petek, 3. januar 2020

FT 920 diplexer


To  improve  impedance mismatch between the first mixer and roofing filter  a diplexer has been added to properly terminate the roofing filter. The diplexer terminates the output impedance of the mixer to the input impedance of the roofing filter in a wide frequency range. 

Picture 1






I decided to insert a SMD diplexer at the input of Inrad roofing filter.  The added SMD diplexer was built  near  roofing filter. 

Picture 2





Warning !!!  You made this mods on your own risk. I am not responsible for any hardware failure.This modification requires a some soldering skill, possibly beyond that normally possessed by the average HAM. Professional assistance is advised if you are not confident that you have  this ability.


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