On Dec 23, 8:54 am, dxAce wrote:
John Smith wrote:
RHF wrote:
...
.......!.......

http://www.hard-core-dx.com/nordicdx...1balun.htmlAnd an alternative to that, and the method in use here, is to have a separate
ground coming off the balun and then ground the coax feed where it enters the
house.

Using that method there is no connection between the two windings on the toroid.

dxAce
Michigan
USA

DX Ace - Hope You Enjoyed "That Something Extra" ~ RHF
Read - The RF Systems Magnetic Longwire Balun
and N8KDV's 10:1 Matching Transformer
http://www.iserv.net/~n8kdv/xfmr.htm

On Dec 23, 10:07 pm, John Smith wrote:
wrote: ...

Get a Wellbrook.http://www.wellbrook.uk.com/longwire.html

Interesting instructions. Looks like the "correct way" utilizes a 9:1
voltage balun between feed and antenna and a 1:1 current balun (called
isolator "AFI 5030" in the diagram) between other end of feed and the rig.

Regards,
JS

JS - That's about right. ~ RHF

On Dec 23, 9:34 pm, wrote:
RHF wrote:
For One and All,
.
RF Systems "MLB" {Magnetic Longwire Balun} - What Is It ?snip
I've got one, not that I use it anymore. It seems to be the only balun
with low frequency specs. I did MW reception with it, but I never
compared it to the ham baluns.

- Get a Wellbrook.

M-Sushi - Is that like Get-A-Life ! ) ~ RHF

FWIW - The Wellbrook "Universal Magnetic Balun" [ UMB ]
is a Receiving Antenna Balun with a 9:1 impedance ratio.
http://www.wellbrook.uk.com/UMB.html

Note - Universal Magnetic Balun [UMB] is specifically designed
to Reduce Noise, especially mains borne, by isolating the feeder
winding of the Balun [Matching Transformer} from the Antenna.
http://www.wellbrook.uk.com/longwire.html
- - - Doing "IT" the Right Way !

On Dec 23, 10:07Â*pm, John Smith wrote:
wrote:Â* ...

Get a Wellbrook.http://www.wellbrook.uk.com/longwire.html

Interesting instructions. Â*Looks like the "correct way" utilizes a 9:1
voltage balun between feed and antenna and a 1:1 current balun (called
isolator "AFI 5030" in the diagram) between other end of feed and the rig.

Regards,
JS

JS,

The "Correct Way" to Install a Longwire Antenna and Balun
by Wellbrook - Using the Far-End Feed-Point Concept
http://groups.yahoo.com/group/Shortw.../message/11773

The "Correct Way" to Install a Longwire Antenna and Balun
by Wellbrook = http://www.wellbrook.uk.com/longwire.html
We have all most likely done it the wrong way more than once . . .

A key-point that Wellbrook makes is the Five Metre "Noise Zone"
that exists around a House and getting the Wire Antenna Element
away {out} from this area.
http://www.wellbrook.uk.com/longwire.html
Note - The above "Correct Way" installation will ensure that the
Wire Antenna Element is 'outside' the local Noise Zone which
extends up to Five Metres (5m) around the House. Also the
noise pickup is lower with the feeder close to the ground -or-
buried under the ground a few inches.
-Why- The Antenna and the Balun are within the Local Noise Zone
RFI & EMF {Interference Area} that surrounds most buildings up to
distance of Five Metres (5m) which is about 16 Feet.


all i ask for is five metres beyond the noise - iane ~ RHF
.
.
I-B Somewhere on "The Big Blue Marble"
http://en.wikipedia.org/wiki/The_Blue_Marble
{ Earth - The Third Planet from the Sun }
http://en.wikipedia.org/wiki/Third_planet_from_the_Sun
.
Shortwave Listener Antennas = http://tinyurl.com/ogvcf
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
SWL Antenna Group = http://tinyurl.com/ogvcf
.
The Shortwave Listener's Blessing :
SWL BLESSING = http://tinyurl.com/s2bjm
May You Never Tire of Listening to the Radio and Always
have Strong Signals and Noise Free Reception ~ RHF {ibid}
http://groups.yahoo.com/group/Shortw...a/message/9233
.
Tous Sont Bienvenus ! - - - Groupe par Radio
d'auditeur d'onde courte pour des Antennes de SWL
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
.
Alle Sind Willkommen ! - - - Shortwave Radiozuhörer
Gruppe für SWL Antennen
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
.
Tutti Sono Benvenuti ! - - - Gruppo Radiofonico
dell'ascoltatore di onda corta per le Antenne di SWL
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
.
Todos São Bem-vindos ! - - - Grupo de Rádio
do ouvinte do Shortwave para Antenas de SWL
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
.
Ð’Ñ�е Ð*адушны ! - - - Группа оператора
на приеме коротковолнового диапазона
Radio дл� Aнтенн SWL
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
.
¡Todos Son Agradables! - - - Grupo de Radio del oyente
de la onda corta para las Antenas de SWL
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
.
= = = = Plain Old American-English Translation = = = =
All are Welcome - - - To Join the Shortwave Listeners
(SWL) Antenna Group on YAHOO !
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
.
|
|
|
/ \
........!.......

wrote:
John Smith wrote:
wrote:
...
Get a Wellbrook.

http://www.wellbrook.uk.com/longwire.html

Interesting instructions. Looks like the "correct way" utilizes a 9:1
voltage balun between feed and antenna and a 1:1 current balun (called
isolator "AFI 5030" in the diagram) between other end of feed and the rig.

