[Lf] AMRAD Active LF Antenna

[Larry Kayser]

Frank:

First, Thank You for your work in this area, it is important and will help
many of us to go farther.

I have been studying your article and I see three items.

The first is the commercial for LF and that is good and I hope that the
announcement for the LF bands in the USA will come soon now.

The second and third items are the LF Preamp and the Packaging of the LF
preamp.  I see these as two distinct items, not necessarily related - let me
explain.

The second item is the Packaging.  The packaging is related not to the
design of the preamp but to the environmental application that is possibly
unique to your residential area.  The issues are to package the preamp with
adequate heatsink for the FET and to make the system waterproof.

The third is the PreAmp Design.  This design is not dependent on the
packaging and standard construction techniques are adequate for the project.
The issues, for me in this area, are keeping the weather out of the preamp
and feeding the preamp through in my case either an 850 ft feedline or one
of just over 2000 ft.  I will use a 48V DC battery supply regulated to 24V
at the far end of the feedline.

If I have disassembled the article correctly please let me know.   I am
especially interested in finding out now before I start hacking the issues
if I have missed anything that might impact the performance of the unit.  My
antenna will be 6 ft above water level and have 6.5 miles of open water in
the direction of Europe and 2.5 miles of open water to ZL/VK.  Regretfully
the water is fresh water and not salt water - but you can't have everything
I am told hi.

Your comments will be appreciated.

Larry
VA3LK