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G8MNY  > TECH     15.10.26 18:10l 30 Lines 998 Bytes #8 (0) @ WW
BID : 8065_GB7CIP
Subj: 50� - 200� HF Balun
Path: JH4XSY<IW0QNL<HB9ON<HB9ON<PI8ZTM<VE3CGR<VE7ASS<VE2PKT<VE3KPG<GB7CIP
Sent: 261015/0855Z @:GB7CIP.#32.GBR.EURO #:8065 [Caterham Surrey GBR] $:8065_GB
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 50�, 20 turns for 200� Balanced.

             ﾚﾄﾄﾄﾄﾄﾄﾄﾂ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ﾄﾄo
             ｳ       ｳ10                0
             ｳ       ｳﾚｿﾚｿﾚｿﾚｿ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      200�
  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
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      Balanced
             ｳ       ﾚｿﾚｿﾚｿﾚｿ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ﾙﾀﾙﾀﾙﾀﾙﾀﾄﾄﾄ)ﾄﾄﾄﾄﾄo
             ｳ       ｳ10                0   ｳ
             ﾀﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ

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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