Message 22483 in TECH.WW
From: G8MNY
Date: Sun, 17 May 26 07:56:00 Z
Newsgroups: TECH.WW
Subject: Pawsey Stub Coax Balun
Message-ID: <59907_GB7CIP>
Path: N2MH4|GB7BED|GB7YEW|GB7RJJ|PI8ZTM|CX2SA|ED1ZAC|GB7CIP
R:260518/0134Z 31294@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260517/0804Z 11402@GB7BED.#21.GBR.EU LinBPQ6.0.25
R:260517/0803Z 18456@GB7YEW.#79.GBR.EURO LinBPQ6.0.24
R:260517/0803Z 13431@GB7RJJ.#79.GBR.EURO LinBPQ6.0.25
R:260517/0802Z @:PI8ZTM.#ZH1.NLD.EURO #:54610 [Den Haag] $:59907_GB7CIP
R:260517/0802Z @:CX2SA.SAL.URY.SOAM #:65107 [Salto] FBB7.00e $:59907_GB7CIP
R:260517/0800Z @:ED1ZAC.EAC.ESP.EU #:13848 [EANET1G.06] $:59907_GB7CIP
R:260517/0756Z @:GB7CIP.#32.GBR.EURO #:59907 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
By G8MNY (Updated Dec 04)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
This type of balun is to be found in most textbooks & many aerial designs. It
is a 1:1 balun & does not alter the impedance.
feed points. The dead coax is what it says, a shorted out at both ends bit that
wave back from the aerial where the braids join together. At the aerial end the
dead coax is connected to the feeder's inner.
centre is at RF ground & therefore can be connected to the feed coax outer
without any RF left on the outer of the coax skin.
Common mode Z is only high at the resonant frequency, where it eliminates any
outer feeder current on the unbalanced coax.
Z
Fo 3 Fo
Why don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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