DAVE,
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FWIW - The smaller TV type Binocular (Two Hole) Ferrite
Cores will work OK. They can be build if you use small
enough Magnet Wire. However, If you live in an area that
has frequent Thunder and Lightening Storms and you have
a 50 Foot or more long Wire Antenna Element. You may
find that your Balun burns out very easily due to near
by T&L Strikes.
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FERRITE CORES :
Here are two Ferrite Cores that can be used to build
your own Matching Transformer.
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AMIDON - Cores, Beads, Rods and Balun Kits
http://www.universal-radio.com/catalog/misc/amidon.html
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Binocular (Two Hole) Core
For a 9:1 Matching Transformer:
- Antenna to Ground Primary Windings = 15 Turns
- Coax Cable Secondary Windings = 5 Turns
http://www.universal-radio.com/catalog/misc/0471.jpg
# 0471 - BN-43-202 Two Hole Core
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Ferrite Toroidal (Donut) Core
For a 9:1 Matching Transformer:
- Antenna to Ground Primary Windings = 30 Turns
- Coax Cable Secondary Windings = 10 Turns
http://www.universal-radio.com/catalog/misc/1544.jpg
# 3494 - FT114-43 Ferrite Toroidal Core
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Most Random Wire (Long Wire) Antennas use a so called
Magnetic Longwire Balun (MLB). These are 9:1 Matching
Transformenrs as shown here; and are in-fact "UnUns".
http://www.hard-core-dx.com/nordicdx.../9_1balun.html
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THREE-TO-READ :
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* The Binocular [Ferrite Core] Matching Transformer {Balun]
http://groups.yahoo.com/group/Shortw...na/message/518
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* Building a Matching Transformer for SWL Antenna
using a Binocular Ferrite Core
http://groups.yahoo.com/group/Shortw...a/message/1650
http://groups.yahoo.com/group/Shortw...a/message/1647
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* Concerning the "Topic" of Binocular Core Matching
Transformers {Links-to-Read}
http://groups.yahoo.com/group/Shortw...a/message/1902
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READY-MADE - MATCHING TRANSFORMERS FOR RANDOM WIRE ANTENNAS:
[ So called Magnetic Longwire Baluns "MLBs" ]
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* 10:1 Shortwave Longwire Antenna Feeder #SWL-1
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=5743212456
This is designed for a Random Wire Antenna with a single
Grounding Point located/connected on the Coax Cable / Shack
Side of the MLB.
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* 10:1 Shortwave Longwire Antenna Feeder #SWL-1G
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=5743212647
This is designed for a Random Wire Antenna with the Primary
Grounding Point located/connected on the Antenna Side of the
MLB. (NOTE - The Coax Cable and Shack can also have another
Grounding Point.)
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READY-MADE - RANDOM WIRE ANTENNA WITH MLB
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* High-Z Shortwave Longwire Antenna - LWF-10
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=5742971284
This is a 80 Foot Random Wire Antenna Element coupled to
a MLB (#SWL-1); just add your Ground rod and Coax Cable
Feed-in-Line.
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NOTE - The above the Ready-Made Items are produced by
eBay Seller "RF Junkie" [Erickson Engineering].
http://members.ebay.com/ws/eBayISAPI.dll?ViewUserPage&userid=rfjunkie

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iane ~ RHF
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All are WELCOME at the Shortwave Listener (SWL) "Antenna Ashram"
http://groups.yahoo.com/group/Shortw...na/message/502
Some Say: On A Clear Day You Can See Forever.
I BELIEVE: On A Clear Night . . .
You Can Hear Forever and Beyond, The BEYOND !
[With the a Shortwave Listener SWL Antenna of your own making.]
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* * * EXTRACTED from "Grundig Satellit 800" eGroup on YAHOO !
eGROUP = http://groups.yahoo.com/group/Satellit800/
= = = In ,
= = = "daveinpoway" daveinpoway@h... wrote:
TV type Ferrite Cores / Ferrite Cores /
Magnetic Longwire Baluns (MLBs) and more . . .
http://groups.yahoo.com/group/Satellit800/message/8897
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Given that the ferrite in a VHF and/or UHF television balun
is most probably designed for those higher frequencies,
even better results would most likely result if you had
a ferrite core better suited for the SW bands.
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daveinpoway