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G8MNY  > TECH     27.12.25 19:08l 35 Lines 1164 Bytes #8 (0) @ WW
BID : 48130_GB7CIP
Subj: 1:1 HF Balun
Path: JH4XSY<JE7YGF<LU4ECL<VK4OT<ZL2BAU<WG3K<N3HYM<VE3CGR<VE3KPG<GB7CIP
Sent: 251227/1000Z @:GB7CIP.#32.GBR.EURO #:48130 [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 50�, 10 turns for 50� 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5       0
             ｳ       ｳﾚｿﾚｿﾚｿﾚｴ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   ｳ        50�
  50� Txr  ｳ ﾟ ｳ     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   ｳ      Balanced
             ｳ               ﾚｿﾚｿﾚｿﾚｿﾚｿ   ｳ
             ｳ               ｳ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5       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ﾙ

  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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