Two Good Days Spent with Quads
 

"Jimmie D" wrote in message
...

"Owen Duffy" wrote in message
...
"Sal M. Onella" wrote in
:


"Jimmie D" wrote in message
...


Stacking two 100 ohm impedance quads is electrically about as easy as
it gets. An electrical 1/4wl of any good quality coax from each
antenna to a
T.
50 ohm cable to the shack.

Thanks. I would've thought it needed to be 1/4w/l of 75-ohm cable,
but
I'll try it.

You are right to question to advice Sal.

Of course with a 1/4wl with VSWR=2, the Zo does matter.

However, Jimmie might have meant each leg to be a 1/2wl (electrical)...
close wasn't it! In that case, Zo isn't critical.

Owen

Owen you are a good mind reader, sorry about the typo, should have been
1/2 wl.

Not to mention you would never get enough space between the antennas using
1/4wl sections.

Two Good Days Spent with Quads
 

Don't overlook that you can parallel two quads to get to 50 ohms as
well!



Much simpler solution, build 3 element quad with wide spaced elements and
you get 50 ohm impedance, good pattern/gain and simple antenna.

Yuri K3BU.us

Two Good Days Spent with Quads
 

"Yuri Blanarovich" wrote in message
...


Don't overlook that you can parallel two quads to get to 50 ohms as
well!



Much simpler solution, build 3 element quad with wide spaced elements and
you get 50 ohm impedance, good pattern/gain and simple antenna.

Well, there you go! I had it in the back of my head that adding appropriate
parasitics would pull the impedance down. My problem was that all I had to
fiddle with was the driven element and a reflector.

With apologies to Yuri, I may still try some of the stranger approaches --
simply to see what works and what doesn't.
(My approach to ham radio is like farmboys playing with dynamite, except you
don't usually kill nuthin'.)

Two Good Days Spent with Quads
 

Much simpler solution, build 3 element quad with wide spaced elements and
you get 50 ohm impedance, good pattern/gain and simple antenna.

Well, there you go! I had it in the back of my head that adding appropriate
parasitics would pull the impedance down. My problem was that all I had to
fiddle with was the driven element and a reflector.

With apologies to Yuri, I may still try some of the stranger approaches --
simply to see what works and what doesn't.
(My approach to ham radio is like farmboys playing with dynamite, except you
don't usually kill nuthin'.)

There probably is not anything new to done with Quads but please share
your experiments with us!

Some things I discovered:
1- Quad made from copper pipe gets heavy fast.
2- It is possible to match the driven element with Gammas, hairpins &
such but not worth the bother.
3- If nothing breaks when a Quad is loaded with ice it will probably
be all right after the ice melts.
4- Maintenance will be required frequently.
5- Stealth Quads are especially hard to do.
6- Lighter and more flexible is more durable.
7- If your transmitter will tolerate it, it will radiate well off of
design frequency but the pattern will be difficult to anticipate.
8- Due to the radiator being a closed loop the receive noise will be
down from most antennas.

John Ferrell W8CCW
"Life is easier if you learn to
plow around the stumps"