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Re: [Amps] grid resonance

To: Tom W8JI <w8ji@w8ji.com>, dezrat@copper.net
Subject: Re: [Amps] grid resonance
From: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Reply-to: g3rzp@g3rzp.wanadoo.co.uk
Date: Thu, 3 Aug 2006 09:34:53 +0200 (CEST)
List-post: <mailto:amps@contesting.com>
Tom said:
>It's like measuring your feedline in the shack with a GDO to 
tell where the antenna connected at the other end is high 
impedance or low impedance! Why would anyone do that?<
I don't see what a GDO would tell you, but an impedance bridge would -  
although you would need to know the feedline characteristics. At one time, I 
did actually measure my feeders short and open to determine their electrical 
length and loss, and of course, from that, I could work out the antenna 
impedance.
>From which, the story starts that 'you can measure antenna impedance from the 
>shack' Somebody says how, and is told that 'you use an RF bridge and a signal 
>source' which when he passes it on turns into 'an RF bridge and GDO as a 
>signal source'  which becomes 'RF bridge and GDO' and before you know it, ' we 
>hold these truths self evident that you can measure antenna impedance from the 
>shack with a GDO, so help me God' .

73
Peter G3RZP
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