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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