Wideband Folded Loop Construction Details
 

Geltlemen,
I have been considering the Wideband Folded Loop (WFL) for a couple of
weeks now to use as a secondary antenna when talking with all of the
local yocals who are spread out on 40 and 75 and 80 mtrs. I have seen
the photographs of the assembled antenna, BUT, no dimentions and by
reducing the physicical size of the antenna, I'm guessing the multiple
dimentions must be pretty tight to function as a no tuner 1.5 to 30 mHz.
Any help would be greatly appreciated. Thanks

Butch KF5DE

Wideband Folded Loop Construction Details
 

Hi Butch

Are you talking about the terminated folded dipole antenna?

Mr Cebik has a rundown on them at;

http://www.cebik.com/wire/wbfd.html

and says that the antenna is "typically" 90ft long for 80-10m. There is
however a non trivial loss at 80m you may want to check on.

If you like "no tuner" also consider Cecils w5dxp's doublet at;

http://www.qsl.net/w5dxp/notuner.htm

That uses sections of 450 ohm feedline that are swicthed in and out of
circuit.

Cheers Bob W5/VK2YQA

Butch Magee wrote:


Geltlemen,
I have been considering the Wideband Folded Loop (WFL)

Wideband Folded Loop Construction Details
 

Hello Bob and tnx for the reply. Check out http://www.rys.nl/wfl.html

this one doesn't look like a dipole and a 7.5 by 1 meter space is all
the space it takes up. There are no close up photos of the
configuration, and can't tell where feed point is. I'm just full of no
information today :o) I did a google search for wideband folded loop
antenna, and was presented with this beauty of an antenna, but, like I
said, no wiring details and it sells for 400.00!! You just must roll
your own.

Butch




Bob Bob wrote:
Hi Butch

Are you talking about the terminated folded dipole antenna?

Mr Cebik has a rundown on them at;

http://www.cebik.com/wire/wbfd.html

and says that the antenna is "typically" 90ft long for 80-10m. There is
however a non trivial loss at 80m you may want to check on.

If you like "no tuner" also consider Cecils w5dxp's doublet at;

http://www.qsl.net/w5dxp/notuner.htm

That uses sections of 450 ohm feedline that are swicthed in and out of
circuit.

Cheers Bob W5/VK2YQA

Butch Magee wrote:



Geltlemen,
I have been considering the Wideband Folded Loop (WFL)

Wideband Folded Loop Construction Details
 

Hi Butch

Okay it looks like a T2FD that has been folded over. Usually they have a
load resistor (600 ohms maybe) and a toroid matching transformer at the
feedpoint. (The antenna is close to 600 ohms without the transformer)
Cebik explains how much loss this system incurs so you can make some
judgements from that. The smaller capture area than a "real" T2FD may
mean another 3-6dB or so of loss.

You might like also to look at a magloop generally. ie a loop antenna
with a tuning cap at one location. I have seen these described as
working well over a 2:1 freq range (eg 80 and 40m) and a few quoting
3:1. You usually need to remote tune them though with something like a
srewdriver motor. As mentioned in the advert one of their claims to fame
is lower received noise and with the tuning less off frequency
interference issues.

Whats your application, what bands do you want to cover and what space
do you have?

Bob

Butch Magee wrote:


Hello Bob and tnx for the reply. Check out http://www.rys.nl/wfl.html
this one doesn't look like a dipole and a 7.5 by 1 meter space is all
the space it takes up. There are no close up photos of the
configuration, and can't tell where feed point is. I'm just full of no
information today :o) I did a google search for wideband folded loop
antenna, and was presented with this beauty of an antenna, but, like I
said, no wiring details and it sells for 400.00!! You just must roll
your own.

Butch