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Login: GUEST @ JH4XSY.14.JNET1.JPN.AS [Tsuchiura]

G8MNY  > TECH     19.05.26 15:52l 32 Lines 1144 Bytes #8 (0) @ WW
BID : 60111_GB7CIP
Read: GUEST
Subj: 50� - 72� HF Balun
Path: JH4XSY<JE7YGF<LU4ECL<VK4OT<VK6ZRT<GB7CIP
Sent: 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 50�, 12 turns for 72� Balanced.

             ﾚﾄﾄﾄﾄﾄﾄﾄｿ       ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄo
             ｳ       ｳ10     ｳ6         0
             ｳ       ｳﾚｿﾚｿﾚｿﾚｴﾚｿﾚｿﾚｿﾚｿﾚｿﾚﾄﾄﾄｿ
             ｳ       ﾀﾙﾀﾙﾀﾙﾀﾙﾀﾙﾀﾙﾀﾙﾀﾙﾀﾙﾀﾙ   ｳ        72�
  50� Txr  ｳ ﾟ ｳ     ｱｱｱｱｱｱｱｱｱｱｱｱｱｱｱｱｱｱｱｱ   ｳ      Balanced 
Unbalanced ﾀﾄﾂﾄﾙ     ｱｱｱｱｱｱｱｱｱｱｱｱｱｱｱｱｱｱｱｱ   ｳ       Dipole
             ｳ               ﾚｿﾚｿﾚｿﾚｿﾚｿﾚｿ   ｳ
             ｳ               ｳﾀﾙﾀﾙﾀﾙﾀﾙﾀﾙﾀﾄﾄﾄ)ﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄo
             ｳ               ｳ6         0   ｳ
             ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ

  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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