LF Converter kit
June 25, 2024: back in stock, thanks for waiting
June 26, 2019: board supplied is now silk screened / solder masked
12/27/2013 New manual / schematic, new balun cores used for inductors
05/06/2012 - 530 kHz lowpass filter components now included
Need other parts to complete your kit ? Please see the: switch and parts page
On boards supplied prior to June 25th 2019 there is some unsightly board plating, it doesn't affect performance.
Suggestion from a customer: use a brass brush to shine up the bottom traces before soldering.
![[LF Converter circuit board picture - click for larger view of board ]](lf 1-2-14a.jpg)
LF band (10 to 300 kHz) upconverted to HF (covers 2200 meter, 135.7 to 137.8 kHz ham band)
with the included optional parts also covers the 630 meter, 472 to 479 kHz ham band
use with your HF ham radio OR shortwave receiver
all board mounted parts supplied
just add your metal case, connectors
price is $15 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.
download
(Right click/save target as)
and print the current manual and
schematic.
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.
Print out the Kit
order form to figure your order manually
OR try our: javascript order form
to let your browser do the math
For any questions, please email:
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.)
For current kits here are the latest docs:
lfconv5.pdf - an Acrobat file of the LF Converter manual
lfconv5s.pdf - an Acrobat file of the LF Converter schematic
For kits purchased before December 27, 2013
here are the older docs:
lfconv4m.pdf (16k) - an Acrobat file of the LF Converter manual
lfconv4.pdf (69k) - an Acrobat file of the LF Converter schematic
lfconv5a.jpg - a picture of the old LF Converter board
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 - A backup of Lyle Kohler's (K0LR) terrific web site
LWCA - Long Wave Club of America web site
Page accesses: 
