Subj : 1:1 HF Balun
To   : WW
From : G8MNY
Date : Sat Sep 07 2019 11:02 pm

G8MNY    TECH     07.09.19 06:15l 35 Lines 1164 Bytes #365 (0) @ WW
BID : 20569_GB7CIP
Subj: 1:1 HF Balun
Path: OK0NBR F3KT OK0NAG DB0ERF DB0RES DB0OVN DB0GOS ON0AR GB7CIP
Sent: 190907/0902Z @:GB7CIP.#32.GBR.EURO #:20569 [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?

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