):                    Yes

RG Type:                                                   Sub-miniature 59/U

Flame Test

  • UL Flame Test:       UL1666 Vertical Shaft
  • CSA Flame Test:     FT4


  • Suitability – Indoor:    Yes
  • Suitability – Outdoor: Yes – Black only.
  • Suitability – Aerial:     Yes – Black only, when supported by messenger wire. Suitability – Burial:     No

Plenum/Non-Plenum Plenum (Y/N):           No

Electrical Characteristics (Overall)

Nom. Characteristic Impedance:

  • Impedance                      (Ohm) 75 Nom.


  • Inductance                     (µH/m)0.351067

Nom. Capacitance Conductor to Shield:

  • Capacitance                   (pF/m) 53.4803

Nominal Velocity of Propagation:

  • VP                                   (%) 82

Nominal Delay:

  • Delay                               (ns/m) 4.068

Nom. Conductor DC Resistance:

  • DCR @ 20°C                   (Ohm/km) 64.636

Nominal Outer Shield DC Resistance:

  • DCR @ 20°C                    (Ohm/km) 12.796

Nom. Attenuation:

Frequency (MHz)              Attenuation (dB/100m)

    • 1.000                                    1.280
    • 3.580                                    2.559
    • 5.000                                    3.019
    • 6.000                                    3.281
    • 7.000                                    3.543
    • 10.000                                  3.937
    • 12.000                                  4.265
    • 25.000                                  5.906
    • 55.000                                  8.531
    • 67.500                                  9.285
    • 71.500                                  9.613
    • 88.500                                10.565
    • 100.000                              11.123
    • 135.000                              12.599
    • 143.000                              13.124
    • 180.000                              14.469
    • 270.000                              17.849
    • 360.000                              20.802
    • 540.000                              25.756
    • 720.000                              29.824
    • 750.000                              30.448
    • 1000.000                            35.435
    • 1500.000                            43.309
    • 2000.000                            50.199
    • 2250.000                            53.480
    • 3000.000                            62.339
    • 4500.000                            77.432
    • 6000.000                            90.884
    • 12000.000                        135.177

Max. Operating Voltage – UL:

  • Voltage:              300 V RMS
Other Electrical Characteristic 1:
Return Loss: Fixed bridge and termination.
Minimum Return Loss:
Start Freq. (MHz)             Stop Freq. (MHz)              Min. RL (dB)
                5.000                          1600.000                    23.000
          1600.000                          4500.000                    21.000
          4500.000                        12000.000                    15.000
Sweep Test
  • Sweep Testing: Sweep tested 5 MHz to 12 GHz.
Notes (Overall)
Notes: Print legend includes sequential footage marks.
Neutrik NBNC75BDD6X BNC Plug Technical spec from the web
Contact resistance ≤ 3 mΩ (inner)
Contact resistance ≤ 2 mΩ (outer)
Dielectric strength 1.5 kVdc
Impedance 75 Ω
Insulation resistance > 5 GΩ
Rated voltage < 50 V
VSWR ≤1.06 / >30 dB up to 6 GHz
≤1.13 / >24 dB up to 12 GHz
≤1.22 / >20 dB up to 18 Ghz
Cable O.D. 4.3 mm
Cable retention > 30 N (center)
Crimp size 4.53 Hex crimp (shield)
Crimp size (pin) 1.07 crimp
Insertion force < 25 N
Lifetime > 1000 mating cycles
Locking device Bayonett
Cable anchoring Jacket crimping
Contacts Brass (CuZn35Pb2), 0.2 µm AuCo (center contact)
Shell Brass (CuZn39Pb3)
Shell plating Antraloy
Insert PP
Temperature range – 30 °C to +85 °C
Contact crimpability Complies with IEC 60803 and IEC 60352-2
Coax Connectors Micro BNC features & spec from web:

Micro BNC 75 ohm straight crimp plug. This true 75 ohm plug is designed for Full HD 1080p applications and general use up to 12GHz. With 15Uin gold plated centre contact and annealed crimp zones these connectors offer a long term durable solution. Suitable for all cables in group FA. When COAX Connectors developed their range of Micro BNC connectors, they were specifically designed to be interchangeable with HD BNCs from Amphenol. If equipment is built using HD BNCs, it is entirely safe to connect with Micro BNCs and vice versa.
United States Patent No. 9,071.013 applies.

Our Micro BNC 75 ohm connectors are designed for HD & UHD Broadcast, Telecom, HDcctv, Instrumentation and similar applications that require high performance in an high density package.  The unique patented coupling nut allows the use of a special tool to disconnect the connectors when they are closely mounted. Tested to beyond 12GHz and exceeding the requirements of SMPTE ST 2082-1, these connectors are used in Full HD1080p (3G), HD-SDI and are fit for Ultra HD 4K (12G) applications.  With a diameter of only 7.8 mm, mounting density is increased by 4 times when compared with a standard BNC.


Electrical Specification
Impedance 75 Ohm
Frequency Range Up to 12GHz
Dielectric Withstand Voltage 1000 Veff
Insulation Resistance 10000 M-Ohm
Return Loss -26 dB @ 6GHz
Mechanical Specification
RoHS Compliant Yes
Centre Contact Termination Crimp
Outer Contact Termination Crimp
Mating Cycles 500
Contact Retention 10N min
Cable Retention 100N min
Weight 5.64g
Mating Force 10N Max
Un-Coupling Force 10N Max
Environmental Specification
Operating Temperature -55 to +155 Deg C
IP Rating ( Mated ) IP64
Centre Contact Beryllium Copper
Outer Contact Brass
Insulator PTFE
Bayonet Cap Brass
Gasket Silicone
Centre Contact Plating Gold
Outer Contact Plating Nickel