12/27/2013 New manual / schematic, new balun cores used for inductors
05/06/2012 - 530 kHz lowpass filter components now included
select either the LF Convert kit alone OR the LF Converter with the extra filter components , then press the add to cart button
There is some corrosion on the board plating, it is unsightly but doesn't affect performance.
Suggestion from a customer: use a brass brush to shine up the bottom traces before soldering.
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) + shipping/handling
05/06/12: 3 capacitors and a resistor are now included with the kit for a higher cutoff filter (see the mod section at the end of the manual)
add $3 for additional
filter components (see the mod section at the end of the manual) designed by Jack Smith in his review
12/27/2013: note that the extra filter components now have BN-61-2402 balun cores and smaller magnet wire
12/25/2010: also note that per Jack Smith, his web page may not be viewable by folks in Europe, please email
if you'd like me to email a pdf file of Jack's review.
(Right click/save target as)
and print the current manual and
For kits purchased before December 27, 2013
here are the older manual and
schematic. Also, the older update notes which used to be included with the kit.
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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.)
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.