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G8MNY  > TECH     05.12.18 11:00l 35 Lines 1164 Bytes #6 (0) @ WW
BID : 47962_GB7CIP
Read: GUEST
Subj: 1:1 HF Balun
Path: ED1ZAC<ED1ZAC<GB7CIP
Sent: 181205/0957Z @:GB7CIP.#32.GBR.EURO #:47962 [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 50, 10 turns for 50 Balanced.

             Ŀ       o
                    10     5       0
                    ڿڿڿڴڿڿڿڿĿ
                               50
  50 Txr            
Unbalanced               Balanced
                            ڿڿڿڿڿ   
                            )o
                            5       0   
             

  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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