To be precise, the stub's electrical length is from the center of the Tee
connector to the end of the stub. No big deal at HF but sure is at VHF/UHF.
If the Tee connector is the version with a male connector on the common
port, a double female connector is typically used to connect the stub and that
becomes part of the stub as well.
I know, splitting hairs here!
73,
Gerald K5GW
In a message dated 11/13/2013 10:50:31 A.M. Pacific Standard Time,
km5vi@flukey.cc writes:
>> 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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