Digital readout for the original TS-520 by Mark Mohrmann, WA2FXM

Mark has written up a terrific document detailing how he added the Digital Display to his non “S”  TS-520.  There was a kit for the TS-520 back in the day to add the CAR/VFO/HET signal outputs, the TS-520S came with this option built in. Mark details how he built the interface, including the buffer amp necessary for the HET signal.  Thanks Mark!

4 thoughts on “Digital readout for the original TS-520 by Mark Mohrmann, WA2FXM

    1. admin Post author

      Not sure what you’re asking. Has it been tested with who’s VFO? My VFO? It’s a frequency display – not a VFO.


  1. Stevie Plevin

    When I initially commented I clicked the -Notify me when new feedback are added- checkbox and now every time a comment is added I get four emails with the identical comment. Is there any way you possibly can remove me from that service? Thanks!

    1. admin Post author

      Huh! I have no idea why that is happening, I’ll see if there is a way to remove you. I don’t see the e-mail address listed on the subscribed list – is there another e-mail address you used? You can e-mail me at


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