Hi, folks (and maybe CW) - on his helpful hints pages, CW (kc7nod)
recommends the possible use of a balun (which I take to mean a
transformer?) at the coax-antenna junction of a loop antenna...

http://www.kc7nod.20m.com/loop.htm

In this instance, can anyone advise what the ratio on this would be?
4:1? Another value? I'd like to try out this antenna design, and the
balun idea too.

Thanks,
Bruce Jensen

bpnjensen wrote:

Hi, folks (and maybe CW) - on his helpful hints pages, CW (kc7nod)
recommends the possible use of a balun (which I take to mean a
transformer?) at the coax-antenna junction of a loop antenna...

http://www.kc7nod.20m.com/loop.htm

In this instance, can anyone advise what the ratio on this would be?
4:1? Another value? I'd like to try out this antenna design, and the
balun idea too.

My guess would be a 1:1 balun.

( I hope this is not a quiz) ;-)

dxAce

dxAce wrote:

bpnjensen wrote:

Hi, folks (and maybe CW) - on his helpful hints pages, CW (kc7nod)
recommends the possible use of a balun (which I take to mean a
transformer?) at the coax-antenna junction of a loop antenna...

http://www.kc7nod.20m.com/loop.htm

In this instance, can anyone advise what the ratio on this would be?
4:1? Another value? I'd like to try out this antenna design, and the
balun idea too.

My guess would be a 1:1 balun.

( I hope this is not a quiz) ;-)

This site says either a 1:1 or 4:1 :

http://www.radioworks.com/nloop.html

Also there may be some other ideas there for you to try.



dxAce

That's what I had in mind but experiment. You never know.

CW
KC7NOD
"dxAce" wrote in message
...


bpnjensen wrote:

Hi, folks (and maybe CW) - on his helpful hints pages, CW (kc7nod)
recommends the possible use of a balun (which I take to mean a
transformer?) at the coax-antenna junction of a loop antenna...

http://www.kc7nod.20m.com/loop.htm

In this instance, can anyone advise what the ratio on this would be?
4:1? Another value? I'd like to try out this antenna design, and the
balun idea too.

My guess would be a 1:1 balun.

( I hope this is not a quiz) ;-)

dxAce

bpnjensen wrote:

Hi, folks (and maybe CW) - on his helpful hints pages, CW (kc7nod)
recommends the possible use of a balun (which I take to mean a
transformer?) at the coax-antenna junction of a loop antenna...

http://www.kc7nod.20m.com/loop.htm

In this instance, can anyone advise what the ratio on this would be?
4:1? Another value? I'd like to try out this antenna design, and the
balun idea too.

Thanks,
Bruce Jensen

I use a 4:1 transformer on my horizontal loop.

bpnjensen wrote:
Hi, folks (and maybe CW) - on his helpful hints pages, CW (kc7nod)
recommends the possible use of a balun (which I take to mean a
transformer?) at the coax-antenna junction of a loop antenna...

http://www.kc7nod.20m.com/loop.htm

In this instance, can anyone advise what the ratio on this would be?
4:1? Another value? I'd like to try out this antenna design, and the
balun idea too.

Thanks,
Bruce Jensen

Find out some more antenna loop ideas he

http://www.dxzone.com/catalog/Techni...op/index.shtml

Assuming you are talking about a full wave loop antenna:

Maybe read the info at URL:
http://www.bloomington.in.us/~wh2t/loop.html
AND
http://hamgate.sunyerie.edu/~buffaloam/loop_antenna.htm

Depending on height above ground, a loop's impedance is nominally 100 ohms
So you can take it from there.

Baluns are described in detail at an ARRL site:
http://www.arrl.org/tis/info/pdf/8004019.pdf

More to them than just impedance matching -- such as common mode stuff

--
The generation of random numbers is too important to be left to chance.



