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G8MNY > TECH 09.09.19 20:07l 43 Lines 1498 Bytes #999 (0) @ WW
BID : 20569_GB7CIP
Read: GUEST
Subj: 1:1 HF Balun
Path: IW8PGT<I3XTY<I0OJJ<I0OJJ<GB7CIP
Sent: 190907/0902Z @:GB7CIP.#32.GBR.EURO #:20569 [Caterham Surrey GBR]
>From g8mny%gb7cip.#32.gbr.euro@i0ojj.ampr.org Sat Sep 7 11:10:02 2019
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>From: g8mny@gb7cip.#32.gbr.euro
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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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