Shortwave Radio Listening (SWL) Longwire Antenna Balun Question ?
 

On Mar 29, 5:37*am, Ian Jackson
wrote:
In message
, RHF
writes





On Mar 28, 1:16*pm, Ian Jackson
wrote:
In message , vangellis
writesThis link shows how I have "grounded"
the setup
http://www.geocities.com/qrp_baluns/LMZ-50-Ground.GIF

vangellis

It's interesting that they have one version which is described as a 10:1
impedance matching voltage transformer, for 50 ohm coax, and the other
described as a 9:1 voltage balun transformer, for 75 ohm coax. It could
be that they are essentially the same inside (why would they want to
make two different types?), but with different connectors. Neither are
actually acting as baluns (although they be using balun transformers
inside the can).

- Some time ago, there was report published of tests
- which compared the received signals levels with
- and without - this type of transformer.
- *From memory, it showed that, on most frequencies,
- there was a very noticeable increase of signal level
- into the receiver. Only on a minority of frequencies was
- there some (acceptable) reduction of level.
- I've had a quick Google, but haven't yet found this report.
- --
- Ian

IAN,

Read this Post : SWL Longwire + Low Noise Antenna
Connection + Grounding Is Key To Good Reception
Three Messages to Read -by- John Doty

http://groups.google.com/group/rec.r...bc6a2bf8acc12d

Follow the Links/URLs provided in the Message.
.
~ RHF
.

Thanks. There's certainly a lot of good reading there, and in the links
in your other posts today. The info particularly in

http://web.archive.org/web/200306090.../naswa/badx/an...
as/SWL_longwire.html

is exactly the sort of thing I was thinking about.
-
- However, there's one thing which I note (just a quick look)
- on several of the websites, and that is the transformer is
- repeatedly referred to as a 'balun'.
-
- It isn't. I suspect that it's because they are using the
- same transformer as the type used in a balun but,
- in this application, a balun it ain't!
- --
- Ian
-

Ian Jackson -read- The Magnetic Long-Wire Antenna Balun
- A Balun It Ain't ! - But It Works :o)

http://groups.google.com./group/rec....334b2122c8ddbf

iane ~ RHF

Shortwave Radio Listening (SWL) Longwire Antenna Balun Question ?
 

In article
,
RHF wrote:

On Mar 29, 5:37*am, Ian Jackson
wrote:
In message
, RHF
writes





On Mar 28, 1:16*pm, Ian Jackson
wrote:
In message , vangellis
writesThis link shows how I have "grounded"
the setup
http://www.geocities.com/qrp_baluns/LMZ-50-Ground.GIF

vangellis

It's interesting that they have one version which is described as a 10:1
impedance matching voltage transformer, for 50 ohm coax, and the other
described as a 9:1 voltage balun transformer, for 75 ohm coax. It could
be that they are essentially the same inside (why would they want to
make two different types?), but with different connectors. Neither are
actually acting as baluns (although they be using balun transformers
inside the can).

- Some time ago, there was report published of tests
- which compared the received signals levels with
- and without - this type of transformer.
- *From memory, it showed that, on most frequencies,
- there was a very noticeable increase of signal level
- into the receiver. Only on a minority of frequencies was
- there some (acceptable) reduction of level.
- I've had a quick Google, but haven't yet found this report.
- --
- Ian

IAN,

Read this Post : SWL Longwire + Low Noise Antenna
Connection + Grounding Is Key To Good Reception
Three Messages to Read -by- John Doty

http://groups.google.com/group/rec.r...bc6a2bf8acc12d

Follow the Links/URLs provided in the Message.
.

Thanks. There's certainly a lot of good reading there, and in the links
in your other posts today. The info particularly in

http://web.archive.org/web/200306090.../naswa/badx/an...
as/SWL_longwire.html

is exactly the sort of thing I was thinking about.
-
- However, there's one thing which I note (just a quick look)
- on several of the websites, and that is the transformer is
- repeatedly referred to as a 'balun'.
-
- It isn't. I suspect that it's because they are using the
- same transformer as the type used in a balun but,
- in this application, a balun it ain't!

Ian Jackson -read- The Magnetic Long-Wire Antenna Balun
- A Balun It Ain't ! - But It Works :o)

http://groups.google.com./group/rec....334b2122c8ddbf


This isn't hard to understand. This is a two part term, which refers to
the type of transformer. "BAL" refers to balanced and "UN" refers to
unbalanced so the possibilities are BALBAL, UNUN, or BALUN.

A long wire is unbalanced and a coax is unbalanced so the transformer
type you would use is a UNUN. If you had a dipole, which is balanced
connected to a coax you would use a BALUN.

--
Telamon
Ventura, California

Shortwave Radio Listening (SWL) Longwire Antenna Balun Question ?
 

On Mar 29, 12:40*pm, Telamon
wrote:
In article
,





*RHF wrote:
On Mar 29, 5:37*am, Ian Jackson
wrote:
In message
, RHF
writes

On Mar 28, 1:16*pm, Ian Jackson
wrote:
In message , vangellis
writesThis link shows how I have "grounded"
the setup
http://www.geocities.com/qrp_baluns/LMZ-50-Ground.GIF

vangellis

It's interesting that they have one version which is described as a 10:1
impedance matching voltage transformer, for 50 ohm coax, and the other
described as a 9:1 voltage balun transformer, for 75 ohm coax. It could
be that they are essentially the same inside (why would they want to
make two different types?), but with different connectors. Neither are
actually acting as baluns (although they be using balun transformers
inside the can).

- Some time ago, there was report published of tests
- which compared the received signals levels with
- and without - this type of transformer.
- *From memory, it showed that, on most frequencies,
- there was a very noticeable increase of signal level
- into the receiver. Only on a minority of frequencies was
- there some (acceptable) reduction of level.
- I've had a quick Google, but haven't yet found this report.
- --
- Ian

IAN,

Read this Post : SWL Longwire + Low Noise Antenna
Connection + Grounding Is Key To Good Reception
Three Messages to Read -by- John Doty

http://groups.google.com/group/rec.r...bc6a2bf8acc12d

Follow the Links/URLs provided in the Message.
.

Thanks. There's certainly a lot of good reading there, and in the links
in your other posts today. The info particularly in

http://web.archive.org/web/200306090.../naswa/badx/an....
as/SWL_longwire.html

is exactly the sort of thing I was thinking about.
-
- However, there's one thing which I note (just a quick look)
- on several of the websites, and that is the transformer is
- repeatedly referred to as a 'balun'.
-
- It isn't. I suspect that it's because they are using the
- same transformer as the type used in a balun but,
- in this application, a balun it ain't!

- - Ian Jackson -read- The Magnetic Long-Wire Antenna Balun
- - - A Balun It Ain't ! - But It Works :o)
- -
- - http://groups.google.com./group/rec....334b2122c8ddbf
-
- This isn't hard to understand. This is a two part term, which refers
to
- the type of transformer. "BAL" refers to balanced and "UN" refers to
- unbalanced so the possibilities are BALBAL, UNUN, or BALUN.
-
- A long wire is unbalanced and a coax is unbalanced so the
transformer
- type you would use is a UNUN. If you had a dipole, which is balanced
- connected to a coax you would use a BALUN.
-
- --
- Telamon
- Ventura, California
-

Telamon - Good Explanation. - We Agree ! :o) ~ RHF