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G8MNY  > TECH     06.12.18 08:00l 31 Lines 999 Bytes #4 (0) @ WW
BID : 48107_GB7CIP
Read: GUEST
Subj: 50 - 200 HF Balun
Path: ED1ZAC<ED1ZAC<NA7KR<ZL2BAU<N9PMO<ZS0MEE<GB7CIP
Sent: 181206/0650Z @:GB7CIP.#32.GBR.EURO #:48107 [Caterham Surrey GBR]
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 50, 20 turns for 200 Balanced.

             o
                    10                0
                    ڿڿڿڿڿڿڿڿڿĿ
                             200
  50 Txr            
Unbalanced               Balanced
                    ڿڿڿڿڿڿڿڿڿڿ   
                    )o
                    10                0   
             

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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