25 kW dual SmartLoad DC-860 MHz 230 V 3 1/8" EIA product photo Front View L
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25 kW dual SmartLoad DC-860 MHz 230 V 3 1/8" EIA

Not available This product is discontinued.

SPINNER loads offer outstanding electrical and mechanical properties

The modular SPINNER system for loads offers you great flexibility in the selection of your components. It allows you to configure power, frequency range and connectors according to your individual requirements. The advantages are obvious: cost savings through standardization and reliable technical quality.

The 25 kW dual SmartLoad DC-860 MHz 230 V 3 1/8" EIA is placed to the end of the signal path and thus guarantees the correct impedance termination. This reduces disturbing reflections and ensures the maximum performance and quality of the overall system. You can individually combine your attenuator and adapt it to the requirements of your local installation.

The 25 kW dual SmartLoad DC-860 MHz 230 V 3 1/8" EIA ensures optimum protection for your highly sensitive signal transmission between transmitter and antenna on broadcast sites.

Outstanding RF characteristics, best possible passive intermodulation and VSWR

The load enables you to transmit high-frequency signals reliably and flawlessly with optimum protection of your sensitive equipment in a power range up to 25 kW.

The load offers an interface 3 1/8" EIA.

SPINNER loads can be mounted vertically or horizontally. Only in a few cases a certain orientation is required for a product and therefore explicitly stated in our product data sheets.

We use liquid cooling for higher power levels. A mixture is used as the coolant which guarantees frost and corrosion protection. From 10 kW we also offer recooling units and safety devices such as Carrier safety loops or temperature monitoring.

The protection class is IP 20.

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).

RF characteristics

Number of interfaces:
Interface type:
3 1/8" EIA (50 Ω) per IEC 60339-2
Interface type remark:
facing upwards; 4 1/2" EIA for P ≥ 23 kW and f ≥ 700 MHz necessary – order adapter BN 715010
Interface direction:
Frequency range:
DC to 860 MHz
Average power rating:
25 kW (power input 1 + input 2)
Proof voltage rating:
17 kV
VSWR, max.:
1.04 @ DC to 108 MHz
1.04 @ 108 to 470 MHz
1.04 @ 470 to 860 MHz
1.08 @ DC to 860 MHz

Electrical characteristics

Mains connection:
male power socket, according to IEC 60320-1 (C20)
Mains voltage:
230 V
Mains voltage tolerance:
± 10 %
Mains AC frequency:
50 to 60 Hz
Mains connection system:
L, N, PE
Mains nominal current, approx.:
12 A
Power consumption, approx.:
25 W (standby), 1.5 kW (full operation)
Operating modes:
Standby and RF power approx. 80 W: natural cooling without pump or fan 1)
RF power approx. 80 W to approx. 800 W: pump only 1)
RF power approx. 800 W to 25 kW: pump and fan 1)
Interlock connection:
two-pole connector with screw locking according to IEC 60130-9, Co. Binder, series 581/680/682, TYP 09-0303-00-02, or at termination block inside control box
Interlock voltage:
≥ 42.4 V ACpk
≥ 60 V DC
Interlock voltage remark:
SELV circuits according to IEC EN 60950-1
Interlock current, max.:
1 A

Mechanical characteristics

Operating modes:
Standby and RF power approx. 80 W: natural cooling without pump or fan 1)
RF power approx. 80 W to approx. 800 W: pump only 1)
RF power approx. 800 W to 25 kW: pump and fan 1)
Cooling type:
Heat exchanger type:
25 kW special SPINNER single ventilator type
Coolant density:
1.054 kg/dm³ (at +20 °C)
Chemical composition:
mixture of distilled water, 39 Vol. % ethylene glycol and corrosion inhibitor,
Degree of protection:
IP 20
Weight, approx.:
150.0 kg

Environmental conditions

Operational environment:
operating sites with limited access
Operating temperature:
-10 to +45 °C
Relative humidity, max.:
95% (condensation not allowed)
Operating altitude, max.:
2286 m
Storage ambient temperature:
-25 to +70 °C
Storage relative humidity, max.:
95% (condensation not allowed)

Scope of delivery & accessories

Delivery scope:
mains cable connector, interlock cable connector, product manual, material safety data sheet of the coolant

Further remarks

Two independent liquid cooled loads share a common cooling system.

Coaxial load with intelligent control:
• standby function
• pump and fan activated only when needed
• super fast self protection
• inputs can be powered in parallel with maximum 25 kW in total
• individual interlock loops for every input
• single phase power supply
• rear and side walls can be covered
• outdoor heat exchanger available optionally
Depending on the ambient temperature and the RF power applied, the pump and/or fan can switch on at any time and switch off again according to the required cooling capacity.
Customs tariff number:



Product data sheet – 546434C0200 – 546434C0200-DS.pdf


Safety data sheet – 546434C0200 – SPINNER_AntifrogenN.pdf


Safety data sheet – 546434C0200 – outdated – SPINNER_AntifrogenN_(2017).pdf


Software – 546434C0200 – Software-Download-SmartLoad_D13351_Rev.H.zip


Product manual – 546434C0200 – M36485.pdf