'Doc wrote:
Mark,
On 40meters, adding an 80 meter dipole to the 40 meter
loop won't 'mess' things up much. It'll change the radiation
pattern, make it sort of directional, kinda. No big deal.
But, on 80 meters, the 40 meter loop acts like a 1/2 wave
'short' between the two halves of the dipole. SWR goes up
close to around 500:1, the transmitter is looking at something
on the order of '300R - 2500J'. Not too good, and as for the
lower radiation angle, it really doesn't make a lot of
difference at that point.

Doc, ask yourself - why would the 80m signal rather flow into an
impedance of 300-j2500 than into an impedance of 70+j0? Answer:
it wouldn't. An 80m 1/2wl dipole in parallel with a 40m 1wl loop
is a perfectly acceptable configuration as far as feedpoint
impedances go.
--
73, Cecil http://www.qsl.net/w5dxp



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Cecil,
"Horse hockey"! Try it and see what happens.
Didn't say model it...try it.
'Doc

I have a 40 meter loop inside my 80 meter loop and have been running it for
3 years without any problems.

Both antennas are flat (no SWR) and there appears to be little to no
interaction between the antennas.

73,

Lee - K1NT

wrote in message
...
Hi group,
just wondering.... can I take a 40M delta loop and add an 80M dipole to
it?
Will there be interaction?
SWR problems?

Mark W4UDX

Lee,

Just curious, what do you feed it with and where (corner or side)? Also,
what are the shapes? I'm amazed at the flat SWR!

73, Al

"DXer" wrote in message
...
I have a 40 meter loop inside my 80 meter loop and have been running it
for
3 years without any problems.

Both antennas are flat (no SWR) and there appears to be little to no
interaction between the antennas.

73,

Lee - K1NT

wrote in message
...
Hi group,
just wondering.... can I take a 40M delta loop and add an 80M dipole to
it?
Will there be interaction?
SWR problems?

Mark W4UDX

The apex of the triangle is at 50 ft on a telescoping mast and I feet the
bottom right corner for vertical polarization.

40m is flat across the entire band .. 80m is flat from 3.500 to about 3.700
....

The base is about 5 ft off the ground ...

/lee - k1nt

"Al - VA3KAI" wrote in message
...
Lee,

Just curious, what do you feed it with and where (corner or side)? Also,
what are the shapes? I'm amazed at the flat SWR!

73, Al

"DXer" wrote in message
...
I have a 40 meter loop inside my 80 meter loop and have been running it
for
3 years without any problems.

Both antennas are flat (no SWR) and there appears to be little to no
interaction between the antennas.

73,

Lee - K1NT

wrote in message
...
Hi group,
just wondering.... can I take a 40M delta loop and add an 80M dipole
to
it?
Will there be interaction?
SWR problems?

Mark W4UDX

What does one use to provide impendence transformation(if needed) at
feedpoint for a dual or multiband loop antenna?
I have two...one cut for 20 meters that I wish to multiband and use
individual loops for each band from 20 thru 10 meters. Could I use a 2 to 1
balun at feedpoint to resolve the impendence match?
The second delta loop is top feed currently with twin lead...and had about
220 feet of wire in the loop. I would like to string in two more additonal
loops...one for 40 and one for 30 meters....
Currently both are fed with 450 ohm twin lead with a pair of old Johnson
Matchboxes.
"DXer" wrote in message
...
The apex of the triangle is at 50 ft on a telescoping mast and I feet the
bottom right corner for vertical polarization.

40m is flat across the entire band .. 80m is flat from 3.500 to about
3.700
...

The base is about 5 ft off the ground ...

/lee - k1nt

"Al - VA3KAI" wrote in message
...
Lee,

Just curious, what do you feed it with and where (corner or side)?
Also,
what are the shapes? I'm amazed at the flat SWR!

73, Al

"DXer" wrote in message
...
I have a 40 meter loop inside my 80 meter loop and have been running
it
for
3 years without any problems.

Both antennas are flat (no SWR) and there appears to be little to no
interaction between the antennas.

73,

Lee - K1NT

wrote in message
...
Hi group,
just wondering.... can I take a 40M delta loop and add an 80M
dipole
to
it?
Will there be interaction?
SWR problems?

Mark W4UDX