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LF: Re: antenna calculation..help needed

from [PA0WFO] [Permanent Link][Original]
To: <[email protected]>
Subject: LF: Re: antenna calculation..help needed
From: "PA0WFO" <[email protected]>
Date: Wed, 13 Sep 2006 21:20:13 +0200
Delivered-to: [email protected]
References: <000801c6d757$0c6af2e0$60be3b3e@fujitsu>
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Hello Dick ,
To match a resistive load of 36 Ohms to 50 Ohms you need a L network consisting of  a coil of 0,4 microH from your TX to the antenna and a capacitor of 195 pF from the 50 Ohms side to ground ( freq, 10,140 Mhz ) as calculated with the L matching network calculator ( supplied with the ARRL antennabook ) . I use this calculator quite often with good results . I will send you the program ( Old MS DOS ) in a seperate E-mail .
73, William PA0WFO
----- Original Message -----
From: Dick
Sent: Wednesday, September 13, 2006 7:06 PM
Subject: LF: antenna calculation..help needed

Hello all,
 
It's off topic, but as I can't find it on the net I'll ask it here.
 
I want to modify an old 27MHz CB antenna to an quarter wave vertical for 30m (10.14MHz)
 
Diameter is tapering from 26 to 15mm.
 
Question: what length should it have? I suppose 0.25 wavelength x 0.96 or so...
 
Sofar not a big problem, but as I will use 36 radials direct on the ground, it's radiation resitance will be
around 36Ohm.
 
To match this to 50Ohm I can use a series capacitor, but what value this should be??
 
Who can tell me?
 
73
 
Dick, pa4vhf
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