[Lowfer] VLF active antenna

[Chris Trask]

>
> > Does anyone have a copy of the October 2006 issue
> > of Lowdown and can somehow copy the Lankford ultralinear whip article?
>
> As soon as I can find it (hopefully this evening), I'll post it in the
LWCA
> Library and let everyone here know.  But I should add, "ultralinear" is
not
> really the right word, according to John Reed's test report.  It's better
> than some of the highest priced commercial units, but not nearly as good
as
> a couple of others, notably the Clifton Labs unit or Steve Ratzlaff's
> design.
>

    I took the Lankford design to task primarily due to the use of an
obsolete transistor (2N5160), plus the lack of temperature compensation for
the output stage.  Back then, the transistors I used (BFQ19, BFQ149) cost
about $1 each, but now they're down to about 50¢, so the total parts cost is
less than $4.


Chris Trask
N7ZWY / WDX3HLB
Senior Member IEEE
http://www.home.earthlink.net/~christrask/