Message:22633 In: TECH.WW
From: G8MNYDate: Tue, 19 May 26 06:42:00 Z
Newsgroups: TECH.WW
Subject: 1:1 HF Balun
Message-ID: <60112_GB7CIP>
Path: N2MH4|GB7BED|GB7YEW|LU9DCE|LU4ECL|VK4OT|VK6ZRT|GB7CIP
R:260520/2123Z 31386@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260519/0648Z 11534@GB7BED.#21.GBR.EU LinBPQ6.0.25
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R:260519/0648Z 13867@LU9DCE.TOR.BA.ARG.SOAM LinBPQ6.0.25
R:260519/0647Z @:LU4ECL.LP.BA.ARG.SOAM #:46692 [LA PLATA] FBB7.00e
R:260519/0647Z @:VK4OT.#NQ.QLD.AUS.OC #:17775 [Townsville] $:60112_GB7CIP
R:260519/0645Z @:VK6ZRT.#BUN.#WA.AUS.OC #:39640 [Boyanup] $:60112_GB7CIP
R:260519/0642Z @:GB7CIP.#32.GBR.EURO #:60112 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
Here is 1:1 balun for HF freq`s (New May 09)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
At this turns ratio the ferrite has to handle 50% of the RF power! It is useful
where the unbalanced feeder's outer may be at a high Z & a choke balun will not
work. (e.g. up in the air)
Turns Ratio 10:10 giving a Z ratio of 1:1
e.g. 10 turns for 50ê, 10 turns for 50ê Balanced.
ÚÄÄÄÄÄÄÄ¿ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄo
³ ³10 ³5 0
³ ³Ú¿Ú¿Ú¿Ú´Ú¿Ú¿Ú¿Ú¿ÚÄÄÄ¿
³ ÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙ ³ 50ê
50ê Txr ³ ß ³ ±±±±±±±±±±±±±±±±±± ³
Unbalanced ÀÄÂÄÙ ±±±±±±±±±±±±±±±±±± ³ Balanced
³ Ú¿Ú¿Ú¿Ú¿Ú¿ ³
³ ³ÀÙÀÙÀÙÀÙÀÄÄÄ)ÄÄÄÄÄÄÄÄÄÄÄo
³ ³5 0 ³
ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÙ
5 trifilair turns on Amidon T 200-2 TOROID CORE
Make sure the windings are phase & connected correctly.
See my tech bul "Coiled Choke Balun for HF"
Why Don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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