• Combiner 3 Channels 

• Double Balanced Bridge 

• FM Band: 87.5108 MHz 

• Band II 

The Double Balanced Bridge System consists of two Band-Pass Filters, two -3dB Couplers and an Absorber. One of the inputs has a narrow-band characteristic (complying with the band-pass functions of the band-pass filters), while the other input has a broadband characteristic within the operating frequency range of -3dB couplers. Both inputs exhibit a frequency independent load impedance to the RF source.

TYPICAL SPECIFICATIONS
Model	FTDPDC05AA01 – Double Bridge Type
Impedance	50 Ohm
Frequency Range	87.5-108 MHz
VSWR ±150 KHz	1.1:1 max
Insertion Loss	at 0 f 0.35-0.55 dB Max Narrow Band Input 0.1 dB Max Broad Band Input
Return Loss ±150Khz	≤ -26 dB
Isolation ± 1.2 MHz	N/B à B/B ³ 30 dB B/B à N/B ³ 40 dB
Number of Inputs	3
Number of Outputs	1
Connectors	Narrow Band Input N female (Opt. 7/16”) Broad Band Input N female (Opt. 7/16” – 7/8”) Output 7/8” (Opt. N - 7/16”)
Max Power	Narrow Band Input 500 -1000W Broad Band Input 4000W
Working Temperature	-20°C ÷ +50°C
Colour	Enamel gray ral 7001
Materials	Aluminium, Brass, Copper, PTFE, Stainless Steel, Silvering (min 12µm thickness)

FEATURES 

• Distortion – Free Transmission 

• Double Balanced Bridge 

• Frequency Independent Input Impedance 

• Low Loss, High Isolation 

• Natural Convection 

• Frequency at broadband input can be varied without retuning band-pass cavity filters 

• Broadband input can be used as spare input for expansion without requiring modifications of existing band-pass cavity filters 

• If narrow band input is the only one being used, an extremely high coupling attenuation (directional coupler attenuation plus filter attenuation) can be achieved for very small frequency spacing