"Dave" wrote in message
...

"Roy Lewallen" wrote in message
...
Trying to phase two antennas that close together at that frequency range
will be an educational experience at best, but more likely just an
exercise in frustration unless you have much more patience than average.
Such an array will be hyper-sensitive to everything. You might be able to
fleetingly see a null after a lot of tweaking, but I seriously doubt
you'll even get that. A tiny change in frequency, wiggling of the whips,
or even movement in the vicinity of the whips will have a profound effect
on any null you might see.

If a null from a small antenna is what you want, you'd have much better
luck with a carefully constructed and balanced ("shielded") loop.

Roy Lewallen, W7EL

Quck question, Roy,

Would it matter if I "separated" the whips electrically with, say, 55 feet
of coax? (That's approx the length I get for RG-174 coax, which is
something like 1/8" in diameter, with a velocity vactor of .66 and working
with 9 MHz.) Just a thought, but I don't know whether it has any merit or
not. And I am thinking I could adjust that "length" with an RLC circuit
through which I sort of "tune" it. What say you? Is this line of thought
worth persuing? Or would wiggling he whips still throw everything off?

And I do seem to have a fair abount of patience with this sort of thing.
Been working on the current project for about 2 years, had it working on
and off, taking it apart occasionally to implement some new retrofit or
engineering change. I am on disability, and have nothing but time on my
hands.

Thanks for any feedback...

Dave



Forgot to mention one thing. Don't know if I said this before or not, but
this is of course for receive only. No transmitting with such a cob job...

Thanks,

Dave