>> Do I make the stub for the correct length, hooked to the tuner on the
output of the amp, or do I need to subtract the length from the output of
the exciter to the output of the tuner?
The stub's electrical length is from the "T" connection to the end of the
stub so no, you don't add in the direct feedline length to the length of the
stub. The direct feedline length, or more precisely, the position of the
stub along the feedline may be important depending on what you are trying to
accomplish with the stub - particularly if you are wanting to use the stub
to transform an impedance, in which case the stub would be placed on the
load side (non-resonant side) of the tuner. If you are wanting to do band
pass or attenuation with the stub then you would want to stub on the line
side (resonant side) of the tuner. What stub function(s) are you trying to
achieve?
Matt
KM5VI
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