Dave

Nice site, I like the "white paper" approach as I prefer the info without
the glitter. I've only read a few items and I
quote: "This is a plot of the attenuation provided by the stub. You can see
that it provides about 32db of attenuation at 28.25Mhz. " I've noticed that
the literature I've purused indicates that stubs either attenuate or reject.
None say reflect! I don't want to get into a discussion of word definitions
becasue reflect and feject are close but attenuate is not in the same class.
Comments...

--
73
Hank WD5JFR

"Dave" wrote in message
news

"Henry Kolesnik" wrote in message
...
I know that a shorted 1/4 wave stub exhibits a very high impedance.
But
for the 2nd harmonic it's a 1/2 wave stub and exhibits a very low
impedance
or a short. There are claims that this can be used to filter the even
harmonics. Shorts can't diisipate power and must reflect, so how does
a
stub work?

stubs work very nicely. you can get practical stub information at my web
site, including how to build a 40m to 15m 3rd harmonic stub filter:
http://www.k1ttt.net/technote/techref.html#filters

as you may have noticed by now you have kicked the proverbial hornets
nest.
reflections are a touchy word in this group, usually attracting the
endless
argument that travels from thread to thread. in time this will
deteriorate
into name calling and endless argument over reflections, interference,
virtual impedances, and a few other topics.