Dual Duplex Filter 850

Designed as an 850MHz transmit cleanup filter, the Kaelus DDF0035 is used to attenuate spurious from a wideband CDMA base station and reduce its effects on a nearby 900MHz frequency allocation.


  • For use with WCDMA850 node-B with co-located GSM900 systems
  • For indoor or outdoor use
  • Covers FA01, FA02 and FA03 channels, 86 dB rejection, ceramic technology
  • Provides rejection of microwave link frequencies near 850 uplink band
  • Internal DC/AISG bypass path

technical specifications
downlink (bts tx)
Passband 875 - 889.6MHz
Insertion loss 1.3dB maximum, 0.8dB typical band edge
0.5dB typical at mid-band
Return loss 18dB minimum
EVM (Across 3.84MHz)
8% maximum / 6% typical (CH FA01),
8% maximum / 6% typical (CH FA02),
8% maximum / 2.6% typical (CH FA03),
Group delay variation (Across 3.84MHz)
250ns maximum / 150ns typical (CH FA01, CF 887.2MHz),
100ns maximum / 70ns typical (CH FA02, CF 882.2MHz),
100ns maximum / 30ns typical (CH FA03, CF 877.4 MHz)
Across passband= 700ns maximum / 820ns typical
Absolute group delay 800ns maximum / 670ns typical
Maximum input power 2 x 160W WCDMA carriers (32DCPH)
uplink (bts rx)
Passband 830 - 844.6MHz
Insertion loss 1.0dB maximum, 0.85dB typical at band edge
0.5dB typical at mid-band
Return loss 18dB
Group delay variation (Across 3.84 MHz)
50ns maximum / 20ns typical (CH FA03 and FA02),
100ns maximum / 70ns typical (CH FA01)
Across passband= 200ns maximum / 100ns typical
Absolute group delay 500ns maximum / 200ns typical
891.6 - 898.3MHz 86dB minimum
847 - 852MHz 20dB minimum
Impedance 50ohms
Intermodulation products <-150dBc with 2 x 43dBm carriers, reflected mode
dc / aisg
Passband DC - 3MHz
Insertion loss 1dB maximum
Return loss 12dB minimum
Input voltage range +/- 33V maximum, 2 Amp
For further details of environmental compliance, please contact Kaelus.
Temperature range -20ºC to +60ºC | 4ºF to +140ºF
Altitude 2000m | 6,560ft maximum
Lightning protection Gas arrestor fitted to DC bypass path. M6 earth stud fitted to connector face.
Dimensions H x D x W 400 x 380 x 78mm | 15.75 x 14.96 x 3.07in
Weight 17kg | 34.48lbs
Finish Powder coated, light grey (RAL7035)
Connectors DIN 7-16 (F) x 2
Mounting Pole/wall bracket supplied with two metal clamps for 45-178 mm diameter poles
ordering information
Part Number Description
DDF0035F1V1 Dual Duplex Filter, 830-844.6/875-889.6, rejection 86dB@891.6MHz, outdoor
DDF0035F1V2 Dual Duplex Filter, 830-844.6/875-889.6, rejection 86dB@891.6MHz, outdoor
mechanical block diagram