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8PXX270DAB
Band III (VHF) bandpass filter

Rev : 02 | Rev date : 05 Nov 2021

The RFS 8PXX270DAB is designed for global filtering applications associated with Digital Radio transmission. It is a 8-pole natural air-cooled filter incorporating two cross-couplings to meet all mask requirements.

FEATURES / BENEFITS

  • 8 pole filters are preferred instead of 6 pole for High Power DAB transmitters because:
    The 8 pole has excellent VSWR well beyond the fc ± 0.77MHz carriers
    The ETSI EN 302 077 Case 1 requires an extra dB of mask attenuation for every dB of power over 1kW to provide an absolute level of protection to other VHF broadcasters and nearby Military frequencies. 
  • Very compact for easy integration into equipment.
  • Very low insertion loss (lowest for this size).
  • Highest power rating for size/class.
  • Tunable over full VHF band (168.16 to 239.2 MHz).
  • Tunable to ETSI EN 300 401 Critical, and ETSI EN 302 077 Cases 1 to 4 Mask Applications,   
    Europe Channels 5A to 13F, China Channels 6A to 12D,   Korea Channels 7A to 13C 
  • -5 to 55°C degree ambient temperature operation.
  • Natural air-cooled.

 


8PXX270DAB Natural Air Cooled Filter
Undergoing 8 kW Power Testing

Technical features

General Specifications

Product LineFilters
Product TypeBand III (VHF) DAB Bandpass Filter
Model8PXX270DAB
Filter type8 Pole with 2 cross couplings - 270 mm ground plane spacing
Input / Output Connector1-5/8" EIA Unflanged or Flanged Female (Standard) or
3-1/8" EIA Unflanged or Flanged Female (Optional)

Mechanical Specifications

Dimensions-WxDxHmm (in)563 x 728 x 1278.5 (22.2 x 28.7 x 50.3)
ColorBlack
Weight kg (lb)69 (152)

Cooling

CoolingNatural Air Cooled

Specifications

Out-of-Band Emissions MaskETSI EN 300 401 Critical &
ETSI EN 302 077 Case 1
ETSI EN 302 077 Case 4
Channel Bandwidths MHz1.541.54
Frequency RangeMHz168.16-239.2
Input Power Rating W63005500
Insertion Loss at FcdB<0.58<0.7
Attenuation dB<1.0 @ fc ± 0.77MHz
>18 @ fc ± 0.97MHz
>54 @ fc ± 1.75MHz
>54 @ fc ± 2.2MHz
>60 @ fc ± 3.0MHz
<1.25 @ fc ± 0.77MHz
>21 @ fc ± 0.97MHz
>54 @ fc ± 1.75MHz
>65 @ fc ± 2.2MHz
>70 @ fc ± 3.0MHz
VSWR average across carriers<1.1<1.12
Return Loss Average Across CarriersdB26.425
Group Delay Variationns<980 at fc ± 0.77 MHz<1100 at fc ± 0.77 MHz
Maximum Operating Temperature°C (°F)80 (176)
Ambient Temperature Range°C (°F)-5 to 55 (23 to 131)
Maximum Temperature Rise°C (°F)40 (104)
Freq Drift - Tx OperationkHz/°C(°F)<0.6 (0.34)
Freq Drift - Ambient TemperaturekHz/°C(°F)<0.6 (0.34)


8PXX270DAB Filter dimensions

External Document Links

Notes