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UT1HZM > TECH 05.12.20 13:30l 31 Lines 1000 Bytes #999 (0) @ WW
BID : 3287_UT1HZM
Read: GUEST
Subj: Re: Twinlead folded dipole for 2 meters
Path: IW8PGT<IZ3LSV<IQ5KG<I0OJJ<EA2RCF<LU9DCE<EC5W<PE1RRR<W9GM<GB7YEW<
F4BWT<US1GBF<US1GHQ<UT1HZM
Sent: 201205/1051Z 3287@UT1HZM.KREM.POL.UKR.EU BPQ6.0.20
Hello,
Also 200 to 50 Ohm transformer could be made from 100 Ohm 1/4 wave line.
Its possible to find 93 Ohm coax RG-62, its well for this transformer.
Or balanced 100 R line very simple to made from two pcs of 50 R coax.
Just connect its braids together on both ends and not more.
On one side, connect only central wires to the antenna terminals.
Other side central wires of line - connect to your feeder coax's center & braid
or to some socket (BNC or SO-239 etc) installed on small plastic box.
Not forget to install on begin of feeder coax some 1:1 balun, for example:
- put 4-5 ferrite cores or one ferrite sleeve (material-43 is ok);
- use standard ferrite clamp (TDK etc);
- just wind 5-6 turns of feeder (near end of 100 R line) on some plastic core,
diameter of 20-40mm is OK.
Not forget about velocity factor of size for transforming line!
If you use coax with full Polyethylene, use 1/4 wave * 0.66.
If coax with FoamPE (white color like snow) use factor * 0.78.
73, Sergej.
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