OpenBCM V1.08-5-g2f4a (Linux)

Packet Radio Mailbox

IZ3LSV

[San Dona' di P. JN]

 Login: GUEST





  
G8MNY  > TECH     05.03.13 11:53l 32 Lines 1142 Bytes #999 (0) @ WW
BID : 14168_GB7CIP
Read: GUEST
Subj: 50ê - 72ê HF Balun
Path: IZ3LSV<IK2XDE<ON4HU<CX2SA<DB0ANF<UA6ADV<GB7CIP
Sent: 130304/2259Z @:GB7CIP.#32.GBR.EU #:14168 [Caterham Surrey GBR] $:14168_GB
From: G8MNY@GB7CIP.#32.GBR.EU
To  : TECH@WW

Here is 1.2:1 balun for HF freq`s                      (Updated Mar 05)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
At this turns ratio the ferrite has to handle 65% 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! 

Turns Ratio 10:12 giving a Z ratio of 1:1.44
e.g. 10 turns for 50ê, 12 turns for 72ê Balanced.

             ÚÄÄÄÄÄÄÄ¿       ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄo
             ³       ³10     ³6         0
             ³       ³Ú¿Ú¿Ú¿Ú´Ú¿Ú¿Ú¿Ú¿Ú¿ÚÄÄÄ¿
             ³       ÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙ   ³        72ê
  50ê Txr  ³ ß ³     ±±±±±±±±±±±±±±±±±±±±   ³      Balanced 
Unbalanced ÀÄÂÄÙ     ±±±±±±±±±±±±±±±±±±±±   ³       Dipole
             ³               Ú¿Ú¿Ú¿Ú¿Ú¿Ú¿   ³
             ³               ³ÀÙÀÙÀÙÀÙÀÙÀÄÄÄ)ÄÄÄÄÄÄÄÄÄÄÄo
             ³               ³6         0   ³
             ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ

  6 bifilair turns + 4 on Amidon T 200-2 TOROID CORE

Make sure the windings are phase & connected correctly.


Why Don't U send an interesting bul?

73 De John, G8MNY @ GB7CIP


Read previous mail | Read next mail


 23.12.2024 14:08:45lGo back Go up