06/25/2010 - back in stock, thanks for waiting
There is some corrosion on the board plating, I don't think it should be a problem but I am following up with the board vendor.
The board has been changed slightly and the coils maybe either
prewound binocular cores OR FT37-61 toroids with magnet wire (you wind) so the kit will not look exactly like
the picture.
LF Converter kit
![[LF Converter circuit board picture - click for larger view of board ]](lfconv5sm.jpg)
LF band (10 to 300 kHz) upconverted to HF
use with your HF ham radio OR shortwave receiver
all board mounted parts supplied
just add your metal case, connectors
price is $14 for basic kit (4 AND 10 MHz crystals, no printed documentation)
add $3 for additional
filter components designed by Jack Smith in his review
11/10/2009: note that the extra filter components now have FT37-61 cores and smaller magnet wire versus the original FT50-61 and #22 wire
add $3 for postage/handling in USA
add $6 for postage/handling worldwide
Printed manuals available for an additional charge or save money by downloading
(Right click/save target as)
and printing the manual and
schematic. Also, these update notes are included with the kit.
Print out the Kit
order form to figure your order manually
OR try our: javascript order form
to let your browser do the math
OR press one of the buttons below to pay with a credit card by using Paypal:
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For larger quantity purchases by Paypal or any questions, please email:
wb9kzy at wb9kzy dot com
with the quantity desired and a Paypal invoice will be emailed back to you.
Downloadable files for LF Converter
The Acrobat files of complex diagrams (like the schematic) may not
view well on your computer screen - suggestion: use the magnifier to zoom in
for better detail or print out the file.
(Right click any link below, then select "save target as" to save the file to your PC.)
lfconv4m.pdf (16k) - an Acrobat file of the LF Converter manual
lfconv4.pdf (69k) - an Acrobat file of the LF Converter schematic
The following files were recorded with an Elecraft K2 on
40 meters fed by an LF Converter - recordings made 5/3/2002 in the early afternoon (1:45 to 2:15 PM) local time using a 70 foot wire antenna, 15 feet above ground, location: Washington Island, WI.
24khzx.wav (39k) - a .WAV sound file of the 24 KHz Military station
wwvbx.wav (61k) - a .WAV sound file of WWVB at 60 KHz
loranx.wav (20k) - a .WAV sound file of Loran pulses at 100 KHz
atx.wav (17k) - a .WAV sound file of the AT beacon at 228.87 KHz
dgpsx.wav (33k) - a .WAV sound file of the Sturgeon Bay, WI DGPS stations at 321.9 KHz
LF web links:
K0LR - Lyle Kohler's terrific web site
LWCA - Long Wave Club of America web site
Page accesses: 
![[LF Converter circuit board picture - click for larger view of board ]](lfconv5a.jpg)