> Tried stub matching at 7MHz (d1=3490.4 mm, and d2=962.6mm) with unexpected results.
Rechecked assuming a 50 ohm cable instead of 75 ohm ones. Ignoring the velocity factor of 0.66, now we have d1=6275.5 mm, and d2=1587.5 mm.
]
This is a second opinion by:
http://www.amanogawa.com/archive/SingleStub/SingleStub-2.html
The solutions obtained are the same for both methods, implying this part of the job is O.K.
Note: The two Smith Charts are equivalent, because in the latter case, Z is converted to Y, and the r=1 circle is now considered to be the g=1 circle. It is also interesting that the solution #1 gives somewhat broader bandwidth than the solution #2 in this particular case. (See the last figure.)