Message:22634 In: TECH.WW
From: G8MNYDate: Tue, 19 May 26 06:44:00 Z
Newsgroups: TECH.WW
Subject: 50ê - 200ê HF Balun
Message-ID: <60113_GB7CIP>
Path: N2MH4|GB7BED|K1AJD|LU9DCE|LU4ECL|VK4OT|VK6ZRT|GB7CIP
R:260520/2123Z 31387@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260519/0648Z 11535@GB7BED.#21.GBR.EU LinBPQ6.0.25
R:260519/0647Z 8512@K1AJD.#AUG.GA.USA.NOAM LinBPQ6.0.25
R:260519/0647Z 13868@LU9DCE.TOR.BA.ARG.SOAM LinBPQ6.0.25
R:260519/0647Z @:LU4ECL.LP.BA.ARG.SOAM #:46693 [LA PLATA] FBB7.00e
R:260519/0647Z @:VK4OT.#NQ.QLD.AUS.OC #:17776 [Townsville] $:60113_GB7CIP
R:260519/0645Z @:VK6ZRT.#BUN.#WA.AUS.OC #:39641 [Boyanup] $:60113_GB7CIP
R:260519/0644Z @:GB7CIP.#32.GBR.EURO #:60113 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
Here is 4:1 balun for HF freq`s (New Mar 05)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
At this ratio the ferrite only has to handle 50% of the RF power!
Turns Ratio 10:20 giving a Z ratio of 1:4
e.g. 10 turns for 50ê, 20 turns for 200ê Balanced.
ÚÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄo
³ ³10 0
³ ³Ú¿Ú¿Ú¿Ú¿Ú¿Ú¿Ú¿Ú¿Ú¿ÚÄÄÄ¿
³ ÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙ ³ 200ê
50ê Txr ³ ß ³ ±±±±±±±±±±±±±±±±±±±± ³
Unbalanced ÀÄÂÄÙ ±±±±±±±±±±±±±±±±±±±± ³ Balanced
³ Ú¿Ú¿Ú¿Ú¿Ú¿Ú¿Ú¿Ú¿Ú¿Ú¿ ³
³ ³ÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÄÄÄ)ÄÄÄÄÄo
³ ³10 0 ³
ÀÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
10 bifilair turns on a Amidon T 200-2 TOROID CORE. Make sure they are phase &
connected correctly.
Why Don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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