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G8MNY > TECH 18.10.10 08:55l 94 Lines 3141 Bytes #999 (0) @ WW
BID : 64275_GB7CIP
Read: GUEST
Subj: 6 Uses of HF Trifilia winding.
Path: IZ3LSV<IV3YXW<HB9TVW<ON4HU<ON0BEL<GB7CIP
Sent: 101017/2258Z @:GB7CIP.#32.GBR.EU #:64275 [Caterham] $:64275_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : TECH@WW
By G8MNY (New Oct 10)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
A suitable RF ferrite ring or rod wound with 3 identical windings is quite
versatile & can be used in 6 different ways. Connect the 6 leads to a 6 way
connector block & wire up as needed.
(The . or ' indicates start or one end of winding)
1/ Choke Balun (uses 2 windings)
To work well at low frequencies the Inductance must be much greater than
25ê, & to work well at high frequencies the total wire length must be much
less than a 1/4 wave! Power handling of the core is 25% of the total!
.
Coax o)ÄÄCCCCCÄÄÄÄ
50ê ³ .===== 50ê Balanced
Unbalanced ÀÄÄCCCCCÄÄÄÄ (or unbalanced)
2/ 1:1 Isolation Transformer.(uses 2 windings)
To work well at low frequencies the Inductance must be much greater than
50ê, to work well at high frequencies the total wire length must be much
less than a 1/4 wave! The interwinding capacitance affects RF isolation.
Power handling of the core is 100% of the total!
Coax o)ÄÄ¿ ÚÄÄÄ
50ê ³ )||( 50ê
Unbalanced ³ )||( Floating
ÀÄÄÙ ÀÄÄÄ
3/ 1:2 Isolation Transformer.
To work well at low frequencies the Inductance must be much greater than
50ê, to work well at high frequencies the total wire length must be much
less than a 1/4 wave! The interwinding capacitance affects RF isolation.
Power handling of the core is 100% of the total!
ÚÄÄÄ
Coax o)ÄÄ¿||('
50ê ³ )||(_ 200ê
Unbalanced ³ )||(' Floating
ÀÄÄÙ||(
ÀÄÄÄ
4/ 1:2 Balun Transformer. (uses 2 windings)
To work well at low frequencies the Inductance must be much greater than
50ê, to work well at high frequencies the total wire length must be much
less than a 1/4 wave! Power handling of the core is 50% of the total!
Coax o)ÄÄÂÄÄÄÄÄÄ
50ê ³ ')||
³ )|| 200ê
Unbalanced ÀÄÄ´||
')|| Balanced
)||
ÀÄÄÄÄÄÄ
5/ 1:2 Transformer. (uses 2 windings)
To work well at low frequencies the Inductance must be much greater than
50ê, to work well at high frequencies the total wire length must be much
less than a 1/4 wave! Power handling of the core is 50% of the total!
ÚÄÄÄÄÄÄ
')||
)|| 200ê
Coax o)ÄÄ´||
50ê ³ ')|| Unbalanced
³ )||
Unbalanced ÀÄÄÁÄÄÄÄÄÄÄ
6/ 1:3 Transformer.
To work well at low frequencies the Inductance must be much greater than
50ê, to work well at high frequencies the total wire length must be much
less than a 1/4 wave! Power handling of the core is 75% of the total!
ÚÄÄÄÄÄÄ
')||
)||
³|| 450ê
')||
)||
Coax o)ÄÄ´||
50ê ³ ')|| Unbalanced
³ )||
Unbalanced ÀÄÄÁÄÄÄÄÄÄÄ
Why Don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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