Ham Radio KITS - TOP PAGE - Washington Island BOOKS

LF Converter kit

12/27/2013 New manual / schematic, new balun cores used for inductors

05/06/2012 - 530 kHz lowpass filter components now included

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 Converter circuit board picture - click for larger view of board ]

  • 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)
  • 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 wb9kzy at wb9kzy dot com if you'd like me to email a pdf file of Jack's review.
  • add $3 for postage/handling in USA
  • add another $7 for postage/handling worldwide = $10 total


  • 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
    OR press one of the buttons below to pay with a credit card by using Paypal:


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    press the Add to cart button at the left to add the LF Converter with the extra filter components
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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.)

    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

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