RadioBanter - View Single Post - SUPER J-POLE BEATS YAGI BY 1 dB

February 7th 05, 08:15 PM

wrote:
wrote:
You are lucky to see the gain you have, considering the lack
of decoupling...Or at least in that pix....Also, thats a
pretty lame yagi, so like you say, not really a fair test...

What lack of decoupling? It's got the
coax inductive choke on the input, 4 turns
of 4" diameter.

I don't recall seeing that in the picture. But even still, I
wonder if it's as good as a full 1/4 wave decoupling cone, or
radials...Much better than nothing though...

If you would read my posts more carefully,
you would be aware that the reason for the low
dBi is that the lobe is 180 degrees, and F/B
ratio limited to around 11dB.

I only read the first post...

My 3 el vertical yagi would eat that j pole for lunch, being
it has about 9.4 dbi gain...Or about 7.3 dbd....

So what, the Super J-pole in omnidirectional,
so that's not saying much for a Yagi. We could have
easily designed it with more gain, but the frontal
lobe would have been way narrower.

Yea, but if you are going to post a CAPS thread
claiming a j pole beats a yagi by 1 db, most are
going to assume the yagi isn't crippled up...
It's sort of Frackish.....:/

How broad or narrow is the front lobe
of your yagi? How many degrees? Much
smaller than 180 no doubt.

No doubt...

I'm not trying to rain on your parade, and surely
applaud you for building these, I just don't quite
get the purpose of such a comparison...Everyone
already knows what the gains of the antennas are..
Well, except for the de-tuned yagi... I mean,
is it really a surprise a collinear might beat
a yagi with about half the normal gain of the
NBS 3 el?
I'll bow out...I really have no problem with the
antenna, etc...I just wanted to stir it, being you
have this frackish thread title...

MK