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G8MNY > TECH 09.09.19 20:06l 38 Lines 1332 Bytes #999 (0) @ WW
BID : 20570_GB7CIP
Read: GUEST
Subj: 50ê - 200ê HF Balun
Path: IW8PGT<I3XTY<I0OJJ<I0OJJ<GB7CIP
Sent: 190907/0904Z @:GB7CIP.#32.GBR.EURO #:20570 [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 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 50ê, 20 turns for 200ê Balanced.
ÚÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄo
³ ³10 0
³ ³Ú¿Ú¿Ú¿Ú¿Ú¿Ú¿Ú¿Ú¿Ú¿ÚÄÄÄ¿
³ ÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙ ³ 200ê
50ê Txr ³ ß ³ ±±±±±±±±±±±±±±±±±±±± ³
Unbalanced ÀÄÂÄÙ ±±±±±±±±±±±±±±±±±±±± ³ Balanced
³ Ú¿Ú¿Ú¿Ú¿Ú¿Ú¿Ú¿Ú¿Ú¿Ú¿ ³
³ ³ÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÄÄÄ)ÄÄÄÄÄo
³ ³10 0 ³
ÀÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
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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