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G8MNY > TECH 18.06.22 16:39l 43 Lines 1484 Bytes #999 (0) @ WW
BID : 23209_GB7CIP
Read: GUEST
Subj: 1:1 HF Balun
Path: IZ3LSV<ED1ZAC<EA5URD
Sent: 220605/0750Z @:EA5URD.EAMU.ESP.EU #:47624 XFBB7.07 Bid:23209_GB7CIP
R:220605/0747Z @:EA2RCF.EAVI.ESP.EU #:30511 [Vitoria] $:23209_GB7CIP
R:220605/0747Z 8344@LU9DCE.TOR.BA.ARG.SOAM LinBPQ6.0.20
R:220605/0747Z 46972@VE3CGR.#SCON.ON.CAN.NOAM LinBPQ6.0.22
R:220605/0745Z @:KA1VSC.#CCT.CT.USA.NOAM #:3660 [Glastonbury, CT]
R:220605/0741Z @:GB7CIP.#32.GBR.EURO #:23209 [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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