[R-390] VLF question

[Marshall M. Dues]

I saw something on the following web site regarding VLF.  He uses a 
240uH loopstick and a 13 to 400 pF variable broadcast capacitor with a 
six position switch that places from 390 to 1800 pF fixed capacitors 
across the broadcast variable to resonate in the VLF spectrum.

Visit KE9OA's Shortwave Receivers and Other Cool Stuff at:

http://home.att.net/~n.gianakopoulos/wsb/html/view.cgi-home.html-.html

http://home.att.net/~n.gianakopoulos/html/active_multiband_loopstick.pdf

Regards,

Marshall Dues,  WB5MYO

Katy, Texas



Bryce Ringwood wrote:

> No R 398 :(.  Planning to use a sound card with a tuned filter ahead of
> the microphone input + software. Dumb question - how does one set about
> winding the VLF coils - ? Are they just pile wound on a transformer core
> (leaving an air gap) like a power supply choke, or are they just like MW
> universal windings with lots of turns what do members suggest ? What do
> radios like the R 398 use ? 
> 
> Sorry for the simple questions, but I suffer from dark ignorance
> concerning VLF. Don't even know if VLF from Grimeton will cross the
> equator. - Bryce
>