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Re: LF: 9 kcs

from [Roger Lapthorn] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: 9 kcs
From: Roger Lapthorn <[email protected]>
Date: Wed, 17 Mar 2010 17:10:12 +0000
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Now your really talking Mal. We all hope you go ahead with this.

73s
Roger G3XBM

On 17 March 2010 16:45, mal hamilton <[email protected]> wrote:
If I get time and a NOV for 9 kcs my proposed approach for TX would be an IC 706 on 900 kcs divided by 100/driver chip TC 4427 and a couple of FETS class D for an output of a few hundred watts, designed for 50 ohms, 50 ohm coax to antenna 200 feet away from shack as at present for 137 and 500 kcs.
Use the existing 1/4 wave inv L for 500 plus 2 additional ones same spec all in parallel and base loaded by inductor to resonate on 9 kcs, use existing ground radial system not too elaborate. Antenna height is approx 100 ft vertical and the rest to make up the 1/4 wave is horizontal.
The speculators, gamblers and dreamers might be able to guess what distance I might cover.
Let me compare your figures !!
Assume pwr to be 400 watts at base of antenna.
Using 9 kcs figure for convenience, but 8970 kcs would prob be the qrg
 
 
de mal/g3kev
 
 



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