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8PPXX271E Series
Band IV/V (UHF) PeakPower+TM 30kW bandpass filter

The RFS 8PPXX271E is designed for global filtering applications associated with DTV television transmission. It is an 8-pole liquid cooled filter incorporating dual cross couplings. The 8-pole filter allows for FCC tightening of emission mask for ATSC 3.0 in the future.

FEATURES / BENEFITS

  • Meet FCC mask requirements plus extra protection for adjacent channels.
  • Very compact for easy integration into equipment.
  • Lowest insertion loss and highest power rating for its size/class.
  • Tunable over UHF band (470 – 704 MHz).
  • Adjustable bandwidth, available for 6  and 8 MHz channels for global applications.
  • External coupling adjustment simplifies tuning.
  • All data presented upon filed measured results.


8PPXX271E Filter

Technical features

General Specifications

Product LineFilters
Product TypeBand IV/V (UHF) TV Bandpass Filter
Model8PPXX271E
Filter type8 Pole with 2 cross couplings - 270 mm ground plane spacing - Liquid Cooled
Input / Output Connector3-1/8" to 6-1/8" Unflanged and Flanged Female Connectors Are Available

Electrical Specifications

ImpedanceΩ50

Mechanical Specifications

Weight kg (lb)160 (352)

Cooling

CoolingLiquid Cooled
Flow Ratel/min3 ≤ rate ≤ 12 (1 ≤ rate ≤ 4 US gal.min)
Max. Propylene Glycol / Water Concentration %50

Specifications

Out-of-Band Emissions MaskDVB-T ETSI criticalDVB-T ETSI criticalISDB-T criticalATSC 1.0/ATSC 3.0 Note1
Channel Bandwidths MHz8666
Frequency RangeMHz470-704
Input Power Rating, KWkW26.5 @ 474 MHz
28.5 @ 698 MHz		24 @ 473MHz
22 @ 701MHz		24 @ 473MHz
22 @ 701MHz		30/24 @ 473MHz
30/25 @ 701MHz
Note 2
Insertion Loss at FcdB<0.24 @ 474 MHz
<0.26 @ 698 MHz		<0.33 @ 473 MHz
<0.35 @ 701 MHz		<0.33 @ 473 MHz
<0.35 @ 701 MHz		<0.31 @ 473 MHz
<0.33 @ 701 MHz
AttenuationdB<1.2 at Fc ± 3.8 MHz
>15.0 at Fc ± 4.2 MHz
>27.0 at Fc ± 6.0 MHz
>52.0 at Fc ± 12.0 MHz		<1.6 at Fc ± 2.85 MHz
>15.0 at Fc ± 3.15 MHz
>27.0 at Fc ± 4.5 MHz
>52.0 at Fc ± 9.0 MHz		<1.3 at Fc ± 2.79 MHz
>14.0 at Fc ± 3.15 MHz
>31.0 at Fc ± 4.5 MHz
>61.0 at Fc ± 9.0 MHz		<0.7 at Fc ± 2.69 MHz <0.9 at Fc ± 2.915 MHz
>20 at Fc ± 3.5 MHz
>20 at Fc ± 4 MHz
>40 at Fc ± 6 MHz
>65 at Fc±9 MHz
Note 3
VSWR average across carriers≤1.1
Return Loss Average Across CarriersdB≥26.4
Group Delay Variationns<590 at Fc ± 3.8 MHz<690 at Fc ± 2.85 MHz<590 at Fc ± 2.79 MHz<290 at Fc ± 2.69 MHz
Maximum Operating Temperature°C (°F)80 (176)
Ambient Temperature Range°C (°F)-5 to 55 (23 to 131) Note 2
Maximum Temperature Rise°C (°F)Δ40 (Δ72)
Freq Drift - Tx OperationkHz/°C(°F)<2 (1.2)
Freq Drift - Ambient TemperaturekHz/°C(°F)<2 (1.2)


8PPXX271E Plan and Side View


8PPXX271E Iso View


Graph 1 - 8PPXX270/271E Filter Typical Response


Graph 2 - Coolant (Liquid Cooled) Temperature [°C(°F)]

Notes

  • Note 1. Other out-of-band emissions masks upon request.
  • Note 2. >25kW input power for ATSC 1.0 only. Refer to Graph 2 for required cooling conditions.
  • Note 3. Tx intermod shoulders 37dB.