Rigid line inner support 3 1/8" EIA / SMS


SPINNER Rigid Coaxial Lines components - robust performance

A rigid coaxial transmission line is mainly used in broadcast systems to transmit radio frequency signals between transmitter and combiners as well as between combiners and the antenna. The advantage of rigid coaxial lines is that the radiation leakage and attenuation, especially at higher frequencies, is lower than with flexible coaxial cables. This means that greater power can be transmitted, and higher shielding attenuation can be achieved.

Outstanding RF characteristics, best possible passive intermodulation and VSWR

The Rigid line inner support 3 1/8" EIA / SMS enables you to transmit high-frequency signals reliably and flawlessly with optimum protection of your sensitive equipment in a power range up to 67 kW @ 100 MHz (at +40 °C ambient temperature), 44 kW @ 230 MHz (at +40 °C ambient temperature), 23 kW @ 860 MHz (at +40 °C ambient temperature) with maximum passive intermodulation (IM3).

The positive characteristics are briefly summarised: very stable rigid line system, low insertion loss, low VSWR, PTFE insulation, designed for pressure-tight systems, for outdoor application.

Coaxial flange connectors, generally known as “EIA flanges”, are connected by a coupling element. The flange connector system complies with international standards EIA STD RS-225, 339 IEC, DIN EN 122150 and MIL-F 24044. The EIA flange connectors are excellently qualified suited for pressurized systems and for outdoor installations. 3 1/8" EIA connectors are used to link two elements of a rigid or semi-rigid high performance coaxial transmission line for radio frequency signals. Typically, these are operated in systems for very high power transmission (from kW to MW), e.g. in DAB, DVB or FM broadcast systems or in high-energy applications in research facilities (particle accelerator, plasmatron).

An inner support component connects two inner conductor tube components and fixates them in the center of a straight waveguide section.

RF characteristics

Number of interfaces:
Interface type:
3 1/8" EIA (50 Ω) per IEC 60339-2
3 1/8" SMS (50 Ω)
Interface direction:
Waveguide component type:
Inner support
Frequency range:
DC to 1.3 GHz
Cut-off frequency:
1.6 GHz (H11 mode)
Average power rating:
67 kW @ 100 MHz (at +40 °C ambient temperature)
44 kW @ 230 MHz (at +40 °C ambient temperature)
23 kW @ 860 MHz (at +40 °C ambient temperature)
Proof voltage rating:
14 kV
Proof voltage rating remark:
(at sea level (NN))
Insertion loss coefficient /100m:
0.32 dB @ 100 MHz (at +20 °C ambient temperature)
0.48 dB @ 230 MHz (at +20 °C ambient temperature)
0.92 dB @ 860 MHz (at +20 °C ambient temperature)

Mechanical characteristics

Weight, approx.:
270.0 g

Further remarks

• very stable rigid line system
• low insertion loss
• low VSWR
• PTFE insulation
• designed for pressure-tight systems
• for outdoor application
Customs tariff number:



Product data sheet – 870003 – CB-L-180-181-DS.pdf