[Lowfer] Ultimate LOWFER Transmitter?

[Ed Phillips]

> > This is the principle behind multiple tuned vertical radiator systems of
> the
> > type used at VLF stations such as SAQ, for example.

	If you'll look at a typical schematic you'll see that the arrangement
really involves using a number of ground circuits in parallel, reducing
the ground losses.

> I am not sure if I am being subject to a gigantic leg-pull but here goes.
> 
> So you are saying that if I start with a typical LF antenna with say 1%
> efficiency and feed it with say 1 watt (10mW radiated).

	For a 50 foot top loaded tower to get even 1% efficiency would require
a ground resistance of around three ohms and no other circuit losses. 
That would really be a miracle for a typical lowerfer installation, but
think a few guys are just about doing it.



> I would be interested in a rigorous explanation (no resistors and batteries
> please :-) which further details the claimed doubling of efficiency for
> doubling of independant radiators.    Of course we are not talking about
> arrays of such a size as to have a directional effect.
> 
> 73s Steve Olney VK2ZTO

	Even small arrays can have some directional properties, and some
receiving sites use arrays of spaced loops to minimize interference.  Of
course, there is no gain.

Ed

Ed