On Tue, 25 Oct 2005 19:31:13 -0400, dxAce
wrote:



-=jd=-
Where does one find such a transformer? Why does it need to be at
least 1:1? What does that mean?

Where have you been?

http://www.universal-radio.com/catalog/antsup.html

Others available elsewhere, do a Google on 1:1 balun.

dxAce
Michigan
USA


The 1:1 is for matching a narrowband dipole to a coaxial cable. The
whole point of it is to keep both poles of the dipole ungrounded.. I
don't see how it is relevant.

JD,

Antennas and Grounds : Do It Step-by-Step !
http://groups.yahoo.com/group/Shortw...a/message/6009

Some sort of Matching Transformer at the junction of the Wire Antenna
Element and the Coax Cable Feed-in-Line is a good First-Step.

Mounting this Matching Transformer directly to the Top of a
Ground Rod is a good Second-Step.

The placing the Coax Cable on the ground or burying it
under the ground is a good Third-Step.

Finally using a 1:1 "Isolation" Matching Transformer {Coax-to-Coax}
that uses a common Ground and that is itself Grounded; where the
Coax Cable leaves the Ground and enters the House is a very good
Fourth-Step.

Plus don't forget the Shack's Own Ground System 'bonded' to the
House's Electrical System. [ STEP-ON-IT ! ]

antennas and grounds : do it step-by-step - iane ~ RHF
.
..
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/
.
.
.. .

On Wed, 26 Oct 2005 05:14:52 -0400, dxAce
wrote:



David wrote:

On Tue, 25 Oct 2005 19:31:13 -0400, dxAce
wrote:



-=jd=-
Where does one find such a transformer? Why does it need to be at
least 1:1? What does that mean?

Where have you been?

http://www.universal-radio.com/catalog/antsup.html

Others available elsewhere, do a Google on 1:1 balun.

dxAce
Michigan
USA


The 1:1 is for matching a narrowband dipole to a coaxial cable. The
whole point of it is to keep both poles of the dipole ungrounded.. I
don't see how it is relevant.

You didn't ask why it was relevant, 'tard... you asked where you could find one,
etc.

Go crawl back up your box canyon, you stupid stem, and stop being such a pest.

dxAce
Michigan
USA


No I didn't. Not unless JD is one of your MPD manifestations.

David wrote:

On Wed, 26 Oct 2005 05:14:52 -0400, dxAce
wrote:



David wrote:

On Tue, 25 Oct 2005 19:31:13 -0400, dxAce
wrote:



-=jd=-
Where does one find such a transformer? Why does it need to be at
least 1:1? What does that mean?

Where have you been?

http://www.universal-radio.com/catalog/antsup.html

Others available elsewhere, do a Google on 1:1 balun.

dxAce
Michigan
USA


The 1:1 is for matching a narrowband dipole to a coaxial cable. The
whole point of it is to keep both poles of the dipole ungrounded.. I
don't see how it is relevant.

You didn't ask why it was relevant, 'tard... you asked where you could find one,
etc.

Go crawl back up your box canyon, you stupid stem, and stop being such a pest.

dxAce
Michigan
USA


No I didn't. Not unless JD is one of your MPD manifestations.

Stuff a sock in it, you pesky little nutcase.

dxAce
Michigan
USA

-=jd=- wrote:

On Tue 25 Oct 2005 09:31:33p, clu wrote in message
:


Since you mentioned coaxial cable ... can I use the cable TV coaxial
cable coming into my house for broadband/TV as an antenna to my
shortwave radio?


It may or may not offer any improvement. I doubt it would hurt anything to
try, if only to satisfy curiosity. If you do try it, be sure and advise your
results.

Thank you for the "best practices" knowledge about disconnectig an
external antenna from the radio when not in use.

You said it's a good argument for having a transformer (at least 1:1) in
your feed line ... is a "feed line" the wire that acts as an antenna?
What would the diagram look like to attach a direct path to ground?


Look here for some good info:
http://members.aol.com/DXerCapeCod/z_transformers.pdf
http://www.hard-core-dx.com/nordicdx...lab/index.html

Someone else mentioned an antenna wire around the perimeter of my house
would most likely blow up the portable radio (either Sony ICF-7600GR or
AOR 8200 MKIII B). Any truth to that?


It won't blow-up your radio, but it could overload the front-end and possibly
damage it. You can make a home-made attenuator around a 10kOhm pot to deal
with overload. Here's a link to the basic idea:

http://www.radiohc.org/Distributions/Dxers/zipten.html

I don't know what a lghtning arrester is, but I can easily look it up,
thanks.

You mentioned you wrap your own transformers. I think that's neat. I'm
not an electronics guy, but I am eager to learn. Do you just take a ton
of thin copper wire and wrap it around a spool a billion times?


The hardest part is finding the toroids. After that, it just takes a few feet
of wire. Well, plus an enclosure of some type (PVC is cheap), and either
binding posts and/or coax connectors. See the transformer links above...

Here is a link to a newer John Bryant transformer article:

http://www.dxing.info/equipment/impe...ing_bryant.pdf

And here is a link to a review of a transformer I used to make based on the
earlier Bryant article:

http://www.iserv.net/~n8kdv/xfmr.htm

dxAce
Michigan
USA

And give up the Fun of "Cutting" the Coax Cable everytime
you cut the Grass )

One of the main things here is for those individuals who
disconnect their Coax Cable at the Antenna when not in-use.

If the Coax Cable is in the Air with the end disconnected
from the Antenna then the Coax Cable will itself become a
Lightning Attractor in a Storm.

Burying the Coax Cable just helps to reduce the Chances of
it becoming an Attractor.

DUH ! - Don't Bury the Coax Cable alone-side
the Under Ground Utilities - It Ain't Smart !


iane ~ RHF

Lawnmower season is over,as far as I am concerned anyway.
cuhulin