Regards,
JS

If the feeder is buried, (coax), then is the isolator required?
Brian


No. The capacitive coupling to ground should be more that sufficient to
offer a low ohmic resistance to ground.

If it was me, I'd still wrap a few turns around an old ferrite core
taken from a discarded am radio and construct a 1:1 current balun
against common mode. However, I'd also run my coax through pvc pipe
when going underground. In fact, I have a long run of coax from the
shack to the antenna farm done exactly that way.

JS

On 24 Dec 2006 00:32:08 -0800, "RHF"
wrote:



On Dec 23, 9:34 pm, wrote:
RHF wrote:
For One and All,
.
RF Systems "MLB" {Magnetic Longwire Balun} - What Is It ?snip
I've got one, not that I use it anymore. It seems to be the only balun
with low frequency specs. I did MW reception with it, but I never
compared it to the ham baluns.

- Get a Wellbrook.

M-Sushi - Is that like Get-A-Life ! ) ~ RHF

FWIW - The Wellbrook "Universal Magnetic Balun" [ UMB ]
is a Receiving Antenna Balun with a 9:1 impedance ratio.
http://www.wellbrook.uk.com/UMB.html

Note - Universal Magnetic Balun [UMB] is specifically designed
to Reduce Noise, especially mains borne, by isolating the feeder
winding of the Balun [Matching Transformer} from the Antenna.
http://www.wellbrook.uk.com/longwire.html
- - - Doing "IT" the Right Way !

How does it distinguish between noise and station signals?

Pretty smart balun.

Bob
k5qwg


.
.
. .

Bob Miller wrote:
On 24 Dec 2006 00:32:08 -0800, "RHF"
wrote:



On Dec 23, 9:34 pm, wrote:
RHF wrote:
For One and All,
.
RF Systems "MLB" {Magnetic Longwire Balun} - What Is It ?snip
I've got one, not that I use it anymore. It seems to be the only balun
with low frequency specs. I did MW reception with it, but I never
compared it to the ham baluns.

- Get a Wellbrook.

M-Sushi - Is that like Get-A-Life ! ) ~ RHF

FWIW - The Wellbrook "Universal Magnetic Balun" [ UMB ]
is a Receiving Antenna Balun with a 9:1 impedance ratio.
http://www.wellbrook.uk.com/UMB.html

Note - Universal Magnetic Balun [UMB] is specifically designed
to Reduce Noise, especially mains borne, by isolating the feeder
winding of the Balun [Matching Transformer} from the Antenna.
http://www.wellbrook.uk.com/longwire.html
- - - Doing "IT" the Right Way !

How does it distinguish between noise and station signals?

Pretty smart balun.

Bob
k5qwg

Much of the noise you encounter is generated in your own house. Any
balun allows you to run coax near these noise generators, which is
better than just running the bare wire antenna by them.




.
.
. .

I have to head on over across Highway 80 to Metrocenter Mall.Last minute
Christmas shopping stuff.
cuhulin,the last minute dude

In article . com,
wrote:

John Smith wrote:
wrote:
...
Get a Wellbrook.


http://www.wellbrook.uk.com/longwire.html

Interesting instructions. Looks like the "correct way" utilizes a 9:1
voltage balun between feed and antenna and a 1:1 current balun (called
isolator "AFI 5030" in the diagram) between other end of feed and the rig.

Regards,
JS

If the feeder is buried, (coax), then is the isolator required?
Brian

You may not need the isolator with the coax buried. There are to many
variables to know for sure such as the soil conductivity. Best bet is to
use one. You could also just clamp on some ferrite cores on the coax to
see if it makes a difference.

The diagram shows the antenna going back toward the house. This might be
OK if that part of the house is electrically quiet but if not you just
wasted your time with the work on the lead in. It would be better to
attach the antenna away from the house so the entire antenna is away
from noise sources.

--
Telamon
Ventura, California

On Dec 24, 8:57 am, wrote:
Bob Miller wrote:
On 24 Dec 2006 00:32:08 -0800, "RHF"
wrote:

On Dec 23, 9:34 pm, wrote:
RHF wrote:
For One and All,
.
RF Systems "MLB" {Magnetic Longwire Balun} - What Is It ?snip
I've got one, not that I use it anymore. It seems to be the only balun
with low frequency specs. I did MW reception with it, but I never
compared it to the ham baluns.

- Get a Wellbrook.

M-Sushi - Is that like Get-A-Life ! ) ~ RHF

FWIW - The Wellbrook "Universal Magnetic Balun" [ UMB ]
is a Receiving Antenna Balun with a 9:1 impedance ratio.
http://www.wellbrook.uk.com/UMB.html

Note - Universal Magnetic Balun [UMB] is specifically designed
to Reduce Noise, especially mains borne, by isolating the feeder
winding of the Balun [Matching Transformer} from the Antenna.
http://www.wellbrook.uk.com/longwire.html
- - - Doing "IT" the Right Way !

How does it distinguish between noise and station signals?

Pretty smart balun.

Bob
k5qwg

- Much of the noise you encounter is generated in your own house.

-R- That is true.

- Any balun allows you to run coax near these noise generators,
- which is better than just running the bare wire antenna by them.

-R- OK - But why not move the Balun and Wire Antenna
Element out-and-away from the house and the noise.

Again a key-point that Wellbrook makes is the Five Metre (5m)
{which is about 16 Feet} "Noise Zone" that exists around a
House and getting the Wire Antenna Element away {out} from
this area. = http://www.wellbrook.uk.com/longwire.html

yes i said it again - iane ~ RHF