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calc_16a.php    6728 Bytes    12-02-2018 11:22:24


Diplexer Calculator (Bridged Tee)




A diplexer presents a broadband termination to e.g. a mixer, which is connected on the left side. Due to the series resonance circuit of C1 and L1, only a small bandwidth can pass to the next stage e.g. the if - amplifier, which needs only to present a good match for this frequency range. All other frequencies, above and below, 'see' the two 50 Ω resistors.



Diplexer


FREQUENCY

   [MHz]

IMPEDANCE

   [Ω]

Q

   [use 10 for RF, 2...4 for VHF]

C1

   [pF]

L1

   [nH]

C2

   [pF]

L2

   [nH]

RESISTOR

   [Ω]

   

 


Schema Diplexer


For a Q=10, the Bandwidth is about 1 MHz at 10 MHz Centerfrequency. (as expected)





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t1 = 6459 d

t2 = 169 ms

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