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HB9ABX > TECHNIK 01.06.20 10:56l 30 Lines 1081 Bytes #999 (999) @ WW
BID : 16UDB0FHN02W
Read: GAST
Subj: Current Balun
Path: DB0FFL<DB0FHN
Sent: 200601/0956z @:DB0FHN.#BAY.DEU.EU [JN59NK Nuernberg] obcm1.07b12 LT:999
From: HB9ABX @ DB0FHN.#BAY.DEU.EU (Felix)
To: TECHNIK @ WW
Reply-To: HB9ABX @ HB9EAS.CHE.EU
X-Info: Sent with login password
Broadband current balun 1,8-30 MHz:
1.Version: for 100 Watt: -
Ferrite ring FT140-43 with RG58
(or FT114-43 with coax RG174, ok for 100W)
1 ring is sufficient, by using 2, the efficiency on 1,8 MHz will increase
you will need 2 rings for 200 W and RG 316.
With 2 rings, you place one over the other and make common windings through
both.
In contrast to the picture above: make on the left and on the right side each
4.5 turns!
(better is teflon coax RG316)
2. Version: for 1 Kilowatt: -
Ferrite ring FT240-43 with coax RG58
(better is teflon coax RG142)
Winding technique is important!
With coax from outside to the ferrite ring. Wind 4 1/2 turns on one
half of the ring, then through the ring to the other side and wind
again 4 1/2 turns.
The end of the winding should then be on the opposite position
of the beginning of the winding. (See picture).
Then, fix the winding with PVC tape.
73, Felix, HB9ABX
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