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G8MNY > TECH 27.12.25 11:05l 35 Lines 1164 Bytes #999 (0) @ WW
BID : 48130_GB7CIP
Subj: 1:1 HF Balun
Path: IZ3LSV<ED1ZAC<CX2SA<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 50ê, 10 turns for 50ê Balanced.
ÚÄÄÄÄÄÄÄ¿ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄo
³ ³10 ³5 0
³ ³Ú¿Ú¿Ú¿Ú´Ú¿Ú¿Ú¿Ú¿ÚÄÄÄ¿
³ ÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙ ³ 50ê
50ê Txr ³ ß ³ ±±±±±±±±±±±±±±±±±± ³
Unbalanced ÀÄÂÄÙ ±±±±±±±±±±±±±±±±±± ³ Balanced
³ Ú¿Ú¿Ú¿Ú¿Ú¿ ³
³ ³ÀÙÀÙÀÙÀÙÀÄÄÄ)ÄÄÄÄÄÄÄÄÄÄÄo
³ ³5 0 ³
ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÙ
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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