Shively Labs FM Antennas and Accessories
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Archived articles

3-1/8" Non-Flanged Coax Components

NOTES
  • All 3-1/8" components meet EIA standards for inner and outer conductor dimensions for 50-Ω components.
  • All insulators are made from virgin PTFE.
  • See technical bulletin "tb-linespecs" for complete transmission line specifications.
  • See technical bulletin "tb-coax_cutback" for inner to outer cutback dimensions.

Performance:

Dimensions:
Impedance: 50 ohms Outer Conductor Outside diameter: 3.125" (7.9 cm)
Maximum Frequency: 1700 MHz Inside diameter: 3.027" (7.7 cm)
Velocity Percent: 99.8% Inner Conductor Outside diameter: 1.315" (3.3 cm)
Peak Power Rating: 450 kW Inside diameter: 1.231" (3.1 cm)
Average Power Rating: See technical bulletin.
Attenuation: See technical bulletin.

Transmission line
Non-flanged both ends

Each transmission line section comes without hardware or connectors. Insulators are placed approximately 48 " apart to prevent the inner conductor from sagging.

20 ft (240" or 6.10 m) long
318NF-102

  • Standard cutback
  • Approximate weight: 50 lb (22.7 kg)
  • Approximate shipping weight: 80 lb (36.4 kg)

Click picture for dimensions.

10 ft (120" or 3.05 m) long
318NF-101

  • Standard cutback
  • Approximate weight: 25 lb (11.4 kg)
  • Approximate shipping weight: 40 lb (18.2 kg)

Cut length xx.xxx inches
318NF-103-xx.xxx

  • Standard cutback
  • Approximate weight: 2.5 lb/ft (3.7 kg/m)
  • Approximate shipping weight: 4.75 lb/ft (7.1 kg/m)

Elbows

Each elbow comes with three insulators to support the inner conductor.

90° standard unequal legs
318NF-301

  • Standard cutback
  • Approximate weight: 3.5 lb (1.59 kg)
  • Approximate shipping weight: 4.5 lb (2.04 kg)

Click picture for dimensions.

90° equal legs
318NF-302

  • Standard cutback
  • Approximate weight: 2.5 lb (1.13 kg)
  • Approximate shipping weight: 3.5 lb (1.58 kg)

Click picture for dimensions.

Non-flanged adapter/reducers

Use with non-flanged line only. Each comes with insulator and inner conductors. Connectors are silver-plated. Non-pressurizable; indoor use only.

3-1/8" to Type "N" female
318NF-610

  • Standard cutback.
  • One clamp only.
  • Connector silver-plated.
  • Indoor use only - not pressurized.
  • Approximate weight: 1.5 lb (0.7 kg)
  • Approximate shipping weight: 2 lb (0.9 kg)

Click picture for dimensions.

3-1/8" to 7/8"
318NF-620

  • Indoor use only - not pressurized.

Picture not yet available.

3-1/8" to 1/5/8"
318NF-631

  • Indoor use only - not pressurized
  • Standard cutback
  • Approximate weight: 9 lb (4.1 kg)
  • Approximate shipping weight: 9-1/2 lb (4.3 kg)

Click picture for dimensions.

Non-Flanged line connectors

Use with 3-1/8" EIA non-flanged line. Connectors are silver-plated. Non-pressurizable; indoor use only.

Inner conductor connector
318NF-530

  • Inner conductor only.
  • Connector silver-plated.
  • Not supported.
  • Approximate weight: 0.25 lb (0.1 kg)
  • Approximate shipping weight: 0.75 lb (0.34 kg)

Click picture for dimensions.

Slip coupling
318NF-520

  • "Slip coupling" outer conductor only.
  • Indoor use only - not pressurized.
  • Approximate weight: 0.5 lb (0.23 kg)
  • Approximate shipping weight: 1 lb (0.45 kg)

Click picture for dimensions.

Connector assembly
318NF-570

  • Inner and outer conductors.
  • Industry standard.
  • Connector silver-plated.
  • Indoor use only - not pressurized.
  • Approximate weight: 2 lb (0.91 kg)
  • Approximate shipping weight: 2.5 lb (1.13 kg)

Click picture for dimensions.

Conversion "field" flanges and anchor connector

To convert from flanged line to non-flanged line. Each flange comes with one flange hardware kit and one O-ring.

Clamp-type
318F-901

  • Indoor use only - not pressurized.
  • Approximate weight: 3 lb (1.4 kg)
  • Approximate shipping weight: 3.5 lb (1.6 kg)

Click picture for dimensions.

Fixed flange
318F-902

  • Soft-solder type
  • Can be pressurized
  • Approximate weight: 2 lb (0.91 kg)
  • Approximate shipping weight: 2.5 lb (1.13 kg)

Click picture for dimensions.

Swivel flange
318F-903

  • Standard cutback
  • Soft-solder type
  • Can be pressurized
  • Approximate weight: 2 lb (0.91 kg)
  • Approximate shipping weight: 2.5 lb (1.13 kg)

Click picture for dimensions.

Anchor connector
318F-501

  • Inner conductor only.
  • Connectors are silver-plated.
  • Approximate weight: 1 lb (0.45 kg)
  • Approximate shipping weight: 1.5 lb (0.7 kg)

Click picture for dimensions.

Cutoff guides

Use with 3-1/8" EIA non-flanged line.

For inner conductor
318F-065

  • Approx. weight: 2 lb (0.9 kg)
  • Approx. shipping weight: 2.5 lb (1.1 kg)

Click picture for dimensions.

For outer conductor
318F-06O

  • Approx. weight: 2.5 lb (1.1 kg)
  • Approx. shipping weight: 3 lb (1.4 kg)

Click picture for dimensions.

Spare parts

Hose clamp
318F-020

  • Fits 3-1/8" transmission line.
  • Included with components.

Patch panels

Note that interlock micro switches, P/N 82INT, are sold separately. See below.

3-Port, 1 U-bend
318NF-PP3

Click picture for dimensions.

4-Port, 2 U-bends
318NF-PP4

Click picture for dimensions.

5-Port, 2 U-bends
318NF-PP5

Click picture for dimensions.

7-Port, 3 U-bends
318NF-PP7

Click picture for dimensions.

Patch panel interlock micro-switch
82INT

  • Double-pole double-throw.
Last updated: 08/22/11
Webmaster: Al Friend
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