On 2007-09-27, Jimmie D (71.68.80.78) wrote in
message


"Navtex-Fan" wrote in message
...
On 2007-09-26, Richard Clark (67.168.144.41) wrote in
message


Anyway [gad this is abysmally distant from SWLing and QRM - Dirk, you
can't possibly still be with us can you?],

Sure Richard, I'm still listening in on this thread; I'm now thinking about
a 518KHz Gaussian antenna... :0)

[..]


Dirk I suspect the feed point impedance of your antenna is less than 1 ohm at
518Khz. This make a good ground imperative. With just a couple of ground rods
for a ground I suspect your ground impedance is probably around 20 ohms for
60hz and considerably higher for RF. Putting in 120 radials 1/4wl long would
be a tall order but perhaps you could add 20 or so as long as you can.


Jimmie

Thanks for the info, Jimmie, but installing radials of that size is
simply impossible in my garden.
I guess I'll have to accept it...

73's - Dirk