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Archive for the ‘Cables’ Category

About Cable Constructions

Saturday, December 6th, 2008

Conductor

Solid of stranded silver plated copper (SPC) and silver plated copper clad steel (SPCW) and silver covered copper(SC) and silver covered copper clad steel(SCCS) wires with 40 micro inch minimum silver plating thickness for all configurations.

Dielectric

All of the high temperature, high performance coaxial cable listed have PTFE dielectrics with high dielectric strength and low capacitance in proportion to the dielectric constant. All PTFE dielectrics are manufactured with tolerances tighter than the MIL-C-17 specification to ensure uniformity of electrical characteristics, especially impedance, attenuation and VSWR.

Outer Conductor (Shield)

High temperature braids of silver copper (SPC) wire with a 40 micro inch minimum silver plating thickness are designed in accordance with the appropriate MIL-C-17 specification.

Jacket

Exttuded fluorinated ethylene propylene (FEP) is available. The FEP is excellent because of its high temperature resistance and chemical inertness.

Terminology of RF/Microwave cables

Saturday, December 6th, 2008

Attenuation

There are two types of losses with a MIL-C-17 coaxial cable. The first results from the dielectric properties of the core and the second is from conductor losses. The use of PTFE as a dielectric provides the lowest dielectric constant and is very stable over a wide range of temperature and frequencies. The conductor losses depend on the base material of the conductor and shield along with the plating of each, especially in higher frequency ranges.

V.S.W.R (Voltage Standing Wave Ratio)

The VSWR is the vector addition of the impedance changes along the length of a cable. The variations can be random or periodic. A resonance can occur at a particular frequency resulting in a VAWR spike. These impedance changes will often be related to a process during manufacturing. Because of the ram extrusion process for manufacturing PTFE dielectrics, most of the dielectric manufacturiog spikes are not present. The VSWR will change with frequency.

Characteristic Impedance

MIL-C-17 coaxial cable are available with characteristic impedance values 50, 75 and 95 ohms. Most systems use 50 ohms because it allows for maximum power transmission with minimum loss. The 75 ohms cables are more common in cable TV transmission where minimum cable attenuation. The 95 ohms cables are typically used for data transmission applications.

What makes building your next cable assemblies at Cross RF?

Thursday, October 9th, 2008

Cross RF is an industry leading producer of custom cable assemblies to the test equipment, cellular, radio frequency, microwave, industrial, aerospace and military markets.

Focusing on RF / Microwave cabling solutions, we have professionalism in terms of product Quality, Competitive Pricing and rapid OEM capacity. The following is the factors why you can rely on our cable assemblies.

ISO 9001:2000 certified

Our products rely on ISO certified, reliable and compatible sources.

Meeting MIL-C-17 standards

Our RG replacement cable assemblies meet or exceed military, M-C-17 specifications.

Competitive Pricing

Looking for the most cost effective options on custom cables? That’s simply us.

Fast Delivery

Need thousands of custom assemblies by next week? We have a capacity of processing thousands of assemblies per week. (Normal delivery time for custom cables is 3 weeks.)

RoHS Compliant

Compliance with RoHS (Restriction of Hazardous Substances) directive.

Simplicity Guaranteed

Don’t waste your time on requesting a quote. Cross RF online catalog enables you to check your price and buy online.

Buy Easy & Safe

Cross RF offers the permanent shopping cart, order update, and the SSL encryption tools to secure your personal or company data.

From RG, LMR series Flex to Semi-Flex and Semi-Rigid cables, Cross RF can meet your custom cable needs with a wide range of connector configurations including: SMA, SMB, SMC, N, BNC, TNC, MCX, MMCX, and DIN.

Visit us online ( http://www.crossrf.com ) and let us put our experience to work for your business.

