| |
HB9ABX > TECHNI 01.06.20 11:04l 30 Lines 1081 Bytes #999 (999) @ WW
BID : 16UDB0FHN02W
Read: GUEST
Subj: Current Balun
Path: IZ3LSV<IQ5KG<IR1UAW<IW2OHX<HB9ON<IW8PGT<IR2UBX<DB0RES<DB0OVN<DB0GOS<
DB0RBS<OE5XBL<OE2XZR<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
Read previous mail | Read next mail
| |