"bpnjensen" wrote in message
om...
Hi, folks (and maybe CW) - on his helpful hints pages, CW (kc7nod)
recommends the possible use of a balun (which I take to mean a
transformer?) at the coax-antenna junction of a loop antenna...

http://www.kc7nod.20m.com/loop.htm

In this instance, can anyone advise what the ratio on this would be?
4:1? Another value? I'd like to try out this antenna design, and the
balun idea too.

Thanks,
Bruce Jensen

= = = (bpnjensen) wrote in message
= = = . com...

Hi, folks (and maybe CW) - on his helpful hints pages, CW (kc7nod)
recommends the possible use of a balun (which I take to mean a
transformer?) at the coax-antenna junction of a loop antenna...

http://www.kc7nod.20m.com/loop.htm

In this instance, can anyone advise what the ratio on this would be?
4:1? Another value? I'd like to try out this antenna design, and the
balun idea too.

Thanks,
Bruce Jensen


BJ,

I would venture to say 'if' you are using the Loop Antenna for
both Receiving and Transmission then a 1:1 or 2:1 Balun would
work well with a Coax Cable Lead-in-Line. An Antenna Tuner
would be required for Multi-Band operation.

"IF" the Loop Antenna is going to be used as a Receive "Only"
Antenna with a Coax Cable Feed-in-Line; then a 4:1 or even
a 9:1 Balun could be used with good Multi-Band results.

~ RHF
..

(RHF) wrote in message . com...

BJ,

I would venture to say 'if' you are using the Loop Antenna for
both Receiving and Transmission then a 1:1 or 2:1 Balun would
work well with a Coax Cable Lead-in-Line. An Antenna Tuner
would be required for Multi-Band operation.

"IF" the Loop Antenna is going to be used as a Receive "Only"
Antenna with a Coax Cable Feed-in-Line; then a 4:1 or even
a 9:1 Balun could be used with good Multi-Band results.

~ RHF

Thanks RHF, and everyone else too - these are great ideas and links.
I have managed to obtain quite good results on most of the bands from
6 MHz and up, and so I was going to concentrate my efforts with this
loop on the tropicals. I was going to start with about 220' of wire
in a loop around my rooftop and off into some backyard trees.

Based on what I've seen here and on the websites, it looks as though a
2:1 balun might be perfect, but a 4:1 may work about as well for a
slightly broader frequency coverage on a receive-only antenna; so I
may try these two first and then compare. One website says not to
use a balun at all (why?), so maybe I'll try it unmatched too.

I will post some observations when I get this thing up and running.

Thanks!
Bruce Jensen

In article ,
(bpnjensen) wrote:

(RHF) wrote in message
. com...

BJ,

I would venture to say 'if' you are using the Loop Antenna for both
Receiving and Transmission then a 1:1 or 2:1 Balun would work well
with a Coax Cable Lead-in-Line. An Antenna Tuner would be required
for Multi-Band operation.

"IF" the Loop Antenna is going to be used as a Receive "Only"
Antenna with a Coax Cable Feed-in-Line; then a 4:1 or even a 9:1
Balun could be used with good Multi-Band results.

~ RHF

Thanks RHF, and everyone else too - these are great ideas and links.
I have managed to obtain quite good results on most of the bands from
6 MHz and up, and so I was going to concentrate my efforts with this
loop on the tropicals. I was going to start with about 220' of wire
in a loop around my rooftop and off into some backyard trees.

Based on what I've seen here and on the websites, it looks as though
a 2:1 balun might be perfect, but a 4:1 may work about as well for a
slightly broader frequency coverage on a receive-only antenna; so I
may try these two first and then compare. One website says not to
use a balun at all (why?), so maybe I'll try it unmatched too.

The impedance changes according to the length of the loop relative to
the wavelength received. A full wave length loop within a wavelength of
ground is around 100 ohms so you would want to use a 2:1 BALUN to 50
ohm coax. If the loop is closer to half wave length then it will be
closer to 50 ohms and you would want to use a 1:1 BALUN.

--
Telamon
Ventura, California