Flex Cables

  • RG series cables
  • LMR cross cables
  • MIL-C-17 replacements

Semi-Flex Cables

  • Hand-conformable Flexibility
  • Copper-tin/Jacketed composite
  • Industry Standard: 047, 085, 141 and 250

Semi-Rigid Cables

  • Maximum Performance, 20Ghz
  • Copper-tin plated composite
  • Industry Standard: 047, 085, 141 and 250

LMR200 Cross Cable

Thursday, July 17th, 2008

Series 200 Low-Loss Coaxial Cable Type : LMR-200 (DW-200)

Cable Ordering Information

Part Number MI Number NEC / CSA Listing Remark
DW-200 TU-1313 none

Characteristics

Material Detail inches mm
Inner Conductor Bare Copper 0.044 1.12
Dielectric Foamed Polyethylene 0.116 2.95
1st Outer Conductor Sealed APA Tape 0.120 3.10
2nd Outer Conductor 91% Tinned Copper Braid 0.142 3.60
3rd Outer Conductor
4th Outer Conductor
Floodant
Jacket PE, Black 0.195 4.95
Twisted Pairs
Messenger
Mechanical Specifications
Minimum Bend Radius 0.5 12.7
Product Weight (less reel) 21.5 lbs/kft 32 kg/km

Customers are reminded that they are SOLELY responsible for confirming that all products are properly installed and used In accordance with all applicable codes and regulations.

uncontrolled copy

All Rights Reserved,
Specifications subject to change without notice

Electrical Specifications
Characteristic Impedance, Ω 50 ± 3
Velocity of Propagation, % 82
Capacitance, Nominal 24.5 pF/ft 80.4 pF/m
DC Resistance Ω / kft Ω / km
Inner Conductor 5.36 17.59
Outer Conductor 4.9 16.08
Loop 10.26 33.67
Attenuation, Nominal @ 68 °F (20 °C)
Frequency, MHz dB / 100 ft dB / 100 m
150 4.0 13.1
220 4.8 15.9
450 7.0 22.8
900 9.9 32.6
1500 12.9 42.4
1800 14.2 46.6
2000 15.0 49.3
2500 16.9 55.4

Customers are reminded that they are SOLELY responsible for confirming that all products are properly installed and used In accordance with all applicable codes and regulations.

uncontrolled copy

All Rights Reserved,
Specifications subject to change without notice

Semi-Flex Conformable® Low Loss Coax Cable Assemblies

Wednesday, July 9th, 2008

Semi-Flex Conformable® Low Loss Coax Cable Assemblies

Cross RF provides the hand conformable flexible alternative to standard 047, 085, 141 and 250 semi rigid coax.

Utilizing a unique copper-tin composite shield and a durable, well performing Teflon dielectric, this cable is easy to bend by hand. Conformable coax cable assemblies are ideal for prototypes, aerospace, commercial or military and microwave equipment in the developing phase, but you still require the benefit of a phase stable, low loss cable that will exhibit electrical properties comparable with the final design.

You may easily manipulate multiple times the cable to accommodate design changes, and when necessary change the cable shape. It can be configured with your choice of connectors including: MCX, MMCX, SMA, SMB, SMC, TNC, and N.

Specifications

Semi-Flex Conformable

.047 (OD)

.085 (OD)

.141 (OD)

.250 (OD)

Center Conductor

SCCS

SCCS

SCCS

SC

Dimension in. (mm)

.007 (.18)

.020 (.51)

.036 (.91)

.065 (1.65)

Dielectric

TFE .033

TFE .066

TFE .116

TFE .209

Jacket

Cu/Sn Composite

Cu/Sn Composite

Cu/Sn Composite

Cu/Sn Composite

Min. Inside Bend in. rad

.125″

.125″

.250″

.375″

Impedance

50

50

50

50

Capacitance

30.0

29.5

29.3

29.6

Velocity of Propogation

70%

70%

70%

70%

Max Voltage vrms

1000

1500

1900

5000

Frequency Range

DC to 20GHz

DC to 20GHz

DC to 20GHz

DC to 18GHz

Temperature range °C

-65+150

-65+150

-65+150

-65+150

Attenuation (db/100ft)

.5GHz

25.0

15.0

8.0

4.4

1GHz

36.0

22.0

12.0

6.7

10GHz

128

83.0

45.0

27.0

15GHz

162

120

65.0

36.0

20GHz

192

126

70.0

NA

Power (W)

.5GHz

45

180

600

1900

1GHz

32.5

130

450

1400

10GHz

13

35

120

350

15GHz

11

26

88

200

20GHz

10.5

20

70

NA