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LF: Re: Re: loops

To: "rsgb_lf_group" <[email protected]>
Subject: LF: Re: Re: loops
From: "Dave Sergeant" <[email protected]>
Date: Thu, 7 Mar 2002 09:42:38 -0000
References: <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: <[email protected]>
From Dave G3YMC
The main problem with transmitting loops is the enourmous current and
Voltage which is generated when exciting them with decent power. It's all
very well to put 1W into a loop but try 1kW and see what happens..... High Q
(which you MUST have for good efficiency) necessarily means high Voltage and
current.
This is true, but as WE0H comments the biggest problem is current rather than
voltage.  Calculations on my loop (not that much smaller than 40 ft square...)
indicate that 26A would be required at 400W input.  Using my method of 
capacitive
matching this would probably be unrealistic as the demands on the capacitors 
would be
excessive.  The current handling of the conductors is probably the least of the
worries.

I am currently driving my loop at 80W, and it seems quite happy at that level.

Dave G3YMC
[email protected]
[email protected]
http://www.dsergeant.btinternet.co.uk






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