Message:22632 In: TECH.WW
From: G8MNYDate: Tue, 19 May 26 06:40:00 Z
Newsgroups: TECH.WW
Subject: 50ê - 72ê HF Balun
Message-ID: <60111_GB7CIP>
Path: N2MH4|GB7BED|GB7YEW|LU9DCE|LU4ECL|VK4OT|VK6ZRT|GB7CIP
R:260520/2123Z 31385@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260519/0648Z 11533@GB7BED.#21.GBR.EU LinBPQ6.0.25
R:260519/0648Z 18570@GB7YEW.#79.GBR.EURO LinBPQ6.0.24
R:260519/0648Z 13866@LU9DCE.TOR.BA.ARG.SOAM LinBPQ6.0.25
R:260519/0647Z @:LU4ECL.LP.BA.ARG.SOAM #:46691 [LA PLATA] FBB7.00e
R:260519/0647Z @:VK4OT.#NQ.QLD.AUS.OC #:17774 [Townsville] $:60111_GB7CIP
R:260519/0645Z @:VK6ZRT.#BUN.#WA.AUS.OC #:39639 [Boyanup] $:60111_GB7CIP
R:260519/0640Z @:GB7CIP.#32.GBR.EURO #:60111 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
Here is 1.2:1 balun for HF freq`s (Updated Mar 05)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
At this turns ratio the ferrite has to handle 65% 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!
Turns Ratio 10:12 giving a Z ratio of 1:1.44
e.g. 10 turns for 50ê, 12 turns for 72ê Balanced.
ÚÄÄÄÄÄÄÄ¿ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄo
³ ³10 ³6 0
³ ³Ú¿Ú¿Ú¿Ú´Ú¿Ú¿Ú¿Ú¿Ú¿ÚÄÄÄ¿
³ ÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙ ³ 72ê
50ê Txr ³ ß ³ ±±±±±±±±±±±±±±±±±±±± ³ Balanced
Unbalanced ÀÄÂÄÙ ±±±±±±±±±±±±±±±±±±±± ³ Dipole
³ Ú¿Ú¿Ú¿Ú¿Ú¿Ú¿ ³
³ ³ÀÙÀÙÀÙÀÙÀÙÀÄÄÄ)ÄÄÄÄÄÄÄÄÄÄÄo
³ ³6 0 ³
ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
6 bifilair turns + 4 on Amidon T 200-2 TOROID CORE
Make sure the windings are phase & connected correctly.
Why Don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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