On 17 March 2010 16:45, g3kev-Mal 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
