R&S®UBL100 Ultra Broadband Load

From DC to 18 GHz

Key facts

  • Very good return loss, especially up to 6 GHz
  • High power capability
  • Very rugged for short-term overload

Brief description

The R&S®UBL100 is an ultra broadband load that can be used from DC to 18 GHz.

Specifications

RF specifications
Frequency range DC to 18 GHz
Input impedance 50 Ω

Key facts

  • Very good return loss, especially up to 6 GHz
  • High power capability
  • Very rugged for short-term overload
  • High crest factor capability
  • Easy handling with optional caster wheels

Brief description

The R&S®UBL100 is an ultra broadband load that can be used from DC to 18 GHz.

The dummy load absorbs RF power and converts it into heat, which is dissipated into the surrounding area through convection cooling. An optional fan unit improves heat dissipation. A built-in interlock loop can be used to switch off the device feeding of the load when the heatsink temperature rises above +70 °C. Unlike cable loads, there is no lower frequency limit. Depending on the input frequency and heatsink temperature, the R&S®UBL100 can absorb up to 1800 W.

Specifications

RF specifications
Frequency range   DC to 18 GHz
Input impedance   50 Ω
Input connector   4.3-10 female, adapter to N included
Input VSWR (including N adapter f ≤ 2 GHz ≤ 1.15
  2 GHz < f ≤ 6 GHz ≤ 1.25
  6 GHz < f ≤ 18 GHz typ. ≤ 1.50,
max. 2.25 possible at a few discrete frequencies
Average input power Pavg1) f ≤ 80 MHz derating, see diagrams
  80 MHz < f ≤ 1.0 GHz up to 1800 W with fan unit, see diagrams
  f > 1.0 GHz derating, see charts
Crest factor for OFDM bandwith > 1 MHz ≤ 12 dB
Peak power (duty cycle < 1 %) f ≤ 650 MHz, < 100 μs pulse width ≤ 15 kW
  f > 650 MHz, < 1 ms pulse width ≤ 15 kW
Maximum heatsink temperature surface, near the interlock connector ≤ +70 °C
Typical heatsink temperature Ths at +20 °C ambient temperature and 1000 W average power ❙ +70 °C for convection cooling, see user manual
❙ +33 °C with optional fan unit, see user manual
Temperature protection   thermoswitch for external interlock loop, normally closed, opens at > +70 °C
Interlock loop connector (thermoswitch)   D-Sub, 9-pin female, pin 1 and pin 5
Thermoswitch rating voltage to ground, pin to pin ≤ 50 V
  current ≤ 1 A
Cooling   convection cooling,
optional fan unit
General data
Dimensions (W x H x D) including handles and feet 492 mm × 480 mm × 198 mm
(19.4 in × 18.9 in × 7.8 in)
Weight   45 kg (99.2 lb)
Fan unit
Operating voltage range   85 V to 264 V AC, 47 Hz to 63 Hz
Rated current   ≤ 0.9 A
Noise emission in typical lab environment approx. 77.5 dB(A)
Environmental conditions
Temperature ranges    
Minimum operating temperature (ambient) ultra broadband load and fan unit +5 °C
Maximum operating temperature (ambient) ultra broadband load see derating curve for average power versus ambient temperature on page 2
  fan unit +45 °C
Maximum operating temperature (air inlet) fan unit +60 °C
Storage temperature range ultra broadband load and fan unit –40 °C to +80 °C
Damp heat ultra broadband load ≤ 95 % noncondensing
  fan unit ≤ 90 % noncondensing
Operation above sea level ultra broadband load and fan unit 2000 m
Transportation above sea level ultra broadband load and fan unit 4600 m

1) Depending on input power and exposure time; +70 °C surface temperature must not be exceeded.

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