Tdonaly wrote:
The only way to resolve this is to make an antenna and see if it
will work the way you say Kraus, and you, say it will.

No need to build one, Tom. Diamond has already built one for me.
It's the model NR72B. On 2m, the coil acts as a normal loading
coil. On 70cm, the coil is a phase-reversing coil with 1/4WL
on the bottom and 1/2WL on the top. Kraus describes that exact
antenna on page 824 in Figure 23-21(c) of _Antennas_For_All_
Applications_, 3rd edition. Richard H. can verify that.

Cecil wrote,
Kraus describes the antenna. Diamond builds and markets the
antenna. Do you believe that Kraus is wrong AND Diamond is
engaging in fraudulent marketing practices? You might get
rich and famous by suing them. (Then again, they might just
laugh at your ignorance.)

My Comet 2x4MAX also has phase-reversing coils in it. This is
the 21st century, Tom. It's past time to BBQ your sacred cow.

It is well known that a 3/2WL center fed antenna, like the G5RV
on 20m, undergoes some current phase reversals. That's what gives
it the cloverleaf pattern on 20m. If we make a helical G5RV and
use it on 20m, do you think those phase reversals will go away
simply because we are now dealing with a coil? Please rethink
your position.

If I remember correctly, Tom Rauch tried this and couldn't get it to
work as it was supposed to.

When an experimenter believes something is not going to work, it
usually doesn't work. Any number of reasons come to mind.
--
73, Cecil, W5DXP


Cecil, coils work fine as long as everything is taken into account,
including the capacitance between the two radiators.
Tank circuits don't. I once thought up the same scheme, myself,
and felt pretty proud of myself until I found out it was ancient history.
By the way, capacitors work, too. Would you like to
show me how to make a half-wave capacitor? If your theory is
correct, you should be able to model a capacitor as a transmission
line, also.
The theory of coupled oscillators of all sorts is moderately interesting,
but you can't learn it by quoting Aristotle. The methods of 13th century
scholasticism have their limits. You can argue as much as you want
about "phase reversing coils" and such, but unless you've done some
math and tried to get the results of your math to ape reality through
experimentation, the probability of your understanding the subject matter
is very small.
Actually, Tom thought it was going to work, if I remember correctly.
That was a pretty dumb cheap-shot on your part, Cecil.
73,
Tom Donaly, KA6RUH