50 kW SmartLoad DC-790 MHz 187-264 V 6 1/8" EIA product photo Front View L
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50 kW SmartLoad DC-790 MHz 187-264 V 6 1/8" EIA


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 50 kW SmartLoad DC-790 MHz 187-264 V 6 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 50 kW SmartLoad DC-790 MHz 187-264 V 6 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 50 kW.

The load offers an interface 6 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. 6 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:
6 1/8" EIA (50 Ω) per IEC 60339-2
Interface type remark:
facing upwards
Interface direction:
Frequency range:
DC to 790 MHz
Average power rating:
50 kW
Proof voltage rating:
17 kV
VSWR, max.:
1.04 @ DC to 108 MHz or
1.04 @ 108 to 470 MHz or
1.04 @ 470 to 790 MHz or
1.08 @ DC to 790 MHz

Electrical characteristics

Mains connection:
male power socket, according to IEC 60320-1 (C20)
Mains voltage:
187 to 264 V
Mains AC frequency:
50 to 60 Hz
Mains connection system:
L, N, PE (or L+, L-, Ground)
Mains nominal current, approx.:
15.5 A
Power consumption, approx.:
250 W (standby), 3.0 kW (full operation)
Operating modes:
RF power 0 W to approx. 500 W: cooling with pump @ idle speed, without fan 1)
RF power approx. 500 W to 50 kW: pump @ full speed with 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:
ES1 type according to IEC EN 60950-1
Interlock current, max.:
1 A

Mechanical characteristics

Operating modes:
RF power 0 W to approx. 500 W: cooling with pump @ idle speed, without fan 1)
RF power approx. 500 W to 50 kW: pump @ full speed with fan 1)
Cooling type:
Heat exchanger type:
50 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
Degree of protection remark:
per EN 60529
outdoor heat exchanger
(suitable for salt water environments)
Weight, approx.:
190.0 kg

Environmental conditions

Operational environment:
operating sites with limited access, indoor only
Operating temperature:
-10 to +45 °C
Relative humidity, max.:
95% (non-condensing)
Operating altitude, max.:
2286 m
Transport temperature range:
-20 to +70 °C
Transport relative humidity, max.:
95% (non-condensing)
Storage ambient temperature:
-20 to +70 °C
Storage relative humidity, max.:
95% (non-condensing)

Scope of delivery & accessories

Delivery scope:
power cord with IEC 60320-1 C19 socket (pigtail), interlock cable connector, product manual, material safety data sheet of the coolant

Further remarks

Coaxial load with intelligent control:
• standby function
• pump and fan controlled as needed
• super fast self protection
• potential-free interlock contact
• single phase power supply
• side walls can be covered
• height adjustable feet
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.
Cooling accessories:
filling pump set 230 V AC, 50 Hz: BN 155890C0000
filling pump set 115 V AC, 60 Hz: BN 155890C0001
Wall hanger support set: BN A76789C0001
Customs tariff number:



Product data sheet – 546437C0300 – 546437C0300-DS.pdf


Safety data sheet – 546437C0300 – SPINNER_AntifrogenN.pdf


Safety data sheet – 546437C0300 – outdated – SPINNER_AntifrogenN_(2017).pdf


Software – 546437C0300 – Software-Download-SmartLoad_D13350_Rev.I.zip


Handling instructions – 546437C0300 – 10058594.pdf


Product manual – 546437C0300 – 10085075.pdf