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G8MNY > TECH 28.12.25 17:40l 54 Lines 1643 Bytes #10 (0) @ WW
BID : 48194_GB7CIP
Subj: 50� - 200� HF Transformer
Path: JH4XSY<JE7YGF<LU4ECL<VK2RZ<VE3CGR<VE2PKT<VE3KPG<GB7CIP
Sent: 251228/0831Z @:GB7CIP.#32.GBR.EURO #:48194 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
Here is 4:1 Transformer for HF long wires (New Nov 09)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
THIS IS NOT A BULAN!
An auto-transformer may well make matching a long wire possable on AUTO ATUs
that do not have a good impedance range. (e.g. only for SWRs of < 3:1)
It is possable to rewire/switch a bulan to do this.
At this ratio the ferrite only has to handle 50% of the RF power!
Turns Ratio 5:10 giving a Z ratio of 1:4
e.g. 5 turns for 50�, 10 turns for 200� Balanced.
ﾚﾄﾄﾄﾄﾄﾄｿ
ｳ ｳ6 10
ｳ ｳﾚｿﾚｿﾚｿﾚｿﾚﾄﾄﾄﾄo
ｳ ﾃﾙﾀﾙﾀﾙﾀﾙﾀﾙ 200�
50� Txr ｳ ﾟ ｳ ｳｱｱｱｱｱｱｱｱ
Unbalanced ﾀﾄﾂﾄﾙ ｳｱｱｱｱｱｱｱｱ
ｳ ｳﾚｿﾚｿﾚｿﾚｿ
ｳ ﾀﾙﾀﾙﾀﾙﾀﾙﾀﾂﾄﾄﾄﾄo
ｳ 5 0 ｳ _ｳ_
ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ ///
Make sure they are phase & connected correctly.
In general a transformer turns ratio is square root of the Z/Z.
So for 600� to 50� that is �600/50 = �12 = 3.46 or 2:7 3:11 4:14 5:17 turns
etc.
An autotransformer tapped system where the lower turn is a tapping of the total
also the lower turns should be 2x thicker!
ﾚﾄﾄﾄﾄﾄﾄｿ
ｳ ｳ6 17
ｳ ｳﾚｿﾚｿﾚｿﾚｿﾚｿﾚｿﾚﾄﾄﾄﾄo
ｳ ﾃﾙﾀﾙﾀﾙﾀﾙﾀﾙﾀﾙﾀﾙ 600�
50� Txr ｳ ﾟ ｳ ｳｱｱｱｱｱｱｱｱｱｱｱｱｱ
Unbalanced ﾀﾄﾂﾄﾙ ｳｱｱｱｱｱｱｱｱｱｱｱｱｱ
ｳ ｳﾚｿﾚｿﾚｿﾚｿ
ｳ ﾀﾙﾀﾙﾀﾙﾀﾙﾀﾂﾄﾄﾄﾄﾄﾄﾄﾄo
ｳ 5 0 ｳ _ｳ_
ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ ///
Why Don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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