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Diplexer Calculator (Bridged Tee)


To terminate your mixer output.



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.


Schema 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 = 6577 d

t2 = 200 ms

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