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  • 50ê - 200ê HF Balun

    From G8MNY@21:5/101 to WW on Sat Sep 7 23:01:52 2019
    G8MNY TECH 07.09.19 06:15l 31 Lines 999 Bytes #365 (0) @ WW
    BID : 20570_GB7CIP
    Subj: 50Ω - 200Ω HF Balun
    Path: OK0NBR F3KT OK0NAG DB0ERF DB0RES DB0EEO DB0GOS ON0AR OZ5BBS CX2SA
    N3HYM GB7CIP
    Sent: 190907/0904Z @:GB7CIP.#32.GBR.EURO #:20570 [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 50Ω, 20 turns for 200Ω Balanced.

    ┌───────┬────────────────────────────o
    │ │10 0
    │ │┌┐┌┐┌┐┌┐┌┐┌┐┌┐┌┐┌┐┌───┐
    │ └┘└┘└┘└┘└┘└┘└┘└┘└┘└┘ │ 200Ω
    50Ω Txr │ ▀ │ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ │
    Unbalanced └─┬─┘ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ │ Balanced
    │ ┌┐┌┐┌┐┌┐┌┐┌┐┌┐┌┐┌┐┌┐ │
    │ │└┘└┘└┘└┘└┘└┘└┘└┘└┘└───)─────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?


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