9:1 unun question
 

I was wondering if the toroid I was going to bust out of an old broken icf
2001 would work for the 9:1 matching transformer I was building. And does
anyone know how to wind a toroid with two holes?

Brian

"Brian" wrote in message
nk.net...
I was wondering if the toroid I was going to bust out of an old broken icf
2001 would work for the 9:1 matching transformer I was building. And does
anyone know how to wind a toroid with two holes?

Brian

Don't know what an ICF2001 is, but what you are describing is a binocular
core- these make a FAR superior 9:1 than do classic toroidal cores. 1.5:1
VSWR BW will be nearly 10X wider with a binocular core than toroidal.
In a binocular core 1 turn is counted when the wire traverses each hole 1X.
Dale W4OP

Brian wrote:

I was wondering if the toroid I was going to bust out of an old broken icf
2001 would work for the 9:1 matching transformer I was building. And does
anyone know how to wind a toroid with two holes?

Brian

First, I'd sell the 2001 to someone that wants one for parts. If you
don't know what circuit of the 2001 the torroid is in, it might not be
suitable for HF use. You can buy 'binocular' torroids for a reasonable
price on -Dan's Small Parts- website (below). Look for a #43 ferrite
composition for HF use. Get one about 12-mm (0.5-inch) long.

http://www.danssmallpartsandkits.net/


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When winding a binocular core do you have to keep the windings on opposite
sides of one another. Anyone have a diagram, just trying to get a mental
image.

Brain
"starman" wrote in message
...
Brian wrote:

I was wondering if the toroid I was going to bust out of an old broken
icf
2001 would work for the 9:1 matching transformer I was building. And
does
anyone know how to wind a toroid with two holes?

Brian

First, I'd sell the 2001 to someone that wants one for parts. If you
don't know what circuit of the 2001 the torroid is in, it might not be
suitable for HF use. You can buy 'binocular' torroids for a reasonable
price on -Dan's Small Parts- website (below). Look for a #43 ferrite
composition for HF use. Get one about 12-mm (0.5-inch) long.

http://www.danssmallpartsandkits.net/


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BRIAN,

Read the "Binocular Cores -=V=- Toroidal Cores"
http://lists.contesting.com/archives.../msg00001.html

Broadband Receiving Antenna Matching - Mark Connelly [WA1ION]
http://www.qsl.net/wa1ion/bev/bb_antenna_matching.pdf
Scroll Down to the Photo of the "Binocular Core Figure 2"

Check-Out "Balun Core" (Binocular = Two Hole)
Drawings, Table and Formula
http://www.catchnet.com.au/~rjandusi...un_core_1.html
Ferrite Core Formula = Number of Turns
http://www.catchnet.com.au/~rjandusimports/fe_form1.gif

Photos of Binocular Cores
http://www.catchnet.com.au/~rjandusi...es/balun_t.jpg

Balun and Transformer Core Selection
Scroll Down to the Photo of the "Beverage Matching Transformer"
http://www.w8ji.com/core_selection.htm

Take a Look at the "Ferrite Material Cross Reference"
- Manufacturers Equivalent Ferrite Materials
- Based on Initial Permeability (µi)
http://www.catchnet.com.au/~rjandusi.../xref_mat.html

Balun (Matching Transformer) Core Sources:
http://www.cwsbytemark.com/prices/wideband.php
http://www.surplussales.com/FerMisc/FerMisc-5.html
http://www.cmi-ferrite.com/Products/...res/baluns.htm


Last-But-Not-Least: Read the "Balun Reading List ( Long )"
http://groups.yahoo.com/group/SWL-AM...na/message/337
[ Shortwave Listeners (SWL) Antennas and AM & FM Antennas ]
"SWL-AM-FM-Antenna" eGroup on YAHOO !


iane ~ RHF
..
..
= = = "Brian"
= = = wrote in message news:fUiMb.3250 ...

When winding a binocular core do you have to keep the windings on opposite
sides of one another. Anyone have a diagram, just trying to get a mental
image.

Brain
"starman" wrote in message
...
Brian wrote:

I was wondering if the toroid I was going to bust out of an old broken
icf
2001 would work for the 9:1 matching transformer I was building. And
does
anyone know how to wind a toroid with two holes?

Brian

First, I'd sell the 2001 to someone that wants one for parts. If you
don't know what circuit of the 2001 the torroid is in, it might not be
suitable for HF use. You can buy 'binocular' torroids for a reasonable
price on -Dan's Small Parts- website (below). Look for a #43 ferrite
composition for HF use. Get one about 12-mm (0.5-inch) long.

http://www.danssmallpartsandkits.net/


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