2-way stretchline combiner band 4/5 DTV/ATV 23 kW NB input


SPINNER Combining Units for best radio frequency networks performance

Combining units are essential components in radio frequency networks, used to merge signals from multiple sources or split signals into multiple paths while maintaining signal integrity. All combiners work in bi-directional mode and can therefore be used to combine and split the transmitted and received signals.

The 2-way stretchline combiner band 4/5 DTV/ATV 23 kW NB input ensures optimal performance for signal transmission between transmitter and antenna in broadcast stations.

A stretchline combiner is designed to facilitate signal transmission over extended distances with minimal loss. This system combines multiple signals in a way that maintains signal integrity and strength, even across longer stretches of infrastructure. It is particularly useful in scenarios where coverage needs to span wide geographical areas or in challenging environments where traditional signal transmission might degrade.

Stretchline combiners are used as 2-way combiners when the minimum spacing is larger than three channels. Suitable mask filters can be used for converting this type of combiner from analogue to digital operation.

SPINNER’s Stretchline Combiners stand out due to their innovative design, adaptability, performance and ease of use. Our products are recommended because they provide a flexible solution for broadcast stations. Whether it’s enhancing in-building coverage or expanding network capacity, SPINNER’s Stretchline Combiners offer a reliable and future-proof option.

Outstanding RF characteristics, best possible passive intermodulation and VSWR

The 2-way stretchline combiner band 4/5 DTV/ATV 23 kW NB input enables you to transmit high-frequency signals reliably and flawlessly with optimum protection of your sensitive equipment in a power range up to 23 kW with maximum passive intermodulation (IM3).

The port path designation regarding main line and probe is as follows: Port 1, 2: narrow band input, Port 3: output

It supports the use following frequency bands : Band 4/5

The positive characteristics are briefly summarised: CCS compact design, suitable for analogue and digital TV, for 6, 7 and 8 MHz channel bandwidth.

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. 4 1/2" 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).

The product offers a transition from interface 4 1/2" EIA male to interface 4 1/2" EIA male.

RF characteristics

Number of interfaces:
Interface type:
4 1/2" EIA male (50 Ω) per IEC 60339-2
4 1/2" EIA male (50 Ω) per IEC 60339-2
6 1/8" EIA (50 Ω) per IEC 60339-2
Port / path designation:
Port 1, 2: narrow band input
Port 3: output
Interface direction:
Input : output ratio:
2 : 1
Combiner type:
Broadcast transmission type:
no mask filtering
Frequency range:
470 to 860 MHz
Frequency band:
Band 4/5
Average power rating:
23 kW
Output peak voltage rating:
22.0 kV
VSWR, max.:
Insertion loss typ.:
0.5 dB (at channel spacing ≥ 3)
0.1 dB (at channel spacing ≥ 5)
Isolation, min.:
34 dB (between inputs)

Mechanical characteristics

Cooling type:
Weight, approx.:
170.0 kg
900.0 mm
480.0 mm
1,980.0 mm

Environmental conditions

Environmental conditions:
for limitations see "Environmental Conditions for Broadcast Products" TD-00060

Further remarks

• CCS compact design
• suitable for analogue and digital TV
• for 6, 7 and 8 MHz channel bandwidth
Customs tariff number:



Product data sheet – 574636 – CB-L-51-DS.pdf