Dear all,

I have, from an old bunch of computer wires in the disposal place of my office,
some ferrite cores such as the ones described here :
http://www.tdk.com.tw/ctl_pdf/ctl_1.1.pdf

I have two with the following spec : ZCAT2032-0930

I can possibly use one on the feed line to the radio to reduce some noise, but,
can this kind of material be used for building a balun/unun ? It is a tube of
ferrite instead of a toroid, so the windings might be a bit different...

Any hints out there ???

Thanks for your inputs,

Charly

Old computer power supplies might have toroids.

I guess this is a function of where you live. I can go to at least 3
stores and get ferrite cores off the shelf.


Charly wrote:
Dear all,

I have, from an old bunch of computer wires in the disposal place of my office,
some ferrite cores such as the ones described here :
http://www.tdk.com.tw/ctl_pdf/ctl_1.1.pdf

I have two with the following spec : ZCAT2032-0930

I can possibly use one on the feed line to the radio to reduce some noise, but,
can this kind of material be used for building a balun/unun ? It is a tube of
ferrite instead of a toroid, so the windings might be a bit different...

Any hints out there ???

Thanks for your inputs,

Charly

wrote:
Old computer power supplies might have toroids.

I guess this is a function of where you live. I can go to at least 3
stores and get ferrite cores off the shelf.


Yes sure : I can drive to some shops, but it will take me 2 or 3 hours way and
back...

I feel it is more funny to make my own, and I learn much more as well...

Charly

Even if you get the core off the shelf, you still need ot wind the
coil.

Any home-brew coil should be frequency swept. The parasitic capacitance
can really limit the performance.


Charly wrote:
wrote:
Old computer power supplies might have toroids.

I guess this is a function of where you live. I can go to at least 3
stores and get ferrite cores off the shelf.


Yes sure : I can drive to some shops, but it will take me 2 or 3 hours way and
back...

I feel it is more funny to make my own, and I learn much more as well...

Charly

I spent sixty dollars plus ten dollars S&H for a fifteen foot long long
computer to computer monitor VGA cable from www.si87.com in
Bozeman,Montana a few years ago.My cable has two (count em,two) big
ferrite toroids on it,,, to help prevent ghosting images on my Multisync
22 inch flat screen CRT computer monitor.I never stint on quality (I
dont give a d..n what it cost) thingys for my computer. www.google.com
cantaria.com Ragland Road.
cuhulin

Bill Mutch wrote:
http://www.amidoncorp.com/aai_ferritecores.htm

Thanks for the link Bill...

Charly

Charly - Check-Out these Items ~ RHF

TOROID FERRITE QRP HAM RADIO BALUN MATCHING TRANSFORMER
http://cgi.ebay.com/_W0QQitemZ5873245727

FERRITE BALUN QRP HAM RADIO CORES
http://cgi.ebay.com/_W0QQitemZ5873851905

Check-Out eBay Seller RF Junkie (rfjunkie)
ERICKSON ENGINEERING
http://search.ebay.com/_W0QQsassZrfjunkieQQhtZ-1

Amidon Associates produces a broad line of ferrite beads,
coil forms, cores and specialty items for the electronic
experimenter. {Via Universal-Radio.Com}
http://www.universal-radio.com/catalog/misc/amidon.html

#1542 FT 50-43 Ferrite Toroidal Core Qty = 3
0.500" x 0.281" x 0.188" AL=523

#1544 FT 82-43 Ferrite Toroidal Core Qty = 3
0.825" x 0.520" x 0.250" AL= 557

#0471 BN-43-202 Two Hole Core = Qty 4
0.525" x 0.150" x 0.550" x 0.295 AL=2890

Building a Matching Transformer ? Ferrite Core ?
TIP - Start with a "Know Quantity" and Build-from-there !


hope this helps - iane ~ RHF
.
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In article ,
Charly wrote:

Dear all,

I have, from an old bunch of computer wires in the disposal place of my
office,
some ferrite cores such as the ones described here :
http://www.tdk.com.tw/ctl_pdf/ctl_1.1.pdf

I have two with the following spec : ZCAT2032-0930

I can possibly use one on the feed line to the radio to reduce some noise,
but,
can this kind of material be used for building a balun/unun ? It is a tube of
ferrite instead of a toroid, so the windings might be a bit different...

Any hints out there ???

Thanks for your inputs,

Charly

Fig. 4 is your model. You will get 50 ohms impedance per turn at 10 MHz,
75 ohms at 20 MHz and 100 ohms at 30 MHz. Regressing the chart I
estimate 20 ohms at 5 MHz.

Two problems is BALUN/UNUN are a little more picky about the core and
these are two pieces. Better to have one piece core. Depending on the
type of impedance transformer you want to make this could be an OK value
of inductance for the frequencies you want it to operate on for a
voltage type but you would want more for a current type.

--
Telamon
Ventura, California

How about adapting (somehow or the other) computer monitor VGA cables
that already have a big ferrite core on each end of the cables to use
with radio antenna hookups? Only wondering.
cuhulin

Telamon wrote:
Fig. 4 is your model. You will get 50 ohms impedance per turn at 10 MHz,
75 ohms at 20 MHz and 100 ohms at 30 MHz. Regressing the chart I
estimate 20 ohms at 5 MHz.

Two problems is BALUN/UNUN are a little more picky about the core and
these are two pieces. Better to have one piece core. Depending on the
type of impedance transformer you want to make this could be an OK value
of inductance for the frequencies you want it to operate on for a
voltage type but you would want more for a current type.


BIG THANKS !!!

This the kind of info I was looking for....

Charly