In article 2O42g.1$HC3.0@trnddc07,
"Dale Parfitt" wrote:

wrote in message
oups.com...
If the antenna is amplified, you can play all sorts of games down
stream. If not, I would just, as Spike Lee says, "do the right
thing."

Since the length of the open end of the T is very short, it
probably won't matter much. A common trick is to make a notch
filter by inserting a T then putting an unterminated coax on the T
that is a quarter wave length (I think) of the frequency you want
to notch.

Note that the notches made with a single stub are rather broad and
even more important is the fact that it will also notch 3X, 5X, 7X
etc the fundamental. So, if one places a 1/4 wave open stub at 1.5
MHz to reduce an AM station, notches will also occur at 4.5MHz,
7.5MHz, 10.5MHz, etc. i.e. a real mess.

Yes, the odd harmonics 3, 5, 7, 9, et sequentia look like a 1/4 wave
stub.

--
Telamon
Ventura, California