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